Residual force enhancement during multi-joint leg extensions at joint- angle configurations close to natural human motion

Journal of Biomechanics
Florian PaternosterAnsgar Schwirtz

Abstract

The isometric steady-state forces following lengthening are greater than those produced at the same muscle length and activation level but without prior lengthening. Although residual force enhancement (RFE) has been investigated across a range of conditions, its relevance for daily human movement is still poorly understood. We aimed to study RFE in a setup imitating daily activity, i.e., submaximal activation of the lower extremity's muscles with slightly flexed knee joints comparable to human walking. A motor-driven leg press dynamometer was used for randomly arranged purely isometric and isometric-eccentric-isometric contractions. Thirteen subjects performed multi-joint leg extensions, which were feedback-controlled at 30% of maximum voluntary vastus lateralis activation. Isometric-eccentric-isometric contractions incorporated a stretch from 30° to 50° knee flexion, while isometric contractions were performed at 50° knee flexion. Isometric contractions following stretch and purely isometric reference contractions were performed at 50° knee flexion. Kinematics, forces, and muscular activity were measured using 3D optical motion tracking, force plates, and surface EMG of 9 lower limb muscles of the right leg and joint torques ...Continue Reading

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Citations

May 29, 2016·Journal of Biomechanics·Tobias SiebertNorman Stutzig
Jan 25, 2018·Journal of Applied Biomechanics·Neil ChapmanRudi Meir
Sep 7, 2020·European Journal of Applied Physiology·Patrick BakeneckerDaniel Hahn
May 10, 2017·Frontiers in Physiology·Atsuki FukutaniTadao Isaka
Sep 19, 2020·Journal of Strength and Conditioning Research·Kevin E CaronGeoffrey A Power
Oct 27, 2020·Journal of Strength and Conditioning Research·Kevin E CaronGeoffrey A Power
Jun 2, 2021·Journal of Sport and Health Science·Daiani de CamposHeiliane de Brito Fontana
Aug 3, 2021·Physiological Reports·Florian K PaternosterWolfgang Seiberl

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