Measurement of human gracilis muscle isometric forces as a function of knee angle, intraoperatively

Journal of Biomechanics
Can A YucesoyMustafa Karahan

Abstract

The goals of the present study were (1) to measure the previously unstudied isometric forces of activated human Gracilis (G) muscle as a function of knee joint angle and (2) to test whether length history effects are important also for human muscle. Experiments were conducted intraoperatively during anterior cruciate ligament (ACL) reconstruction surgery (n=8). Mean peak G muscle force, mean peak G tendon stress and mean optimal knee angle equals 178.5±270.3N, 24.4±20.6 MPa and 67.5±41.7 °, respectively. The substantial inter-subject variability found (e.g., peak G force ranges between 17.2 and 490.5 N) indicate that the contribution of the G muscle to knee flexion moment may vary considerably among subjects. Moreover, typical subject anthropometrics did not appear to provide a sound estimate of the peak G force: only a limited insignificant correlation was found between peak G force and subject mass as well as mid-thigh perimeter and no correlation was found between peak G force and thigh length. The functional joint range of motion for human G muscle was determined to be at least as wide as full knee extension to 120 ° of knee flexion. However; the portion of the knee angle-muscle force relationship operationalized is not uni...Continue Reading

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Citations

Apr 30, 2016·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Filiz AteşCan A Yucesoy
Mar 30, 2019·Orthopaedic Journal of Sports Medicine·Martha M MurrayLyle J Micheli
Aug 25, 2021·Journal of Electromyography and Kinesiology : Official Journal of the International Society of Electrophysiological Kinesiology·Filiz AteşKenton R Kaufman

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