Papers by Mohamed Souhaiel Chelly
Pediatric exercise science, 2024
Applied Sciences
This study sought to investigate the anthropometric traits and physical capabilities of team hand... more This study sought to investigate the anthropometric traits and physical capabilities of team handball players, categorized based on their playing positions. A total of 50 male players (age: 27.4 ± 4.2 years; body mass: 92.8 ± 14.2 kg; height: 1.87 ± 0.08 m; body mass index (BMI): 26.3 ± 3.3 kg/m2) were categorized as Backs (12), Wings (14), Pivots (14), and Goalkeepers (10). The measurements included squat jumps (SJs), countermovement jumps (CMJs), sprint timings over 15 and 30 m, upper and lower limb muscle volume, change-of-direction T-Half test performance, and Yo-Yo intermittent recovery test performance. Depending on the position, the largest differences were detected for 30 m sprint (ηp2 = 0.72), 15 m sprint (ηp2 = 0.71), T-Half test (ηp2 = 0.41), half squat (ηp2 = 0.35), and bicipital skinfold of a throwing arm (ηp2 = 0.34). Bicipital skinfold showed the highest number (three) of relevant (r > 0.5) relationships, especially in sprinting (sprint 15 m: r = 0.528; sprint 30 m...
International Journal of Sports Science & Coaching, Apr 4, 2022
This study examined the effects of 8-week combined plyometric exercise and high intensity running... more This study examined the effects of 8-week combined plyometric exercise and high intensity running training (combined training) on the performance fitness in male U17 handball players. Participants were randomly divided between experimental (E; n = 15; age: 16.5 ± 0.4 years) and control (C; n = 13; age: 16.7 ± 0.3 years) groups. The E group performed combined training (4 workshops) twice a week over 8 weeks. Each session lasted approximately 35 min. The C maintained regular in-season training. Before and after the combined training, both groups underwent repeated sprint ability (RSA), sprint performance (5m, 10m, 20m and 30m), change of direction test (Modified change-of-direction T-test (T-half)), vertical jump (squat jump (SJ), counter-movement jump (CMJ), counter-movement jump with aimed arms (CMJA)), horizontal jump (five-jump test (5JT)), strength (1-RM half squat), and 20-meter shuttle run. Group x time interaction showed significant increases on sprint performance ( p < 0.01, 8.6%; p < 0.001, 7.3%; p < 0.05, 6.9%; and p < 0.01, 8.9% over distances of 5m, 10m, 20m and 30m respectively) in E relative to C. The T-half also showed significant gains for E ( p < 0.05, 6.8%), as did vertical jumping ( p < 0.01, 32.7%; p < 0.001, 32.6% and p < 0.001, 23% for SJ, CMJ and CMJA respectively) and horizontal jumping ( p < 0.05, 13.3%) compared to C. Moreover, there were significant improvements of RSA and 20 m shuttle run in E compared to C. However, there were no significant differences in 1-RM half squat between groups. We conclude that the allocation of short periods of a combined training is effective in enhancing performance fitness and thus can be commended to male U17 Handball participants as a potentially useful component of their training.
Biology of Sport, 2022
This study investigated the effects of a ballistic training programme using an arm/shoulder speci... more This study investigated the effects of a ballistic training programme using an arm/shoulder specific strength device (ASSSD) on the upper body peak power (PP), muscle volume (MV) of the dominant arm and throwing velocity in junior handball players. Twenty-six players were randomly assigned to an experimental (EG = 15, age 17.6 ± 0.51 years) and control (CG = 11, age 17.36 ± 0.50 years) group. Over an 8-week inseason period, the EG performed a ballistic training programme (2 sessions/week) immediately before their normal team handball training. Both groups underwent tests on the ASSSD, which operates in consecutive accelerative and decelerative actions, for throwing characteristics determination. Peak power (PP), peak force (PF), peak velocity (PV), peak rate of power development (PRPD), muscle volume (MV), throwing velocity with runup, standing throw, and jump throw were also assessed before/after the training programme. The EG group showed significant post-training improvements in PP (52.50%-p < 0.001), PF (26.45%-p < 0.01) and PRPD (78.47%-p < 0.001) better than the CG (1.81, 0.67 and 1.64%, p > 0.05, respectively). There was also a post-training improvement in the velocity at PP (22.82%-p < 0.001) and PF (42.45%-p < 0.001) in the EG compared to the CG (4.18 and 8.53%, p > 0.05 respectively). There was a significant increase in acceleration at PP (51.50%-p < 0.01) and PF (69.67%-p < 0.001). MV increased (19.11%-p < 0.001) in the EG, with no significant change (3.34%-p = 0.84) in the CG. Finally, significant increases were obtained in the three throw types (3.1-6.21%, p < 0.05-< 0.001) in the EG compared to the CG. The additional ASSSD training protocol was able to improve muscle strength/volume and ball throwing velocity in junior handball players.
Medicine and Science in Sports and Exercise, 2001
Purpose: Although sprint performance undoubtedly involves muscle power, the stiffness of the leg ... more Purpose: Although sprint performance undoubtedly involves muscle power, the stiffness of the leg also determines sprint performance while running at maximal velocity. Results that include both of these characteristics have not been directly obtained in previous studies on human runners. We have therefore studied the link between leg power, leg stiffness, and sprint performance. Methods: The acceleration and maximal running velocity developed by 11 subjects (age 16 Ϯ 1) during a 40-m sprint were measured by radar. Their leg muscle volumes were estimated anthropometrically. Leg power was measured by an ergometric treadmill test and by a hopping test. Each subject executed a maximal sprint acceleration on the treadmill equipped with force and speed transducers, from which forward power was calculated. A hopping jump test was executed at 2 Hz on a force platform. Leg stiffness was calculated using the flight and contact times of the hopping test. Results: The treadmill forward leg power was correlated with both the initial acceleration (r ϭ 0.80, P Ͻ 0.01) and the maximal running velocity (r ϭ 0.73, P Ͻ 0.05) during track sprinting. The leg stiffness calculated from hopping was significantly correlated with the maximal velocity but not with acceleration. Conclusion: Although muscle power is needed for acceleration and maintaining a maximal velocity in sprint performance, high leg stiffness may be needed for high running speed. The ability to produce a stiff rebound during the maximal running velocity could be explored by measuring the stiffness of a rebound during a vertical jump.
In this study, the relationships between medicine ball explosive power tests, jump and handball t... more In this study, the relationships between medicine ball explosive power tests, jump and handball throwing velocity performance in team handball players were investigated. Explosive test was measured by a medicine ball throw. Specific explosive strength was evaluated by making 3 types of overarm throw: standing position, using an adapted chair (without run-up, T W), a 3-step running throw (T 3-Steps) and a jump shot (J S). The jump test (SJ, CMJ and FCMJ) were determined using the OptoJump. The medicine ball explosive power test was closely related to T 3-Steps. Significant relationships were observed between medicine ball explosive power tests and (J S) and (T W). The Medicine ball explosive power test is also positively related to vertical jump ability represented by Squat Jump (SJ) and Countermovement Jump (CMJ). The results suggest an association of the medicine ball explosive power tests to performance in throwing events.
Journal of Sports Medicine and Physical Fitness, Jun 1, 2018
This study assessed the validity of the handball-specific complex-test (HBCT) and two nonspecific... more This study assessed the validity of the handball-specific complex-test (HBCT) and two nonspecific field tests in professional elite handball athletes, using the match performance score (MPS) as the gold standard of performance. Thirteen elite male handball players (age: 27.4 ± 4.8 years; premier German league) performed the HBCT, the Yo-Yo Intermittent Recovery Test (Yo-Yo-IR1-test) and a repeated shuttle sprint ability (RSA) test at the beginning of pre-season training. The RSA results were evaluated in terms of best time (RSAbest), total time (RSATT) and fatigue decrement (RSAdec). Heart rates (HR) were assessed at selected times throughout all tests; the recovery HR was measured immediately post test (R0) and 10 minutes later (R10). The match performance score was based on various handball specific parameters (e.g., field goals, assists, steals, blocks, and technical mistakes) as seen during all matches of the immediately subsequent season (2015/2016). The parameters of run 1, run 2, and HR recovery at minutes 6 and 10 of the RSA test all showed a variance of more than 10% (range: 11-15%). However, the variance of scores for the Yo-Yo-IR1-test was much smaller (range: 1 - 7%). The resting HR (r2=0.18), HR recovery at minute 10 (r2=0.10), lactate concentration at rest (r2=0.17), recovery of heart rate from 0 to 10 minutes (r2=0.15), and velocity of second throw at first trial (r2=0.37) were the most valid HBCT parameters. Much effort is necessary to assess MPS and to develop valid tests. Speed and the rate of functional recovery seem the best predictors of competitive performance for elite handball players.
Frontiers in Physiology, Jul 6, 2023
Purpose: This study aimed to investigate the effect of re-warm-up (RWUP) activities consisting of... more Purpose: This study aimed to investigate the effect of re-warm-up (RWUP) activities consisting of three sets of 15-m sprints with weighted vests on 20-m sprint performance after the break.Methods: Using a randomized, and counterbalanced cross-over design, twenty U15 elite soccer players performed four RWUP trials which consisted of 15-min of passive rest (control: CONT), 3 × 15-m sprint (RW0%), sprinting with a vest-loaded at 5% of body-mass (BM) (RW5%), sprinting with a 10% BM vest (RW10%). The 3-min RWUP protocols started 10-min after the commencement of the 15-min between-halves break and concluded 2-min before its end. During each testing session, the participant’s RPE scores, and 20-m sprint performance were registered before the first half, and at the end of the break of the simulated match-play.Results: Significant time effects [F (1.72) = 54.37, d = 1.88, p &lt; 0.001; F (1.72) = 9.07, d = 0.77, p = 0.003], and condition effects [F (3.72) = 11.81, d = 1.53, p &lt; 0.001; F (3.72) = 7.36, d = 1.21, p = 0.003] were observed for RPE scores and 20-m sprint performance, respectively. Significant condition-by-time interactions were found for RPE scores (p &lt; 0.003, d = 0.54), and 20-m sprint performance (p &lt; 0.002, d = 0.70). Contrast analysis showed significantly higher RPE scores (p &lt; 0.001, d = 1.55), and improved 20-m sprint performance (p = 0.0004, d = 1.19) in the RW10% condition compared to all other conditions.Conclusion: Sprinting for 3-min with a 10% body-mass vest resulted in the highest RPE scores and the most substantial enhancements in 20-m sprint performance. Young elite soccer players should incorporate 10% body-mass weighted vests in their re-warm-ups to boost post-break sprint performance.
Sportverletzung-sportschaden, Apr 30, 2019
Background Team handball is an intense sport with special requirements on technical and tactical ... more Background Team handball is an intense sport with special requirements on technical and tactical skills as well as physical performance. The ability of handball players to make repeated powerful muscular contractions in pushing and throwing the ball is crucial to success. Objective This study investigated the effects of elastic band training on upper body peak power output, ball throwing velocity, and local muscle volume of junior handball players. Materials and Methods Thirty handball players (a single national-level Tunisian team) were randomly assigned to a control group (CG; n = 15) and an experimental group (EG; n = 15). Pre- and post-interventional measurements included force-velocity tests, one-repetition maximum (1RM) bench press and pull-over strength, ball throwing velocity in three types of throw (jumping shot, 3-step running throw, and standing throw), and anthropometric estimates of limb volumes. The EG additionally performed an elastic band training programme twice a week for 8 weeks immediately before engaging in regular handball training. The control group underwent no additional elastic band training. Results The EG demonstrated greater improvements in absolute and relative peak power (p &lt; 0.001; 49.3 ± 22.9 % and 47.9 ± 24.6 %, respectively), 1RM strength (p &lt; 0.001; 25.3 ± 2.2 % and 44.1 ± 9.0 % for 1RM bench press and pull over, respectively), and throwing velocity in all three types of ball throws (p &lt; 0.001; 25.1–26.1 %), compared to the CG (3.9–4.4 %). Limb volumes increased significantly (p = 0.001, 8.0 ± 7.5 %) in the EG, with no significant change (p = 0.175, 2.6 ± 7.0 %) in the CG. Conclusions We conclude that additional elastic band training performed twice a week for 8 weeks improves measures relevant to game performance, particularly strength, power, and ball throwing velocity.
Journal of Sport and Health Science, Dec 1, 2020
This study aimed to assess the effectiveness and time course for improvements in explosive action... more This study aimed to assess the effectiveness and time course for improvements in explosive actions through resistance training (RT) vs. plyometric training (PT) in prepubertal soccer players. Methods: Thirty-four male subjects were assigned to: a control group (n = 11); an RT group (5 regular soccer training sessions per week, n = 12); a PT group (3 soccer training sessions and 2 RT sessions per week, n = 11). The outcome measures included tests for the assessment of muscle strength (e.g., 1 repetition maximum half-squat test), jump ability (e.g., countermovement jump, squat jump, standing long jump, and multiple 5 bounds test), linear speed (e.g., 20 m sprint test), and change of direction (e.g., Illinois change of direction test). Results: The RTG showed an improvement in the half-squat (D = 13.2%; d = 1.3, p < 0.001) and countermovement jump (D = 9.4%; d = 2.4, p < 0.001) at Week 4, whereas improvements in the 20-m sprint (D = 4.2%; d = 1.1, p < 0.01); change of direction (CoD) (D = 3.8%; d = 2.1, p < 0.01); multiple 5 bounds (D = 5.1%; d = 1.5, p < 0.05); standing long jump (D = 7.2%; d = 1.2, p < 0.01); squat jump (D = 19.6%; d = 1.5, p < 0.01); were evident at Week 8. The PTG showed improvements in CoD (D = 2.1%; d = 1.3, p < 0.05); standing long jump (D = 9.3%; d = 1.1, p < 0.01); countermovement jump (D = 16.1%; d = 1.2, p < 0.01); and squat jump (D = 16.7%; d = 1.4, p < 0.01); at Week 8 whereas improvements in the 20-m sprint (D = 4.1%; d = 1.3, p < 0.01); and multiple 5 bounds (D = 7.4%; d = 2.4, p < 0.001); were evident only after Week. The RT and PT groups showed improvements in all sprint, CoD, and jump tests (p < 0.05) and in half-squat performance, for which improvement was only shown within the RTG (p < 0.001). Conclusion: RT and PT conducted in combination with regular soccer training are safe and feasible interventions for prepubertal soccer players. In addition, these interventions were shown to be effective training tools to improve explosive actions with different time courses of improvements, which manifested earlier in the RTG than in the PTG. These outcomes may help coaches and fitness trainers set out clear and concise goals of training according to the specific time course of improvement difference between RT and PT on proxies of athletic performance of prepubertal soccer players.
Weightlifting training and tapering in male handball 2 BSTRACT The purpose of this study was to a... more Weightlifting training and tapering in male handball 2 BSTRACT The purpose of this study was to assess the effect of short-term resistance training and two weeks of tapering on physical performances in handball players. Following a ten-week progressive resistance training program, subjects were divided between an experimental (n = 10) and a control group (n = 10). The experimental group completed a resistance training program, followed by a two-week period when the training intensity was tapered by 60%, while the control group maintained their typical pattern of training. Muscle power (force-velocity test and squat and counter-movement jump tests), sprinting ability (10m and 30m), ability to change direction (T-half test) and throwing velocity (a 3-step throw with a run, and a jump throw) were evaluated before training, at the end of training and after tapering. The experimental group showed significantly larger interaction effects for the 10-week training period (12/15, 80%), than for the following 2 weeks of tapering (10/15, 67%), with the largest gains being in 15 m sprint times (d=3.78) and maximal muscular strength in the snatch (d=3.48). Although the performance of the experimental group generally continued to increase over tapering, the mean effect size for the training period was markedly higher (d=1.92, range: 0.95-3.78) than that seen during tapering (d=1.02, range:-0.17-2.09). Nevertheless the ten weeks of progressive resistance training followed by two weeks of tapering was an effective overall tactic to increase muscle power, sprint performance and ball throwing velocity in handball players.
Journal of Strength and Conditioning Research, Aug 1, 2019
The aim was to compare the effects of two differing 8-week in-season strength training programs (... more The aim was to compare the effects of two differing 8-week in-season strength training programs (contrast strength training [CST] vs. plyometric training [PT]) on selected performance tests (5 and 40m sprints, S 4 X 5 m change of direction test, squat (SJ) and countermovement (CMJ) jumps , leg peak power on a cycle ergometer force-velocity test, 1repetition maximal (1-RM) half squat, and electromyographic [EMG] activity of the vastus lateralis, vastus medialis and rectus femoris muscles during vertical jump tests). Forty male soccer players (age = 15.8 ± 0.4 years; body mass = 58.8 ± 6.3 kg; body height = 1.74 ± 0.06 m; body fat = 10.5 ± 1.9 %) were divided between a contrast strength (CSG, n = 14), plyometric (PG, n = 14) and control groups (CG, n = 12). Both training programs enhanced sprint performance (p<0.001 in 5m; p≤0.05 in 40m) and change of direction test scores (p<0.001) relative to controls. PG and CSG increased SJ height relative to the CG, with a slightly greater response in CSG compared to PG (p≤0.05). The majority of CMJ scores increased significantly in both CSG and PG relative to the CG, with no inter-group differences in training response. The majority of force-velocity scores increased significantly in the CSG relative to PG and CG. The EMG parameters also increased in the CSG relative to both PG and CG. In summary, most measures of athletic performance in male soccer players were enhanced after CST and PT. However, the improvement of physical performance was better with eight weeks of CST than with PT. Thus, coaches should be encouraged to include CST as an element of in-season conditioning.
BMC sports science, medicine & rehabilitation, Jun 4, 2016
Background: The postural and neuromuscular performances in healthy children taekwondo (TKD) pract... more Background: The postural and neuromuscular performances in healthy children taekwondo (TKD) practitioners in comparison with control children were examined. Methods: Seventeen healthy pre-pubertal males undertaking only physical education at school (age: 11.88 ± 0. 33 years) and 12 pre-pubertal male TKD practitioners (>3 years, 4 sessions a week) (age 11.66 ± 0.49 years) were recruited. Performances in the dynamic postural control (Star Excursion Balance Test-SEBT), vertical jump [squat jump (SJ) and countermovement jump (CMJ)] and sprint running (distances: 5, 10, 20 and 30 m) tests were compared between the two groups. Results: The performances of the TKD practitioners were better than those of the non-TKD active for the SEBT (for 14 of 16 conditions, p < 0.05), SJ (p < 0.01), CMJ (p < 0.03) sprint running (5 m, p < 0.01; 10 m, p < 0.04; the performances for the 20 and 30 m sprints were not significant, p > 0.05). Conclusions: TKD practice would stimulate sensory input and motor output of the postural system that would enhance its efficiency. In addition, the dynamic nature of TKD would develop the muscle power of the lower limbs. In our sample of healthy pre-pubertal males, TKD appears to improve postural and neuromuscular functions, but further research is required.
Journal of Sports Medicine and Physical Fitness, Sep 1, 2017
We aimed to examine the validity of an ice hockey-specific complex test (IHCT) and nonspecific of... more We aimed to examine the validity of an ice hockey-specific complex test (IHCT) and nonspecific off-ice tests for sports performance. Eighteen professional athletes (27.4±6.0 years) underwent the IHCT, maximal strength squat tests, an endurance cycling test (PWC 170) and posturography during in the first week of the pre-seasonal training. The IHCT included parameters of load (e.g., 10-m and 30-m sprint, transition and weave agility without and with puck, slap and wrist shots before and after the test). The players were closely accompanied during the season of competition (seven months) in order to collect match performance data. Based on these data, we calculated a match performance score (MPS) for each player. Stability indicator (r2=0.39), weave agility with puck (r2=0.39), maximal relative squat (r2=0.37) and frequency band F7-8 (r2=0.35) proved to be the most valid tests. However, with the MPS as dependent variable, 21 of 44 parameters tested (48%) explained 10% or more of variance. The current findings suggest that postural stability, cerebellar control mechanisms and concentric maximum leg strength are the most important predictors of MPS. Regarding IHCT, actions with the puck under fatigue conditions and the ability to recover quickly are highly relevant for ice hockey players.
International Journal of Sports Science & Coaching, Jun 1, 2012
The aim of this study was to investigate the effect of free throw shooting with a reduced diamete... more The aim of this study was to investigate the effect of free throw shooting with a reduced diameter rim (diameter 0.35 m) upon the kinematics of basketball free throws. Ten basketball players (mean ± SD age 17.1 ± 0.7 years, height 1.85 ± 0.23 m, body mass 78.8 ± 5.8 kg) performed 8 “clean” successful free throws; 4 in a standard rim (diameter = 0.45 m), and 4 in a reduced diameter rim (diameter = 0.35 m). Ball release angle, ball release speed, ball release height and angles at release in elbow, shoulder, trunk, knee and ankle joints were determined for each subject. Statistical analysis showed significant increases in ball release angle, in ball release speed, in shoulder joint angle at release ( p &lt; 0.0001) and in ball release height ( p &lt; 0.01) when shooting in a reduced diameter rim. There were no other significant differences ( p &gt; 0.05) in any other determined parameter between the standard and reduced rim conditions. The increase of the minimum entry angle of the ball through the rim, caused by the 0.10 m reduction in diameter of the standard rim, resulted in subjects performing clean successful free throws with higher release angles and consequently with higher release speeds. The reduced hoop diameter rim can be used as an aid in training of young basketball players. Specifically, this constraint may act to increase ball release angle in basketball players with low percentage of successful free throws and when the principal cause of decreased free throws accuracy is due to a shot technique with low release angle.
Journal of Sports Sciences, Mar 1, 2013
The present paper investigated the effects of a shoot training programme with a reduced hoop diam... more The present paper investigated the effects of a shoot training programme with a reduced hoop diameter (0.35 m) rim on kinematics and performance of basketball free-throws. Eighteen young male basketball players were divided into control (CG, n = 9) and experimental (EG, n = 9) groups. Both groups undertook a 10-week training programme comprising two training sessions per week. Under fatigued conditions, each participant shot 150 free-throws in each training session, with the CG using a standard rim, and the EG a smaller rim. All other training was identical between groups. Ball release parameters, player&amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;#39;s kinematics and mean of successful free-throws (out of 150 attempts) were determined for each participant, before and after completion of the training programme. Following training, a significant increase (P &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt; 0.05) in ball release angle, speed and height and in shoulder joint angle at release (P &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt; 0.01) was observed for the EG. Both the CG (P &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt; 0.001) and the EG (P &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt; 0.0001) showed an increase in the number of successful free throws, although the increase was greater (P &amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;amp;lt; 0.05) for the EG (22.7 ± 6.4 free throws) than for the CG (14.6 ± 7.8 free throws). We conclude that training with a reduced rim significantly improves free-throw performance in young basketball players.
Frontiers in sports and active living, Feb 22, 2023
The effects of upper and lower limb elastic band training on the change of direction, jump, power... more The effects of upper and lower limb elastic band training on the change of direction, jump, power, strength and repeated sprint ability performance in adolescent female handball players.
Movement & Sport Sciences, 2019
This study made a preliminary exploration of the efficacy of physically-based cognitivebehavioral... more This study made a preliminary exploration of the efficacy of physically-based cognitivebehavioral therapy and deep relaxation for children with attention-deficit hyperactivity disorder (ADHD). Methods: ADHD behavior and cognitive functions were assessed by test D2 and Conner's scale before and after a one-year physically-based training program. The reliability of test scores was assessed by repeat testing of a control group (CG) of 10 students who did not have ADHD. Children (10 per group) with ADHD were assigned to physically-based cognitive-behavioral therapy and deep relaxation (E1) or physically-based cognitivebehavioral alone (E2). Results: After 52 weeks of treatment, an intra-group comparison showed that E1 and E2 had improved their scores on the test D2, whereas CG showed no significant change. In addition, most participants with ADHD showed a remarkable improvement in their attentional behavior, with group E1 responding better to treatment than group E2. Conclusions: Physically-based cognitive behavioral therapy appears to improve function and social competence in children with ADHD, and should be recommended as an alternative or supplement to pharmaceutical treatment.
Frontiers in Physiology, Aug 18, 2020
This study examined the effects of a 10-week combined upper and lower limb plyometric training (U... more This study examined the effects of a 10-week combined upper and lower limb plyometric training (ULLPT) programs on components of physical performance in young female handball players. Methods: Participants aged 15.8 ± 0.2 years were randomly assigned between the experimental (EG; n = 17) and control (CG; n = 17) groups. Two-way analyses of performance (group × time) assessed changes in handgrip force, back extensor strength; medicine ball throwing, 30-m sprint times, change of direction (CoD) [Modified Illinois test (Illinois-MT)], four jumping tests [squat jump (SJ), countermovement jump (CMJ), CMJ with arms (CMJA) and 5 jump test (5JT), static and dynamic balance, and repeated sprint T-test scores (RSTT)]. Results: After 10 weeks of plyometric training (two sessions per week), group × time interactions showed significant changes in EG relative to CG in right and left handgrip force, back extensor strength and medicine ball throwing [p < 0.001, d = 1.51 (large); p < 0.0001, d = 0.85 (large); p < 0.001, d = 0.90 (large); p < 0.0001, d = 0.52 (medium), respectively]. Group × time interactions also showed improvements of EG relative to CG in sprint times [5 m (p = 0.02, d = 0.80 (large)); 10 m (p < 0.0001, d = 1.00 (large)); 20 m (p = 0.02, d = 1.41 (large)); and 30 m (p = 0.02, d = 2.60 (large))], CoD [Illinois-MT (p < 0.001, d = 1.58 (large))] and jumping [(SJ, CMJ, CMJA, and 5JT, p = 0.001, d = 0.87 (large); p < 0.001, d = 1.17 (large); p < 0.001, d = 1.15 (large); and p = 0.006, d = 0.71 (medium)) respectively]. Further, all RSTT scores (best time, mean time, total time, and fatigue index) improved significantly in the experimental group, with group × time interactions varying between p < 0.001 and p = 0.049 (d value large to medium). However, balance did not differ significantly between EG and CG. Conclusion: We conclude that 10 weeks of ULLPT improved many measures of physical performance in young female handball players.
International Journal of Sports Physiology and Performance, Feb 1, 2019
This study analyzed the effects of complex strength training on the explosive muscular performanc... more This study analyzed the effects of complex strength training on the explosive muscular performance of junior female handball players. Subjects were arbitrarily divided between an experimental group (n=14) and a control group (n=14). Training sessions and matches were performed together, but during the 10-week intervention, the experimental group replaced a part of the regular regimen by complex strength training. Measures assessed in both groups before and after the intervention included: running times over 5, 10, 20 and 30 m , change of direction tests [T-half agility test and modified Illinois test], repeated shuttle sprint ability and repeated changes of direction tests, jumping [squat, counter-movement, counter-movement with aimed arms and five-jump tests], static and dynamic balance, back extensor strength and 1RM half-squat. The intervention yielded increases in sprint (10 m: 11.7%), change of direction performance (T-half: 5.1%; modified Illinois: 4.2%), jumping (squat p&lt;0.01; 19%; countermovement p&lt;0.01; 20.3%; countermovement aimed arms p&lt;0.01; 19.3%; 5-jump p&lt;0.05; 15.2%), and one of 4 repeated sprint scores (best time, p&lt;0.05; 5.9%). However, Repeated sprint T-test and balance scores were unchanged. Complex srength training develops abilities important to handball performance.
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Papers by Mohamed Souhaiel Chelly