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Louise M. Burke and Peter Peeling

-based inferences approach ( Mengersen et al., 2016 ). This suggests that a number of options may be suitable when exploring the potential influence of supplement interventions on performance outcomes. Analysis of the reliability of performances of top athletes across a large number of sports ( Malcata & Hopkins

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Saud F. Alsubaie, Susan L. Whitney, Joseph M. Furman, Gregory F. Marchetti, Kathleen H. Sienko and Patrick J. Sparto

, moving the head in yaw or pitch directions) may be undertaken before determining the exercise prescription. To properly assess subjects’ performance during balance and vestibular exercises so that decisions can be made about progression of those exercises, the reliability of performance should be established

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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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Thomas Dos’Santos, Paul A. Jones, Jonathan Kelly, John J. McMahon, Paul Comfort and Christopher Thomas

Hori et al 26 investigated the reliability of performance measurements from ground-reaction-force data during the CMJ and the influence of sampling frequency (500, 400, 250, 300, 100, 50, and 25 Hz). Peak power, PF, and peak velocity demonstrated high reliability across sampling frequencies (ICC = .92

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Adam Beard, John Ashby, Ryan Chambers, Franck Brocherie and Grégoire P. Millet

, Snow RJ . Reliability of performance in repeated sprint cycling tests . J Sci Med Sport . 2002 ; 5 ( 4 ): 354 – 361 . PubMed ID: 12585619 doi:10.1016/S1440-2440(02)80024-X 12585619 10.1016/S1440-2440(02)80024-X 18. Hopker J , Myers S , Jobson SA , Bruce W , Passfield L . Validity

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Hayden J. Pritchard, Matthew J. Barnes, Robin J. Stewart, Justin W. Keogh and Michael R. McGuigan

the body composition and anaerobic performance of professional rugby union players . J Sports Sci . 2010 ; 28 ( 6 ): 679 – 686 . PubMed ID: 20397095 doi:10.1080/02640411003645695 10.1080/02640411003645695 20397095 25. McGuigan MR , Kane MK . Reliability of performance of elite Olympic

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Raúl Reina, Aitor Iturricastillo, Rafael Sabido, Maria Campayo-Piernas and Javier Yanci

15574101 29. Hori N , Newton RU , Kawamori N , McGuigan MR , Kraemer WJ , Nosaka K . Reliability of performance measurements derived from ground reaction force data during countermovement jump and the influence of sampling frequency . J Strength Cond Res . 2009 ; 23 ( 3 ): 874 – 882

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Hyun Chul Jung, Myong Won Seo, Sukho Lee, Sung Woo Jung and Jong Kook Song

groups was applied as a post hoc test. Individual mean changes of performance variables from pre- to posttests were calculated, and partial eta squared ( η p 2 ) was used to examine the effect size ( Cohen, 1988 ). The ICCs were performed to determine the test–retest reliability of performance tests

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Tiago Turnes, Rogério S.O. Cruz, Fabrizio Caputo and Rafael A. De Aguiar

– 358 . PubMed ID: 22401296 doi:10.2165/11597230-000000000-00000 22401296 10.2165/11597230-000000000-00000 3. Schabort EJ , Hawley JA , Hopkins WG , Blum H . High reliability of performance of well-trained rowers on a rowing ergometer . J Sports Sci . 1999 ; 17 ( 8 ): 627 – 632 . PubMed ID