A1 Journal article (refereed)
Superimposing hip extension on knee flexion evokes higher activation in biceps femoris than knee flexion alone (2021)

Hegyi, A., Csala, D., Kovács, B., Péter, A., Liew, B.X.W., Yue, Y., Finni, T., Tihanyi, J., & Cronin, N.J. (2021). Superimposing hip extension on knee flexion evokes higher activation in biceps femoris than knee flexion alone. Journal of Electromyography and Kinesiology, 58, Article 102541. https://doi.org/10.1016/j.jelekin.2021.102541

JYU authors or editors

Publication details

All authors or editors: Hegyi, A.; Csala, D.; Kovács, B.; Péter, A.; Liew, B.X.W.; Yue, Y.; Finni, T.; Tihanyi, J.; Cronin, N.J.

Journal or series: Journal of Electromyography and Kinesiology

ISSN: 1050-6411

eISSN: 1873-5711

Publication year: 2021

Volume: 58

Article number: 102541

Publisher: Elsevier

Publication country: United Kingdom

Publication language: English

DOI: https://doi.org/10.1016/j.jelekin.2021.102541

Publication open access: Not open

Publication channel open access:


Hamstring muscle function during knee flexion has been linked to hamstring injury and performance. However, it is unclear whether knee flexion alone (KF) requires similar hamstring electromyography (EMG) activity pattern to simultaneous hip extension and knee flexion (HE-KF), a combination that occurs in the late swing phase of sprinting. This study examined whether HE-KF maximal voluntary isometric contraction (MVIC) evokes higher (EMG) activity in biceps femoris long head (BFlh) and semitendinosus (ST) than KF alone. Effects of shank rotation angles were also tested. Twenty-one males performed the above-mentioned MVICs while EMG activity was measured along ST and BFlh. Conditions were compared using a one-way mixed functional ANOVA model under a fully Bayesian framework. Higher EMG activity was found in HE-KF in all shank rotation positions than in KF in the middle region of BFlh (highest in the 9th channel, by 0.022 mV [95%CrI 0.014 to 0.030] in neutral shank position). For ST, this was only observed in the neutral shank position and in the most proximal channel (by 0.013 mV [95%CrI 0.001 to 0.025]). We observed muscle- and region-specific responses to HE-KF. Future studies should examine whether hamstring activation in this task is related to injury risk and sprint performance.

Keywords: biomechanics; thighs; muscles; knees; hip; tibia

Free keywords: isometric contraction; normalisation; semitendinosus; hamstring; hip extension; tibial rotation

Contributing organizations

Ministry reporting: Yes

Reporting Year: 2021

JUFO rating: 1

Last updated on 2022-19-08 at 19:44