The acute and prolonged effects of 20-s static stretching on muscle strength and shear elastic modulus
The acute and prolonged effects of 20-s static stretching on muscle strength and shear elastic modulus
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DOI：
10.1371/journal.pone.0228583
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发表时间：
2020-02-06
期刊：
影响因子：
3.7
通讯作者：
Nakamura, Masatoshi
中科院分区：
文献类型：
--
作者：
Sato, Shigeru;Kiyono, Ryosuke;Nakamura, Masatoshi
静态拉伸（SS）通常作为热身程序的一部分进行。然而，只有少数以前的研究报告的影响，短时间的SS，这是经常使用在体育领域。本研究的目的是调查的急性和长期的影响，20秒SS的等速收缩肌肉力量，运动范围（ROM），和剪切弹性modules.MethodTwenty男性志愿者参加了这项研究。使用测力计测量ROM以及向心性和离心性收缩肌力。此外，利用超声剪切波弹性成像技术测量优势腿腓肠肌内侧肌的剪切弹性模量。参与者四次访问实验室，每次间隔> 3天。第一次访问是熟悉试验，随后的三次访问包括随机顺序的以下实验条件。所有的测量之前，并立即进行后SS或5分钟和10分钟后，20秒SS.ResultsThe研究结果表明，ROM显着增加SS干预在所有条件下相比，之前SS干预。此外，SS后和SS后5 min的ROM显著高于SS后10 min。然而，有没有显着的交互作用的等速收缩肌肉力量和剪切弹性模量。结论在运动场上，从性能的角度来看，20秒的SS干预可能是一个有用的技术，运动前，因为它增加了ROM和不降低最大扭矩。
IntroductionStatic 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.MethodTwenty 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.ResultsThe 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 modulusConclusionIn 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.