Maximal and submaximal isometric torque is elevated immediately following highly controlled active stretches of the hamstrings

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

doi:10.1016/j.jelekin.2020.102500

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Maximal and submaximal isometric torque is elevated immediately following highly controlled active stretches of the hamstrings

Journal article

Peer reviewed

Maximal and submaximal isometric torque is elevated immediately following highly controlled active stretches of the hamstrings

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

Journal of Electromyography and Kinesiology, Vol.56, pp.1-9

2021

DOI: https://doi.org/10.1016/j.jelekin.2020.102500

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Abstract

muscle

residual force enhancemenbt

history dependence

ultrasound

in vivo

hamstring strain injury

rehabilitation

neuromechanics

Hamstring strain rehabilitation programs with an eccentric bias are effective but have a low adherence rate. Post-stretch isometric (PS-ISO) contractions which incorporate a highly controlled eccentric contraction followed by an isometric contraction resulting in elevated torque during following stretch, compared with isometric contractions at the same joint angle. This study measured torque, activation and musculotendinous unit behaviour of the hamstrings during PS-ISO contractions of maximal and submaximal levels using two stretch amplitudes. Ten male participants (24.6 years ± 2.22 years) completed maximal and submaximal baseline isometric contractions at 90°, 120° and 150° knee flexion and PS-ISO contractions of maximal and submaximal intensity initiated at 90° and 120° incorporating active stretch of 30° and 60° at 60°·s−1. Torque and muscle activation of the knee flexors were simultaneously recorded. Musculotendinous unit behaviour of the biceps femoris long head was recorded via ultrasound during all PS-ISO contractions. Compared with baseline, torque was 8% and 39% greater in the maximal and submaximal PS-ISO conditions respectively with no change in muscle activation. The biceps femoris long head muscle lengthened during all PS-ISO contractions. PS-ISO contractions may be beneficial where the effects of highly controlled eccentric contractions and elevated isometric torque are desired, such as hamstring rehabilitation.

Details

Title: Maximal and submaximal isometric torque is elevated immediately following highly controlled active stretches of the hamstrings
Authors: Neil Chapman (Author) - Southern Cross University
John Whitting (Author) - Southern Cross University
Suzanne Broadbent (Author) - University of the Sunshine Coast, Queensland, School of Health and Sport Sciences - Legacy
Zachary Crowley-McHattan (Author) - Southern Cross University
Rudi Meir (Author) - Southern Cross University
Publication details: Journal of Electromyography and Kinesiology, Vol.56, pp.1-9
Publisher: Elsevier Ltd.
Date published: 2021
DOI: 10.1016/j.jelekin.2020.102500
ISSN: 1873-5711
Organisation Unit: School of Health - Sports & Exercise Science; School of Health and Behavioural Sciences - Legacy; School of Health and Sport Sciences - Legacy; University of the Sunshine Coast, Queensland; Cancer Research Cluster
Language: English
Record Identifier: 99489908802621
Output Type: Journal article

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Collaboration types: Domestic collaboration
Web Of Science research areas: Neurosciences; Physiology; Rehabilitation; Sport Sciences