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Fukutani A, Misaki J, Isaka T. Influence of Joint Angle on Residual Force Enhancement in Human Plantar Flexors. Front Physiol. 2017;8:234doi: 10.3389/fphys.2017.00234.
Fukutani, A., Misaki, J., & Isaka, T. (2017). Influence of Joint Angle on Residual Force Enhancement in Human Plantar Flexors. Frontiers in physiology, 8234. https://doi.org/10.3389/fphys.2017.00234
Fukutani, Atsuki, et al. "Influence of Joint Angle on Residual Force Enhancement in Human Plantar Flexors." Frontiers in physiology vol. 8 (2017): 234. doi: https://doi.org/10.3389/fphys.2017.00234
Fukutani A, Misaki J, Isaka T. Influence of Joint Angle on Residual Force Enhancement in Human Plantar Flexors. Front Physiol. 2017 Apr 24;8:234. doi: 10.3389/fphys.2017.00234. eCollection 2017. PMID: 28484395; PMCID: PMC5401888.
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Front Physiol. 2017 Apr 24;8:234. doi: 10.3389/fphys.2017.00234. eCollection 2017.

Influence of Joint Angle on Residual Force Enhancement in Human Plantar Flexors.

Frontiers in physiology

Atsuki Fukutani, Jun Misaki, Tadao Isaka

Affiliations

  1. Faculty of Kinesiology, University of CalgaryCalgary, AB, Canada.
  2. Japan Society for the Promotion of Science, Postdoctoral Fellowships for Research AbroadTokyo, Japan.
  3. Research Organization of Science and Technology, Ritsumeikan UniversityShiga, Japan.
  4. Graduate School of Sport and Health Science, Ritsumeikan UniversityShiga, Japan.
  5. Faculty of Sport and Health Science, Ritsumeikan UniversityShiga, Japan.

PMID: 28484395 PMCID: PMC5401888 DOI: 10.3389/fphys.2017.00234

Abstract

Compared to pure isometric contractions, isometric muscle force at a given length is larger when the eccentric contraction is conducted before the isometric contraction. This phenomenon is widely known as residual force enhancement, and has been confirmed consistently in isolated muscle experiments. The purpose of this study was to confirm whether residual force enhancement also occurs in human plantar flexors and to examine its joint angle dependence. Eleven men participated in this study. Isometric joint torque was measured in a Control trial (pure isometric contraction) and Residual force enhancement (RFE) trial (isometric contraction after eccentric contraction) at plantar flexion 0° (Short condition) and dorsiflexion 15° (Long condition). Fascicle length and pennation angle of the medial gastrocnemius were measured simultaneously to evaluate the influence of architectural parameters on isometric joint torque. Isometric joint torque observed in the Short condition was not significantly different between the Control and RFE trials (Control: 42.9 ± 8.0 Nm, RFE: 45.1 ± 8.4 Nm) (

Keywords: electrical stimulation; fascicle length; muscle length; pennation angle; plantar flexion

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