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Nadhir Hammami

University of Jendouba Tunisia, Biological Sciences of Sportive and Physical Activities, Associate Professor

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An Assistant professor, Teacher-researcher in field of Biomechanics of Human Movement (Normal, Sportive and Deficient), Neurorehabilitation by Physical and Sport Activities using Kinetic devices (Isokinetic), Sport Training and Assessment..

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Papers by Nadhir Hammami

Developing normative values and predictive models for the 6-minute walk test across diverse adolescent developmental stages

European Journal of Sport Science, 2024

The six-minute walking test (6MWT) is commonly used to measure functional capacity in field setti... more The six-minute walking test (6MWT) is commonly used to measure functional capacity in field settings, primarily through the distance covered. This study aims to establish reference curves for the six-minute walking distance (6MWD) and peak heart rate (PHR) and develop a predictive equation for cardiovascular capacity in Tunisian children and adolescents. A total of 1501 participants (706 boys and 795 girls), aged 10–18 years, were recruited from schools in Tunisia. The Lambda (L), Mu (M), and Sigma (S) methods (LMS method) were employed to develop smoothed percentile curves for 6MWD and PHR. Multivariate linear regression was utilized to formulate a prediction equation for 6MWD. Smoothed percentiles (3rd, 10th, 25th, 50th, 75th, 90th, and 97th) for 6MWD and PHR were presented with age. All variables showed a strong positive correlation (p < 0.001) with a six-minute walking distance (r ranged from 0.227 to 0.558 for girls and from 0.309 to 0.610 for boys), except resting heart rate, which showed a strong negative correlation (girls: r = −0.136; boys: r = −0.201; p < 0.001). Additionally, PHR showed a weak correlation (p > 0.05). The prediction equations, based on age as the primary variable, were established for both genders. For boys: 6MWD = 66.181 + 38.142 × Age (years) (R2 = 0.372; Standard Error of Estimate (SEE) = 122.13), and for girls: 6MWD = 105.535 + 28.390 × Age (years) (R2 = 0.312; SEE = 103.66). The study provides normative values and predictive equations for 6MWD and PHR in Tunisian children and adolescents. These findings offer essential tools for identifying, monitoring, and interpreting cardiovascular functional deficits in clinical and research settings.

Examining the Link between Isokinetic Strength Metrics and Ball Speed in Women’s Soccer

by Nadhir Hammami and Cengiz Ölmez

Applied Sciences

The shot performance of female soccer players is one of the most critical factors in winning a so... more The shot performance of female soccer players is one of the most critical factors in winning a soccer match. It is essential to thoroughly clarify the kinetic factors that can improve shot performance. This study explores the connections between ball velocity post-shooting and isokinetic knee extension (EXT) and flexion (FLX) strength performances among female soccer players. Thirteen voluntary players from professional leagues took part in the research study. The study analyzed the average and peak concentric (Con) and eccentric (Ecc) torques, isometric (Iso) strength performances at angular velocities of 60°/s, 180°/s and 300°/s, the time required to reach peak torque, and ball velocities during shooting. The relationships among these variables were investigated separately for the dominant (D) and non-dominant (ND) legs. The analysis unveiled significant correlations between ball velocities and D-EXT (Absolute) peak torque at an angular velocity of 60°/s (r = 0.597; p < 0.05), ...

Concentric Isokinetic Strengthening Program’s Impact on Knee Biomechanical Parameters, Physical Performance and Quality of Life in Overweight/Obese Women with Chronic Meniscal Lesions

by Nadhir Hammami and amani mechraoui

Healthcare

Meniscal injuries are one of the most common intra-articular knee injuries. Different treatments ... more Meniscal injuries are one of the most common intra-articular knee injuries. Different treatments are presented depending on the symptoms and duration of meniscus tears, such as arthroscopic partial meniscectomy, physiotherapy, or even pharmacological treatment. The purpose was to investigate the effect of a concentric isokinetic knee muscle strengthening program on strength, joint range of motion, physical performance, quality of life and pain tolerance in overweight/obese women with chronic meniscal lesions. Twenty-four overweight/obese women were randomized into two groups. A control group (CG) performed a usual rehabilitation program plus isokinetic muscle strengthening (IMS) in the continuous passive motion mode and measured with an isokinetic dynamometer. An experimental group (EG) performed the same program in combination with IMS in the isokinetic active mode. The peak torque of the knee extensors (PTE) and flexors (PTF), sit-to-stand test, stair climb test, joint amplitude, ...

Influence of muscle volume on jumping performance in healthy male and female youth and young adults

BMC Sports Science, Medicine and Rehabilitation

Background Sex differences that appear throughout puberty have a substantial impact on the traini... more Background Sex differences that appear throughout puberty have a substantial impact on the training process. It remains unclear what effect these sex differences should have on how training programs are planned and performed and what objectives should be established for boys and girls of different ages. This study aimed to investigate the relationship between vertical jump performance and muscle volume based on age and sex. Methods One hundred eighty healthy males (n = 90) and females (n = 90) performed three different types of vertical jumps (VJ): squat jump (SJ), counter movement jump (CMJ), and counter movement jump with arms (CMJ with arms). We used the anthropometric method to measure muscle volume. Results Muscle volume differed across age groups. There were significant effects of age, sex, and their interaction on the SJ, CMJ, and CMJ with arms heights. From the age of 14–15, males exhibited better performances than females, and large effect sizes became apparent in the SJ (d...

Chronic Non-communicable Diseases, Pain, and Coping Strategies: An Overview

The Open Sports Sciences Journal, Nov 15, 2022

Around the world, chronic diseases have impacted the health and quality of life of many individua... more Around the world, chronic diseases have impacted the health and quality of life of many individuals. These chronic non-communicable diseases (NCDs), such as cancer, diabetes, cardiovascular disorders, and lung disease, are expensive to treat, frequently require lifelong care, and worsen drastically if treatment is postponed or of poor quality. This phenomenon will place pressure on healthcare systems to adjust to meet these evolving demands by creating efficient preventive strategies. One of the key epidemiological trends of the current times is the rise of chronic and degenerative diseases. This study will provide an overview of chronic diseases and helps to provide a more detailed image of pain and coping strategies. This requires adapting health systems and health policies and a shift from disease-centered to people-centered approaches and population health measures.

Effects of Muscle Volume on the Jumping Performance in Males and Females

Background A signi cant impact on the training process is caused by sex-speci c differences that ... more Background A signi cant impact on the training process is caused by sex-speci c differences that emerge throughout puberty. However, it is still unclear what impact this should have on how training programs are planned, implemented, and set goals for boys and girls of different ages. Purpose To study the relationship between vertical jump performance and muscle volume, considering age and sex factors. Methods healthy male and 90 healthy female participants (aged 9 to 22 years) performed three different types of vertical jumps: squat jump, counter movement jump without and with arm swings. A standard Anthropometric method was used to measure the muscle volume. Results Muscle volume was different across age groups. For both sexes in the Squat Jump, Counter Movement Jump, and Counter Movement Jump arms, signi cant age, sex, and interaction effects were found. From the age of 14-15, Males performed signi cantly better than females (p = 0.001). These differences persisted when performances were normalized to the length of lower limbs'. Following normalization to muscle volume males elicited better performance when compared to females. This difference persisted only for the 20-22 age group in Squat Jump (p = 0.005), Counter Movement Jump (p = 0.022) and in Counter Movement Jump with arms (p = 0.016). Signi cant correlation occurred between Muscle Volume and Squat Jump (r = 0.70; p < 0.01), Counter Movement Jump (r = 0.70; p < 0.01) and Counter Movement Jump with arms (r = 0.55; p < 0.01) for male participants. Conclusions The muscle volume appeared to be the determining factor in intersexual differences in vertical jumping performances.

Comparison of the Physical, Physiological, and Psychological Responses of the High-Intensity Interval (HIIT) and Small-Sided Games (SSG) Training Programs in Young Elite Soccer Players

International Journal of Environmental Research and Public Health

We investigated the effects of high-intensity interval (HIIT) and small-sided games (SSG) trainin... more We investigated the effects of high-intensity interval (HIIT) and small-sided games (SSG) training programs on physiological and psychological responses in young soccer players. Twenty-four male soccer players (age 16.7 ± 0.9 years) were divided into two groups (HIIT and SSG) and completed a 6-week training programs consisting of two training sessions a week. HIIT consisted of intermittent runs lasting 15 s at the 110% maximum aerobic speed followed by a passive recovery lasting 15 s; SSG was instead structured in a 4 versus 4 players games on a playing field of 25 × 35 m. The muscular power of the lower body was assessed before and after each training session using the 5-jump test to leg length, and two incremental field tests (VAMEVAL test and modified agility t-test). Our results show that HIIT and SSG have similar beneficial effects on the variables connected to the soccer-specific performance and the endurance with little influence on neuromuscular performances. Psychological r...

Isokinetic strengthening and neuromuscular electrical stimulation protocol impact on physical performances, functional status and quality of life in knee osteoarthritis overweight/obese women

The Knee

Motor and coordination deficits of hemiplegic upper limb : diagnosis and rehabilitation by the isokinetic

La restauration fonctionnelle du membre supérieur chez l'hémiplégique séquellaire reste toujo... more La restauration fonctionnelle du membre supérieur chez l'hémiplégique séquellaire reste toujours l'objectif primordial recherché durant le processus de réhabilitation. De nos jours, les techniques émergentes de rééducation montrent de plus en plus d'efficacité et de réalisme, si elles sont accompagnées par les techniques conventionnelles et classiques. De plus, quelques idées anciennes ont évoluées vers l'utilisation du renforcement musculaire du membre atteint afin d'améliorer sa fonction motrice. En effet, le renforcement musculaire isocinétique constitue une technique potentiellement intéressante de rééducation pour des hémiplégiques. Dans le cadre de notre travail doctoral, nous avons utilisé le concept isocinétique pour réhabiliter les déficits moteurs et diagnostiquer les déficits de coordination du membre supérieur hémiplégique. En premier lieu, nous avons essayé de montrer le rôle de l'isocinétisme pour optimiser la prise en charge du membre supérieur...

The relationship between lower limb muscle volume and body mass in ambulant individuals with bilateral cerebral palsy

BMC neurology, Jan 29, 2017

Individuals with cerebral palsy have smaller muscle volumes normalised to body mass than their ty... more Individuals with cerebral palsy have smaller muscle volumes normalised to body mass than their typically developing peers. The aim of this study is to investigate the relationship between lower limb muscle volume and body mass in young people with bilateral cerebral palsy and their typically developing peers. Twenty-five participants with bilateral cerebral palsy (aged 14.7±3.0 years, GMFCS level I-III) and 25 of their typically developing peers (aged 16.8±3.3 years) took part in this study. None of the participants had undergone orthopaedic surgery, botulinum toxin injections, or serial casting in the previous year. All participants underwent magnetic resonance imaging of both lower limbs. Nine major muscles of each lower limb were individually manually segmented and the muscle volumes calculated. Body mass and total lower limb muscle volume were significantly linearly related in both the cerebral palsy (R = 0.75, p<0.001) and typically developing (R = 0.77, p<0.001) groups. ...

Combat sport injuries profile: A review

Science & Sports, 2018

Objectives.-The purpose of this review is to provide an overview of the injury location, injury d... more Objectives.-The purpose of this review is to provide an overview of the injury location, injury diagnosis, injury risk factors and injury prevention among practitioners of different combat sports. News.-This review was conducted using databases of MEDLINE (via Pubmed), Science Direct, Scopus and Google Scholar. The studies concerned were classified according to the nature of the combat sports and the type of the injury by three authors using the titles, abstracts and full texts if available. Data from different observational studies suggest that there is a significant injury problem in combat sport in general because the main goal of the practitioners is to strike and/or to project opponent with maximal power and speed in order to win. This exposes them to permanent risk of injuries, which limit usually training effects, provoke disability conditions with competitiveness loss and often ruin their careers. However, it varies considerably across different styles. Researchers used retrospective and prospective method to explore specificity of injury but little is known about the actual severity of injuries in combat sports. Prospects and projects.-Future studies are highly encouraged to adopt stronger methodologies. The long-term consequences of injuries, a detailed balance sheet by nature of injury and specific preventive strategies are needed to support the findings presented in this review. Conclusion.-In this review, a preliminary injury profiles in combat sports was established containing location and types of injuries. Compared to other sports, combat sports are no more dangerous especially for beginner practitioners.

COVID-19 Pandemic: Physical Activity as Prevention Mean

The Open Sports Sciences Journal, 2020

Background: The consequences of the new pandemic caused by the Coronavirus Disease 2019 (COVID-19... more Background: The consequences of the new pandemic caused by the Coronavirus Disease 2019 (COVID-19) have ruined the whole world. To date, more than 180 countries have been affected with more than 13 million people afflicted of all categories (young people, the elderly, athletes, and children) and more than 500,000 deaths around the globe. Moderate-intensity physical activity should be recommended as a non-pharmacological, low-cost, and feasible mean to cope with the COVID-19 virus Objective: The first objective is to provide an overview of the COVID-19 pandemic along with the evolution of this disease, the modes of inter-persons transmission, and the symptoms. The second objective is to suggest means of prevention for people, including the practice of regular physical activity. Conclusion: No drugs or treatments exist until today. The solution remains confinement in order to minimize contact between people (social distancing) and the strengthening of the immune system through a healt...

Déficit de coordination bimanuelle après AVC : le rôle des réafférences sensorielles

Annals of Physical and Rehabilitation Medicine, 2012

Physical Training in Taekwondo: Generic and Specific Training

Speci c functional and physical preparations for task requirements are important to develop TKD t... more Speci c functional and physical preparations for task requirements are important to develop TKD technical skills. In this context, the use of TKD skills has been shown to improve the physical level of TKD athletes. erefore, it is then recommended to include TKD skills in traditional physical methods to prepare TKD athlete to cope with the metabolic and physiological demands of TKD competition. It is important to note that performing TKD skills without a speci c integrated physical goal appears not enough to improve all TKD tness components. e present chapter details the speci c and generic physical training of TKD modalities performed in competition form.

Time Motion and Technical and Tactical Analysis of Taekwondo Competition

A considerable amount of studies has been devoted for establishing the need of an objective form ... more A considerable amount of studies has been devoted for establishing the need of an objective form of analysis and its importance in the coaching and the prescription of the training process. While some methodological approaches did not present a good way for giving realistic data from the competition, the match analysis (time motion and technical and tactical analysis) presents a good method that allows coaches/ tness coaches to obtain data from o cial competitive Taekwondo (TKD) matches. e chapter presents a model for analyzing TKD competitions and describes the temporal, technical and tactical pro le of TKD competitions taking into account several variables (e.g., combat stage, weight categories, tournaments level and gender).

Physical Training in Taekwondo: Generic and Specific Training

Speci c functional and physical preparations for task requirements are important to develop TKD t... more Speci c functional and physical preparations for task requirements are important to develop TKD technical skills. In this context, the use of TKD skills has been shown to improve the physical level of TKD athletes. erefore, it is then recommended to include TKD skills in traditional physical methods to prepare TKD athlete to cope with the metabolic and physiological demands of TKD competition. It is important to note that performing TKD skills without a speci c integrated physical goal appears not enough to improve all TKD tness components. e present chapter details the speci c and generic physical training of TKD modalities performed in competition form.

Isokinetic program in stroke survivors with chronic upper limb hemiparesis

Annals of Physical and Rehabilitation Medicine, 2011

Physical and Rehabilitation Medicine 54S (2011) e131-e147 was shown between the two groups for ga... more Physical and Rehabilitation Medicine 54S (2011) e131-e147 was shown between the two groups for gait velocity, step length, step width, or simple support time. Conclusion.-It seems that quantified gait parameters are not relevant evaluation criteria to assess the efficiency of a treatment with botulinum toxin type A. This evaluation must be done using satisfaction scales fulfilled by the patient, linked with therapeutic objectives that are well specified before the treatment, with the PRM doctor.

Isokinetic program in stroke survivors with chronic upper limb hemiparesis

Annals of Physical and Rehabilitation Medicine, 2011

Physical and Rehabilitation Medicine 54S (2011) e131-e147 was shown between the two groups for ga... more Physical and Rehabilitation Medicine 54S (2011) e131-e147 was shown between the two groups for gait velocity, step length, step width, or simple support time. Conclusion.-It seems that quantified gait parameters are not relevant evaluation criteria to assess the efficiency of a treatment with botulinum toxin type A. This evaluation must be done using satisfaction scales fulfilled by the patient, linked with therapeutic objectives that are well specified before the treatment, with the PRM doctor.

COVID-19 Pandemic: Physical Activity as Prevention Mean

by Hela Jdidi and Nadhir Hammami

The Open Sports Sciences Journal, 2020

Background: The consequences of the new pandemic caused by the Coronavirus Disease 2019 (COVID-19... more Background:
The consequences of the new pandemic caused by the Coronavirus Disease 2019 (COVID-19) have ruined the whole world. To date, more than 180 countries have been affected with more than 13 million people afflicted of all categories (young people, the elderly, athletes, and children) and more than 500,000 deaths around the globe. Moderate-intensity physical activity should be recommended as a non-pharmacological, low-cost, and feasible mean to cope with the COVID-19 virus.

Objective:
The first objective is to provide an overview of the COVID-19 pandemic along with the evolution of this disease, the modes of inter-persons transmission, and the symptoms. The second objective is to suggest means of prevention for people, including the practice of regular physical activity.

Conclusion:
No drugs or treatments exist until today. The solution remains confinement in order to minimize contact between people (social distancing) and the strengthening of the immune system through a healthy lifestyle (healthy food and regular physical and sports practice) in addition to the recommended preventive measures.

Combat sport injuries profile: A review

by Nadhir Hammami and Taysir Rezgui

Objectives: The purpose of this review is to provide an overview of the injury location, injury d... more Objectives: The purpose of this review is to provide an overview of the injury location, injury diagnosis, injury risk factors and injury prevention among practitioners of different combat sports. News: This review was conducted using databases of MEDLINE (via Pubmed), Science Direct, Scopus and Google Scholar. The studies concerned were classified according to the nature of the combat sports and the type of the injury by three authors using the titles, abstracts and full texts if available. Data from different observational studies suggest that there is a significant injury problem in combat sport in general because the main goal of the practitioners is to strike and/or to project opponent with maximal power and speed in order to win. This exposes them to permanent risk of injuries, which limit usually training effects, provoke disability conditions with competitiveness loss and often ruin their careers. However, it varies considerably across different styles. Researchers used retrospective and prospective method to explore specificity of injury but little is known about the actual severity of injuries in combat sports. Prospects and projects: Future studies are highly encouraged to adopt stronger methodologies. The long-term consequences of injuries, a detailed balance sheet by nature of injury and specific preventive strategies are needed to support the findings presented in this review. Conclusion: In this review, a preliminary injury profiles in combat sports was established containing location and types of injuries. Compared to other sports, combat sports are no more dangerous especially for beginner practitioners.

Developing normative values and predictive models for the 6-minute walk test across diverse adolescent developmental stages

European Journal of Sport Science, 2024

The six-minute walking test (6MWT) is commonly used to measure functional capacity in field setti... more The six-minute walking test (6MWT) is commonly used to measure functional capacity in field settings, primarily through the distance covered. This study aims to establish reference curves for the six-minute walking distance (6MWD) and peak heart rate (PHR) and develop a predictive equation for cardiovascular capacity in Tunisian children and adolescents. A total of 1501 participants (706 boys and 795 girls), aged 10–18 years, were recruited from schools in Tunisia. The Lambda (L), Mu (M), and Sigma (S) methods (LMS method) were employed to develop smoothed percentile curves for 6MWD and PHR. Multivariate linear regression was utilized to formulate a prediction equation for 6MWD. Smoothed percentiles (3rd, 10th, 25th, 50th, 75th, 90th, and 97th) for 6MWD and PHR were presented with age. All variables showed a strong positive correlation (p < 0.001) with a six-minute walking distance (r ranged from 0.227 to 0.558 for girls and from 0.309 to 0.610 for boys), except resting heart rate, which showed a strong negative correlation (girls: r = −0.136; boys: r = −0.201; p < 0.001). Additionally, PHR showed a weak correlation (p > 0.05). The prediction equations, based on age as the primary variable, were established for both genders. For boys: 6MWD = 66.181 + 38.142 × Age (years) (R2 = 0.372; Standard Error of Estimate (SEE) = 122.13), and for girls: 6MWD = 105.535 + 28.390 × Age (years) (R2 = 0.312; SEE = 103.66). The study provides normative values and predictive equations for 6MWD and PHR in Tunisian children and adolescents. These findings offer essential tools for identifying, monitoring, and interpreting cardiovascular functional deficits in clinical and research settings.

Examining the Link between Isokinetic Strength Metrics and Ball Speed in Women’s Soccer

by Nadhir Hammami and Cengiz Ölmez

Applied Sciences

The shot performance of female soccer players is one of the most critical factors in winning a so... more The shot performance of female soccer players is one of the most critical factors in winning a soccer match. It is essential to thoroughly clarify the kinetic factors that can improve shot performance. This study explores the connections between ball velocity post-shooting and isokinetic knee extension (EXT) and flexion (FLX) strength performances among female soccer players. Thirteen voluntary players from professional leagues took part in the research study. The study analyzed the average and peak concentric (Con) and eccentric (Ecc) torques, isometric (Iso) strength performances at angular velocities of 60°/s, 180°/s and 300°/s, the time required to reach peak torque, and ball velocities during shooting. The relationships among these variables were investigated separately for the dominant (D) and non-dominant (ND) legs. The analysis unveiled significant correlations between ball velocities and D-EXT (Absolute) peak torque at an angular velocity of 60°/s (r = 0.597; p < 0.05), ...

Concentric Isokinetic Strengthening Program’s Impact on Knee Biomechanical Parameters, Physical Performance and Quality of Life in Overweight/Obese Women with Chronic Meniscal Lesions

by Nadhir Hammami and amani mechraoui

Healthcare

Meniscal injuries are one of the most common intra-articular knee injuries. Different treatments ... more Meniscal injuries are one of the most common intra-articular knee injuries. Different treatments are presented depending on the symptoms and duration of meniscus tears, such as arthroscopic partial meniscectomy, physiotherapy, or even pharmacological treatment. The purpose was to investigate the effect of a concentric isokinetic knee muscle strengthening program on strength, joint range of motion, physical performance, quality of life and pain tolerance in overweight/obese women with chronic meniscal lesions. Twenty-four overweight/obese women were randomized into two groups. A control group (CG) performed a usual rehabilitation program plus isokinetic muscle strengthening (IMS) in the continuous passive motion mode and measured with an isokinetic dynamometer. An experimental group (EG) performed the same program in combination with IMS in the isokinetic active mode. The peak torque of the knee extensors (PTE) and flexors (PTF), sit-to-stand test, stair climb test, joint amplitude, ...

Influence of muscle volume on jumping performance in healthy male and female youth and young adults

BMC Sports Science, Medicine and Rehabilitation

Background Sex differences that appear throughout puberty have a substantial impact on the traini... more Background Sex differences that appear throughout puberty have a substantial impact on the training process. It remains unclear what effect these sex differences should have on how training programs are planned and performed and what objectives should be established for boys and girls of different ages. This study aimed to investigate the relationship between vertical jump performance and muscle volume based on age and sex. Methods One hundred eighty healthy males (n = 90) and females (n = 90) performed three different types of vertical jumps (VJ): squat jump (SJ), counter movement jump (CMJ), and counter movement jump with arms (CMJ with arms). We used the anthropometric method to measure muscle volume. Results Muscle volume differed across age groups. There were significant effects of age, sex, and their interaction on the SJ, CMJ, and CMJ with arms heights. From the age of 14–15, males exhibited better performances than females, and large effect sizes became apparent in the SJ (d...

Chronic Non-communicable Diseases, Pain, and Coping Strategies: An Overview

The Open Sports Sciences Journal, Nov 15, 2022

Around the world, chronic diseases have impacted the health and quality of life of many individua... more Around the world, chronic diseases have impacted the health and quality of life of many individuals. These chronic non-communicable diseases (NCDs), such as cancer, diabetes, cardiovascular disorders, and lung disease, are expensive to treat, frequently require lifelong care, and worsen drastically if treatment is postponed or of poor quality. This phenomenon will place pressure on healthcare systems to adjust to meet these evolving demands by creating efficient preventive strategies. One of the key epidemiological trends of the current times is the rise of chronic and degenerative diseases. This study will provide an overview of chronic diseases and helps to provide a more detailed image of pain and coping strategies. This requires adapting health systems and health policies and a shift from disease-centered to people-centered approaches and population health measures.

Effects of Muscle Volume on the Jumping Performance in Males and Females

Background A signi cant impact on the training process is caused by sex-speci c differences that ... more Background A signi cant impact on the training process is caused by sex-speci c differences that emerge throughout puberty. However, it is still unclear what impact this should have on how training programs are planned, implemented, and set goals for boys and girls of different ages. Purpose To study the relationship between vertical jump performance and muscle volume, considering age and sex factors. Methods healthy male and 90 healthy female participants (aged 9 to 22 years) performed three different types of vertical jumps: squat jump, counter movement jump without and with arm swings. A standard Anthropometric method was used to measure the muscle volume. Results Muscle volume was different across age groups. For both sexes in the Squat Jump, Counter Movement Jump, and Counter Movement Jump arms, signi cant age, sex, and interaction effects were found. From the age of 14-15, Males performed signi cantly better than females (p = 0.001). These differences persisted when performances were normalized to the length of lower limbs'. Following normalization to muscle volume males elicited better performance when compared to females. This difference persisted only for the 20-22 age group in Squat Jump (p = 0.005), Counter Movement Jump (p = 0.022) and in Counter Movement Jump with arms (p = 0.016). Signi cant correlation occurred between Muscle Volume and Squat Jump (r = 0.70; p < 0.01), Counter Movement Jump (r = 0.70; p < 0.01) and Counter Movement Jump with arms (r = 0.55; p < 0.01) for male participants. Conclusions The muscle volume appeared to be the determining factor in intersexual differences in vertical jumping performances.

Comparison of the Physical, Physiological, and Psychological Responses of the High-Intensity Interval (HIIT) and Small-Sided Games (SSG) Training Programs in Young Elite Soccer Players

International Journal of Environmental Research and Public Health

We investigated the effects of high-intensity interval (HIIT) and small-sided games (SSG) trainin... more We investigated the effects of high-intensity interval (HIIT) and small-sided games (SSG) training programs on physiological and psychological responses in young soccer players. Twenty-four male soccer players (age 16.7 ± 0.9 years) were divided into two groups (HIIT and SSG) and completed a 6-week training programs consisting of two training sessions a week. HIIT consisted of intermittent runs lasting 15 s at the 110% maximum aerobic speed followed by a passive recovery lasting 15 s; SSG was instead structured in a 4 versus 4 players games on a playing field of 25 × 35 m. The muscular power of the lower body was assessed before and after each training session using the 5-jump test to leg length, and two incremental field tests (VAMEVAL test and modified agility t-test). Our results show that HIIT and SSG have similar beneficial effects on the variables connected to the soccer-specific performance and the endurance with little influence on neuromuscular performances. Psychological r...

Isokinetic strengthening and neuromuscular electrical stimulation protocol impact on physical performances, functional status and quality of life in knee osteoarthritis overweight/obese women

The Knee

Motor and coordination deficits of hemiplegic upper limb : diagnosis and rehabilitation by the isokinetic

La restauration fonctionnelle du membre supérieur chez l'hémiplégique séquellaire reste toujo... more La restauration fonctionnelle du membre supérieur chez l'hémiplégique séquellaire reste toujours l'objectif primordial recherché durant le processus de réhabilitation. De nos jours, les techniques émergentes de rééducation montrent de plus en plus d'efficacité et de réalisme, si elles sont accompagnées par les techniques conventionnelles et classiques. De plus, quelques idées anciennes ont évoluées vers l'utilisation du renforcement musculaire du membre atteint afin d'améliorer sa fonction motrice. En effet, le renforcement musculaire isocinétique constitue une technique potentiellement intéressante de rééducation pour des hémiplégiques. Dans le cadre de notre travail doctoral, nous avons utilisé le concept isocinétique pour réhabiliter les déficits moteurs et diagnostiquer les déficits de coordination du membre supérieur hémiplégique. En premier lieu, nous avons essayé de montrer le rôle de l'isocinétisme pour optimiser la prise en charge du membre supérieur...

The relationship between lower limb muscle volume and body mass in ambulant individuals with bilateral cerebral palsy

BMC neurology, Jan 29, 2017

Individuals with cerebral palsy have smaller muscle volumes normalised to body mass than their ty... more Individuals with cerebral palsy have smaller muscle volumes normalised to body mass than their typically developing peers. The aim of this study is to investigate the relationship between lower limb muscle volume and body mass in young people with bilateral cerebral palsy and their typically developing peers. Twenty-five participants with bilateral cerebral palsy (aged 14.7±3.0 years, GMFCS level I-III) and 25 of their typically developing peers (aged 16.8±3.3 years) took part in this study. None of the participants had undergone orthopaedic surgery, botulinum toxin injections, or serial casting in the previous year. All participants underwent magnetic resonance imaging of both lower limbs. Nine major muscles of each lower limb were individually manually segmented and the muscle volumes calculated. Body mass and total lower limb muscle volume were significantly linearly related in both the cerebral palsy (R = 0.75, p<0.001) and typically developing (R = 0.77, p<0.001) groups. ...

Combat sport injuries profile: A review

Science & Sports, 2018

Objectives.-The purpose of this review is to provide an overview of the injury location, injury d... more Objectives.-The purpose of this review is to provide an overview of the injury location, injury diagnosis, injury risk factors and injury prevention among practitioners of different combat sports. News.-This review was conducted using databases of MEDLINE (via Pubmed), Science Direct, Scopus and Google Scholar. The studies concerned were classified according to the nature of the combat sports and the type of the injury by three authors using the titles, abstracts and full texts if available. Data from different observational studies suggest that there is a significant injury problem in combat sport in general because the main goal of the practitioners is to strike and/or to project opponent with maximal power and speed in order to win. This exposes them to permanent risk of injuries, which limit usually training effects, provoke disability conditions with competitiveness loss and often ruin their careers. However, it varies considerably across different styles. Researchers used retrospective and prospective method to explore specificity of injury but little is known about the actual severity of injuries in combat sports. Prospects and projects.-Future studies are highly encouraged to adopt stronger methodologies. The long-term consequences of injuries, a detailed balance sheet by nature of injury and specific preventive strategies are needed to support the findings presented in this review. Conclusion.-In this review, a preliminary injury profiles in combat sports was established containing location and types of injuries. Compared to other sports, combat sports are no more dangerous especially for beginner practitioners.

COVID-19 Pandemic: Physical Activity as Prevention Mean

The Open Sports Sciences Journal, 2020

Background: The consequences of the new pandemic caused by the Coronavirus Disease 2019 (COVID-19... more Background: The consequences of the new pandemic caused by the Coronavirus Disease 2019 (COVID-19) have ruined the whole world. To date, more than 180 countries have been affected with more than 13 million people afflicted of all categories (young people, the elderly, athletes, and children) and more than 500,000 deaths around the globe. Moderate-intensity physical activity should be recommended as a non-pharmacological, low-cost, and feasible mean to cope with the COVID-19 virus Objective: The first objective is to provide an overview of the COVID-19 pandemic along with the evolution of this disease, the modes of inter-persons transmission, and the symptoms. The second objective is to suggest means of prevention for people, including the practice of regular physical activity. Conclusion: No drugs or treatments exist until today. The solution remains confinement in order to minimize contact between people (social distancing) and the strengthening of the immune system through a healt...

Déficit de coordination bimanuelle après AVC : le rôle des réafférences sensorielles

Annals of Physical and Rehabilitation Medicine, 2012

Physical Training in Taekwondo: Generic and Specific Training

Speci c functional and physical preparations for task requirements are important to develop TKD t... more Speci c functional and physical preparations for task requirements are important to develop TKD technical skills. In this context, the use of TKD skills has been shown to improve the physical level of TKD athletes. erefore, it is then recommended to include TKD skills in traditional physical methods to prepare TKD athlete to cope with the metabolic and physiological demands of TKD competition. It is important to note that performing TKD skills without a speci c integrated physical goal appears not enough to improve all TKD tness components. e present chapter details the speci c and generic physical training of TKD modalities performed in competition form.

Time Motion and Technical and Tactical Analysis of Taekwondo Competition

A considerable amount of studies has been devoted for establishing the need of an objective form ... more A considerable amount of studies has been devoted for establishing the need of an objective form of analysis and its importance in the coaching and the prescription of the training process. While some methodological approaches did not present a good way for giving realistic data from the competition, the match analysis (time motion and technical and tactical analysis) presents a good method that allows coaches/ tness coaches to obtain data from o cial competitive Taekwondo (TKD) matches. e chapter presents a model for analyzing TKD competitions and describes the temporal, technical and tactical pro le of TKD competitions taking into account several variables (e.g., combat stage, weight categories, tournaments level and gender).

Physical Training in Taekwondo: Generic and Specific Training

Speci c functional and physical preparations for task requirements are important to develop TKD t... more Speci c functional and physical preparations for task requirements are important to develop TKD technical skills. In this context, the use of TKD skills has been shown to improve the physical level of TKD athletes. erefore, it is then recommended to include TKD skills in traditional physical methods to prepare TKD athlete to cope with the metabolic and physiological demands of TKD competition. It is important to note that performing TKD skills without a speci c integrated physical goal appears not enough to improve all TKD tness components. e present chapter details the speci c and generic physical training of TKD modalities performed in competition form.

Isokinetic program in stroke survivors with chronic upper limb hemiparesis

Annals of Physical and Rehabilitation Medicine, 2011

Physical and Rehabilitation Medicine 54S (2011) e131-e147 was shown between the two groups for ga... more Physical and Rehabilitation Medicine 54S (2011) e131-e147 was shown between the two groups for gait velocity, step length, step width, or simple support time. Conclusion.-It seems that quantified gait parameters are not relevant evaluation criteria to assess the efficiency of a treatment with botulinum toxin type A. This evaluation must be done using satisfaction scales fulfilled by the patient, linked with therapeutic objectives that are well specified before the treatment, with the PRM doctor.

Isokinetic program in stroke survivors with chronic upper limb hemiparesis

Annals of Physical and Rehabilitation Medicine, 2011

Physical and Rehabilitation Medicine 54S (2011) e131-e147 was shown between the two groups for ga... more Physical and Rehabilitation Medicine 54S (2011) e131-e147 was shown between the two groups for gait velocity, step length, step width, or simple support time. Conclusion.-It seems that quantified gait parameters are not relevant evaluation criteria to assess the efficiency of a treatment with botulinum toxin type A. This evaluation must be done using satisfaction scales fulfilled by the patient, linked with therapeutic objectives that are well specified before the treatment, with the PRM doctor.

COVID-19 Pandemic: Physical Activity as Prevention Mean

by Hela Jdidi and Nadhir Hammami

The Open Sports Sciences Journal, 2020

Background: The consequences of the new pandemic caused by the Coronavirus Disease 2019 (COVID-19... more Background:
The consequences of the new pandemic caused by the Coronavirus Disease 2019 (COVID-19) have ruined the whole world. To date, more than 180 countries have been affected with more than 13 million people afflicted of all categories (young people, the elderly, athletes, and children) and more than 500,000 deaths around the globe. Moderate-intensity physical activity should be recommended as a non-pharmacological, low-cost, and feasible mean to cope with the COVID-19 virus.

Objective:
The first objective is to provide an overview of the COVID-19 pandemic along with the evolution of this disease, the modes of inter-persons transmission, and the symptoms. The second objective is to suggest means of prevention for people, including the practice of regular physical activity.

Conclusion:
No drugs or treatments exist until today. The solution remains confinement in order to minimize contact between people (social distancing) and the strengthening of the immune system through a healthy lifestyle (healthy food and regular physical and sports practice) in addition to the recommended preventive measures.

Combat sport injuries profile: A review

by Nadhir Hammami and Taysir Rezgui

Objectives: The purpose of this review is to provide an overview of the injury location, injury d... more Objectives: The purpose of this review is to provide an overview of the injury location, injury diagnosis, injury risk factors and injury prevention among practitioners of different combat sports. News: This review was conducted using databases of MEDLINE (via Pubmed), Science Direct, Scopus and Google Scholar. The studies concerned were classified according to the nature of the combat sports and the type of the injury by three authors using the titles, abstracts and full texts if available. Data from different observational studies suggest that there is a significant injury problem in combat sport in general because the main goal of the practitioners is to strike and/or to project opponent with maximal power and speed in order to win. This exposes them to permanent risk of injuries, which limit usually training effects, provoke disability conditions with competitiveness loss and often ruin their careers. However, it varies considerably across different styles. Researchers used retrospective and prospective method to explore specificity of injury but little is known about the actual severity of injuries in combat sports. Prospects and projects: Future studies are highly encouraged to adopt stronger methodologies. The long-term consequences of injuries, a detailed balance sheet by nature of injury and specific preventive strategies are needed to support the findings presented in this review. Conclusion: In this review, a preliminary injury profiles in combat sports was established containing location and types of injuries. Compared to other sports, combat sports are no more dangerous especially for beginner practitioners.