Residual force enhancement is present in consecutive post-stretch isometric contractions of the hamstrings during a training simulation

Neil D Chapman; John W Whitting; Suzanne Broadbent; Zachary J Crowley-McHattan; Rudi Meir

doi:10.3390/ijerph18031154

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Residual force enhancement is present in consecutive post-stretch isometric contractions of the hamstrings during a training simulation

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Residual force enhancement is present in consecutive post-stretch isometric contractions of the hamstrings during a training simulation

Neil D Chapman, John W Whitting, Suzanne Broadbent, Zachary J Crowley-McHattan and Rudi Meir

International Journal of Environmental Research and Public Health, Vol.18(3), p.1154

2021

DOI: https://doi.org/10.3390/ijerph18031154

PMID: 33525530

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Abstract

history dependence

hamstrings

training simulation

electromyography

muscle

residual force enhancement

in vivo

Human Movement and Sports Science

Residual force enhancement (rFE) is observed when isometric force following an active stretch is elevated compared to an isometric contraction at corresponding muscle lengths. Acute rFE has been confirmed in vivo in upper and lower limb muscles. However, it is uncertain whether rFE persists using multiple, consecutive contractions as per a training simulation. Using the knee flexors, 10 recreationally active participants (seven males, three females; age 31.00 years ± 8.43 years) performed baseline isometric contractions at 150° knee flexion (180° representing terminal knee extension) of 50% maximal voluntary activation of semitendinosus. Participants performed post-stretch isometric (PS-ISO) contractions (three sets of 10 repetitions) starting at 90° knee extension with a joint rotation of 60° at 60°·s at 50% maximal voluntary activation of semitendinosus. Baseline isometric torque and muscle activation were compared to PS-ISO torque and muscle activation across all 30 repetitions. Significant rFE was noted in all repetitions (37.8-77.74%), with no difference in torque between repetitions or sets. There was no difference in activation of semitendinosus or biceps femoris long-head between baseline and PS-ISO contractions in all repetitions (ST; baseline ISO = 0.095-1.000 ± 0.036-0.039 Mv, PS-ISO = 0.094-0.098 ± 0.033-0.038 and BFlh; baseline ISO = 0.068-0.075 ± 0.031-0.038 Mv). This is the first investigation to observe rFE during multiple, consecutive submaximal PS-ISO contractions. PS-ISO contractions have the potential to be used as a training stimulus.

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Title: Residual force enhancement is present in consecutive post-stretch isometric contractions of the hamstrings during a training simulation
Creators: Neil D Chapman (Author) - Southern Cross University
John W Whitting (Author) - Southern Cross University
Suzanne Broadbent (Author) - Southern Cross University
Zachary J Crowley-McHattan (Author) - Southern Cross University
Rudi Meir (Author) - Southern Cross University
Publication Details: International Journal of Environmental Research and Public Health, Vol.18(3), p.1154
Publisher: MDPI AG; Switzerland
Identifiers: 991012911500502368
Academic Unit: Faculty of Health; School of Health and Human Sciences; Human Sciences
Language: English
Resource Type: Journal article

Residual force enhancement is present in consecutive post-stretch isometric contractions of the hamstrings during a training simulation

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