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The Acute and Prolonged Effects of 20-s Static Stretching on Muscle Strength and Shear Elastic Modulus

Overview
Journal PLoS One
Date 2020 Feb 7
PMID 32027694
Citations 30
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Abstract

Introduction: Static stretching (SS) is commonly performed as part of warm-up routine. However, only few previous studies have reported on the effects of short-duration SS, which is often used in the sports field. The purpose of this study was to investigate the acute and prolonged effects of 20-s SS on isokinetic contraction muscle strength, range of motion (ROM), and the shear elastic modulus.

Method: Twenty male volunteers participated in this study. The ROM and both concentric and eccentric contraction muscle strengths were measured using a dynamometer. In addition, the shear elastic modulus of medial gastrocnemius muscle in dominant leg was measured by ultrasonic shear wave elastography. The participants visited the laboratory on four occasions each separated by >3 days. The first visit was a familiarization trial, and the subsequent three visits included the following experimental conditions in a random order. All measurements were performed prior to and immediately after SS or 5 min and 10 min after 20-s SS.

Results: The results of this study showed that the ROM was significantly increased SS intervention in all conditions compared with prior to SS intervention. In addition, ROM was significantly higher post SS and 5 min after SS than 10 min after SS. However, there were no significant interaction effects for isokinetic contraction muscle strength and the shear elastic modulus.

Conclusion: In the sports field, from the point of performance, a 20-s SS intervention could be a useful technique before exercise because it increases ROM and does not decrease maximum torque.

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