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Intrasession and Intersession Reliability of Running Mechanics During Treadmill Sprints
International Journal of Sports Physiology and Performance
Girard, Olivier Brocherie, Franck Morin, Jean-Benoit Millet, Gregoire P eng 2015/09/12 06:00 Int J Sports Physiol Perform. 2016 May;11(4):432-9. doi: 10.1123/ijspp.2015-0145. Epub 2015 Sep 10.
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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