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Olivier Girard, Franck Brocherie, Jean-Benoit Morin, and Grégoire P. Millet

Purpose:

To determine the intrasession and intersession (ie, within- and between-days) reliability in treadmill sprinting-performance outcomes and associated running mechanics.

Methods:

After familiarization, 13 male recreational sportsmen (team- and racket-sport background) performed three 5-s sprints on an instrumented treadmill with 2 min recovery on 3 different days, 5–7 d apart. Intrasession (comparison of the 3 sprints of the first session) and intersession (comparison of the average of the 3 sprints across days) reliability of performance, kinetics, kinematics, and spring-mass variables were assessed by intraclass correlation coefficient (ICC) and coefficients of variation (CV%).

Results:

Intrasession reliability was high (ICC > .94 and CV < 8%). Intersession reliability was good for performance indices (.83 < ICC < .89 and CV < 10%, yet with larger variability for mean velocity than for distance covered or propulsive power) and kinetic parameters (ICC > .94 and CV < 5%, yet with larger variability for mean horizontal forces than for mean vertical forces) and ranged from good to high for all kinematic (.88 < ICC < .95 and CV ≤ 3.5%) and spring-mass variables (.86 < ICC < .99 and CV ≤ 6.5%). Compared with intrasession, minimal detectable differences were on average twice larger for intersession designs, except for sprint kinetics.

Conclusion:

Instrumented treadmill sprint offers a reliable method of assessing running mechanics during single sprints either within the same session or between days.

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Javier Abian-Vicen, Adrián Castanedo, Pablo Abian, Cristina Gonzalez-Millan, Juan José Salinero, and Juan Del Coso

The aim was to analyze the influence of competitive round on muscle strength, body-fluid balance, and renal function in elite badminton players during a real competition. Body mass, jump height during a countermovement jump, handgrip force, and urine samples were obtained from 13 elite badminton players (6 men and 7 women) before and after the 2nd-round and quarterfinal matches of the national Spanish badminton championship. Sweat rate was determined by using prematch-to-postmatch body-mass change and by weighing individually labeled fluid bottles. Sweat rates were 1.04 ± 0.62 and 0.98 ± 0.43 L/h, while rehydration rate was 0.69 ± 0.26 and 0.91 ± 0.52 L/h for the 2nd round and quarterfinals, respectively. Thus, dehydration was 0.47% ± 1.03% after the 2nd round and 0.23% ± 0.43% after the quarterfinals. There were no differences in prematch-to-postmatch jump height, but jump height was reduced from 37.51 ± 8.83 cm after the 2nd-round game to 34.82 ± 7.37 cm after the quarterfinals (P < .05). No significant differences were found in handgrip force when comparing prepost matches or rounds, although there were significant differences between dominant and nondominant hands (P < .05). The succession of rounds caused the appearance of proteinuria, hematuria, glycosuria, and higher nitrite and ketone concentrations in urine. Rehydration patterns during a real badminton competition were effective to prevent dehydration. A badminton match did not affect jump height or handgrip force, but jump height was progressively reduced by the competitive round. Badminton players’ renal responses reflected diminished renal flux due to the high-intensity nature of this racket sport.

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Marcel Bouffard and Albert E. Wall

The effect of knowledge on decision making and performance of educable mentally handicapped (EMH) adolescents was studied in a simulated table tennis situation. In two experiments, knowledge about where the ball would land on the table was manipulated. The position the players selected to return the ball was affected by the knowledge (uncertainty) associated with its future landing location. Depending upon the degree of uncertainty, results indicated the players used (a) a total preparation for one particular event strategy, (b) a partial preparation for one particular event strategy, or (c) a no-preparation for one particular event strategy. Further, knowledge about the ball’s future landing location affected the decision about the type of stroke to use and had a minimal effect on the number of balls hit. Overall, these results demonstrate an intricate relationship between knowledge, decision making, and performance in a simulated racket sport by EMH adolescents.

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Pedro L. Valenzuela, Guillermo Sánchez-Martínez, Elaia Torrontegi, Javier Vázquez-Carrión, Manuela González, Zigor Montalvo, and Grégoire P. Millet

, and the evidence on the acute response to an on-court RSH session for racket sport players is still scarce. 15 , 16 The present study analyzed the acute performance, physiological, and perceptual response to an on-court badminton-specific RS session performed in normoxia or under systemic (RSH) and

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Mathias H. Kosack, Walter Staiano, Rasmus Folino, Mads B. Hansen, and Simon Lønbro

interval-based sports, including table tennis as the only racket sport, which is the closest studies get to the workload during a badminton match. 18 , 19 , 28 , 29 These studies evaluated the effect of MF on physical and technical performance in a game-like situation. Interestingly, the studies observed

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Yann Le Mansec, Jérôme Perez, Quentin Rouault, Julie Doron, and Marc Jubeau

As a racket sport, it is well known that performance in badminton is multifactorial, including physiological, psychological, technical, and/or tactical parameters. 1 However, the impact of each of these parameters on the ability to perform at high level is still a matter of debate. For instance

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Stefanie Klatt and Nicholas J. Smeeton

considering other team and racket sport games in the future. Moreover, it may be the case that other psychological factors such as self-regulation (e.g.,  Baumeister, Vohs, & Tice, 2007 ) influence decision making by biasing sensory integration. For example, more self-control is needed to make more accurate

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Thimo Wiewelhove, Constantin Thase, Marcel Glahn, Anthony Hessel, Christoph Schneider, Laura Hottenrott, Tim Meyer, Michael Kellmann, Mark Pfeiffer, and Alexander Ferrauti

.5 ± 1.8 y; height, 184.9 ± 6.0 cm; body mass, 83.8 ±7.3 kg) were recruited to take part in this study. They were all members of regional representative teams, had at least 10 years of specific team or racket sport training experience, and performed 6 to 10 hours of weekly training. After being informed

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Arilene M.S. Santos, Alberto J. Maldonado, Antônio V.M. de Sousa Junior, Susi O.S. Brito, Rayane C. de Moura, Caique Figueiredo, Paula A. Monteiro, Lucas M. Neves, Ismael F. Freitas Junior, Marcos A.P. dos Santos, Sergio L.G. Ribeiro, and Fabrício E. Rossi

Badminton is a racket sport that requires short and high-intensity actions from athletes and practitioners, with an average heart rate greater than 90% of the maximum heart rate during the match; in the same sense, it is known that 60% to 70% of the energy used during a match is supplied by the