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Reliability of power in physical performance tests.

W G Hopkins1, E J Schabort, J A Hawley

  • 1Department of Physiology, School of Medical Sciences, University of Otago, Dunedin, New Zealand. will.hopkins@otago.ac.nz

Sports Medicine (Auckland, N.Z.)
|April 5, 2001
PubMed
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This meta-analysis identifies the most reliable physical power tests for athletes and patients. Sprint running, treadmill peak power, and constant-power tests show high reliability, crucial for accurate performance assessment.

Area of Science:

  • Exercise Physiology
  • Sports Science
  • Biomechanical Analysis

Background:

  • The precision of physical performance assessments relies heavily on the reliability of power testing.
  • Accurate power measurement is essential for evaluating athletes, patients, and research participants.

Purpose of the Study:

  • To identify the most reliable measures of physical power.
  • To determine factors influencing the reliability of power testing in healthy adults.

Main Methods:

  • A meta-analytic review of 101 studies involving healthy adults.
  • Reliability assessed using typical error of measurement (coefficient of variation, CV) and percent change in mean between trials.
  • Data analyzed for various power measures including sprint running, treadmill, cycle ergometer, and jump tests.

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Main Results:

  • Field sprint running, treadmill/cycle ergometer peak power, and constant-power tests demonstrated the lowest CV (approx. 0.9%).
  • Isokinetic ergometer mean power showed a high CV (> 4%).
  • Factors increasing CV included non-athlete status, female sex, shorter/longer test durations, and respiratory vs. ergometer measures. Practice trials significantly improved reliability.

Conclusions:

  • Sprint running and specific ergometer tests offer the highest reliability for assessing physical power.
  • Understanding factors like participant status, test duration, and the necessity of practice trials is key to optimizing power testing protocols.
  • These findings aid practitioners and researchers in selecting and designing reliable physical performance tests.