Within-Subject Variation, Measurement Error, and Selection of a Criterion Score

Hetherington, Ross

doi:10.1080/10671188.1973.10615183

Cited by 5 publications

(2 citation statements)

References 3 publications

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“…When multiple trials of a test are collected, then the decision regarding which trial or trials to use as the criterion score represents a long forgotten question, as evidenced by the fact that the vast majority of published studies having used the best CMJ (4). It has been recommended that the selection should be based on whether the criterion score is supposed to reflect the typical or maximum performance (13). Therefore, it appears evident that the average method should be used to determine the criterion score if an estimate of typical CMJ performance is required.…”

Section: Discussionmentioning

confidence: 99%

Improving the Signal-To-Noise Ratio When Monitoring Countermovement Jump Performance

Kennedy

Drake

2021

Journal of Strength and Conditioning Research

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Kennedy, RA and Drake, D. Improving the signal-to-noise ratio when monitoring countermovement jump performance. J Strength Cond Res XX(X): 000-000, 2018-Countermovement jump (CMJ) performance has been routinely used to monitor neuromuscular status. However, the protocol used to establish the criterion score is not well documented. The purpose of this study was to examine how the protocol used would influence of the sensitivity of CMJ variables in rugby union players. Fifteen male (age: 19.7 ± 0.5 years) rugby union players performed 8 CMJs on 2 occasions, separated by 7 days. The between-session coefficient of variation (CV) was calculated using 2 techniques for treating multiple trials, the average, and the trial with the best jump height (JH), and then compared with the smallest worthwhile change (SWC). The signal-to-noise ratio was measured as the group mean change in a variable divided by the CV. Using the average value across multiple trials is superior to the best trial method, based on lower CVs for all variables. Only the average performance across 6 or more trials was classified as ideal (CV < 0.5 × SWC) for peak velocity (PV). In addition, the signal-to-noise ratio for peak concentric power (PCP), PV, and JH were classified as good, irrespective of the treatment method. Although increasing the number of trials can reduce the random error, it may be pragmatic to simply take the average from 2 to 3 trials, facilitating a CV < SWC for PV, PCP, and JH. Due to its simplicity, JH may be considered the principal variable to monitor neuromuscular fatigue.

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Section: Discussionmentioning

confidence: 99%

Improving the Signal-To-Noise Ratio When Monitoring Countermovement Jump Performance

Kennedy

Drake

2021

Journal of Strength and Conditioning Research

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“…An estimate of reliability provides an indication of the expected error and statistical power of the measure and provides a tool for sample size estimation (Hetherington, 1973;Cohen, 1988). Most importantly, a reliable measure provides confidence that any changes observed in the measure are due to physiological changes within the subject, and not due to variability in the measure itself.…”

Section: Introductionmentioning

confidence: 99%