Improving the ecological validity of isokinetic knee tests: Reciprocal concentric- eccentric movements as suitable alternative for discrete tests

Tobias Alt, Kevin Nolte, Dennis Horn, Dominik Modenbach, Thomas Jaitner, Axel Knicker

Publikation: Beitrag in FachzeitschriftZeitschriftenaufsätzeForschungBegutachtung

Abstract

sokinetic knee tests mostly evaluate reciprocal concentric-concentric flexor-extensor movements in a seated position. Discrete tests generate higher moments, but time requirements impede their widespread implementation. This study examined if hip angle (flexed vs. extended) and test modality (discrete vs. reciprocal) affect camera- based data (100fps). Sixteen healthy males performed concentric (con) and eccentric (ecc) isokinetic knee flexor (H) and extensor (Q) movements (60°/s). Peak moments and contractional work of discrete and reciprocal tests (QconQecc, HconHecc) strongly correlated for extended (Q:91%≥R2≥71%; H:95%≥R2≥87%) and flexed hip (Q:88%≥R2≥70%; H:81%≥R2≥75%) without significant differences (p>0.05) between test modalities. Discrete and ‘traditional’ seated QconHcon-tests revealed substantially lower correlations for extended (Q:44%≥R2≥43%; H:55%≥R2≥54%) and flexed hip (Q:81%≥R2≥77%; H:48%≥R2≥47%). Hip angle influenced contractional work and angles of peak moments most. Peak moments were predominantly unaffected. These insights assist in interpreting isokinetic data of different test modalities. If time constraints prevent discrete knee tests, concentric-eccentric movements provide highly correlated outcomes.
OriginalspracheEnglisch
ZeitschriftMeasurement in Physical Education and Exercise Science
PublikationsstatusEingereicht - 12.2022

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