## Test-Retest Reliability and Sensitivity of Common Strength and Power Tests over a Period of 9 Weeks

2022
Journal article
Published
##### Published in
Sports ; 10 (2022), 11. - 171. - MDPI. - eISSN 2075-4663
##### Abstract
This study evaluated the reliability and sensitivity of a set of different common strength and power tests in a healthy adult population in a span of 9 weeks. Seventeen subjects (24.2 ± 2.2 years, 1.75 ± 0.10 m, 68.6 ± 14.2 kg, seven women) participated in the study. We tested countermovement jumps, reactive hops, and the maximal voluntary contraction (MVC) of handgrip and isometric knee extension. The tests were conducted in three separate sessions across a nine-week period, with one week between the first two sessions and eight weeks between the second and the third. Reliability and sensitivity statistics for each test were calculated for both the average of three trials and the best result during each session. The MVC of isometric knee extension and handgrip, as well as the countermovement jump test, demonstrated very high reliability and sensitivity over the nine-week period. The peak force of the reactive hops demonstrated high reliability but high sensitivity only for the average but not for the best result. The average contact time of reactive hops was neither a sensitive nor reliable measurement. In conclusion, isometric maximal knee extension and handgrip tests, as well as countermovement jumps and peak force of reactive hops, can be used as reliable and sensitive measurements of isometric and reactive strength and power over time periods of up to eight weeks. We recommend the use of the average results of three trials instead of the best performance value for longitudinal studies, as this procedure produces more consistent results and a lower measurement error.
796 Sport
##### Keywords
countermovement-jump; CMJ; handgrip strength; knee extension; MVC; reactive hop; reliability; sensitivity
##### Cite This
ISO 690VENEGAS-CARRO, Maria, Andreas KRAMER, Maria MORENO-VILLANUEVA, Markus GRUBER, 2022. Test-Retest Reliability and Sensitivity of Common Strength and Power Tests over a Period of 9 Weeks. In: Sports. MDPI. 10(11), 171. eISSN 2075-4663. Available under: doi: 10.3390/sports10110171
BibTex
@article{VenegasCarro2022-11-02TestR-59535,
year={2022},
doi={10.3390/sports10110171},
title={Test-Retest Reliability and Sensitivity of Common Strength and Power Tests over a Period of 9 Weeks},
number={11},
volume={10},
journal={Sports},
author={Venegas-Carro, Maria and Kramer, Andreas and Moreno-Villanueva, Maria and Gruber, Markus},
note={Article Number: 171}
}

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<dcterms:abstract xml:lang="eng">This study evaluated the reliability and sensitivity of a set of different common strength and power tests in a healthy adult population in a span of 9 weeks. Seventeen subjects (24.2 ± 2.2 years, 1.75 ± 0.10 m, 68.6 ± 14.2 kg, seven women) participated in the study. We tested countermovement jumps, reactive hops, and the maximal voluntary contraction (MVC) of handgrip and isometric knee extension. The tests were conducted in three separate sessions across a nine-week period, with one week between the first two sessions and eight weeks between the second and the third. Reliability and sensitivity statistics for each test were calculated for both the average of three trials and the best result during each session. The MVC of isometric knee extension and handgrip, as well as the countermovement jump test, demonstrated very high reliability and sensitivity over the nine-week period. The peak force of the reactive hops demonstrated high reliability but high sensitivity only for the average but not for the best result. The average contact time of reactive hops was neither a sensitive nor reliable measurement. In conclusion, isometric maximal knee extension and handgrip tests, as well as countermovement jumps and peak force of reactive hops, can be used as reliable and sensitive measurements of isometric and reactive strength and power over time periods of up to eight weeks. We recommend the use of the average results of three trials instead of the best performance value for longitudinal studies, as this procedure produces more consistent results and a lower measurement error.</dcterms:abstract>
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