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Intrasession and Intersession Reliability of Running Mechanics during Treadmill Sprints

Abstract : 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%). Inter-session 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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Olivier Girard, Franck Brocherie, Jean-Benoît Morin, Grégoire P Millet. Intrasession and Intersession Reliability of Running Mechanics during Treadmill Sprints. International Journal of Sports Physiology and Performance, Human Kinetics, 2016, 11 (4), pp.432-439. ⟨10.1123/ijspp.2015-0145⟩. ⟨hal-01627097⟩



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