斜方肌粘弹性特性受偏心运动的影响具有异质性。
Trapezius viscoelastic properties are heterogeneously affected by eccentric exercise.
机构信息
Department of Paralympics Sports, University School of Physical Education, Poland.
Department of Athletes Motor Skills, University School of Physical Education, Poland.
出版信息
J Sci Med Sport. 2018 Aug;21(8):864-869. doi: 10.1016/j.jsams.2018.01.005. Epub 2018 Feb 1.
OBJECTIVES
The aim of this study was to investigate the influence of eccentric exercise (ECC) on the spatial mapping of muscle stiffness and creep of the upper trapezius, using a quantitative myotonometry device.
DESIGN
Two groups of 16 subjects participated in the experimental sessions. In part A, the test-retest reliabilities of muscle stiffness and creep were assessed. In part B, muscle stiffness and muscle creep were mapped before, immediately after and 24h after ECC when post-exercise soreness had developed.
METHODS
The ECC protocol consisted of 50 eccentric contractions divided into 5 bouts of 10 contractions at maximum force level.
RESULTS
The relative reliabilities of stiffness and creep measurements were found to be substantial to almost perfect. Muscle stiffness for musculotendinous sites increased at 24h after ECC while it decreased for muscle belly immediately after and 24h after ECC. Muscle creep for musculotendinous sites decreased, and for muscle belly sites increased, immediately after and 24h after ECC.
CONCLUSIONS
For the first time, the present study showed sign of discrepancies in the effects of ECC on muscle stiffness and creep, underlining opposite changes in the musculotendinous and muscle belly viscoelastic properties of upper trapezius.
目的
本研究旨在使用定量肌振仪研究离心运动（ECC）对上斜方肌肌肉僵硬和蠕变的空间映射的影响。
设计
两组 16 名受试者参加了实验部分。在 A 部分，评估了肌肉僵硬和蠕变的测试-再测试可靠性。在 B 部分，在出现运动后酸痛后，ECC 之前、之后立即以及 24 小时后，对肌肉僵硬和肌肉蠕变进行了映射。
方法
ECC 方案包括 50 次离心收缩，分为 5 组，每组 10 次最大力量水平。
结果
发现僵硬和蠕变测量的相对可靠性从很大到几乎完美。ECC 后 24 小时，肌筋膜部位的肌肉僵硬增加，而 ECC 后即刻和 24 小时后肌肉腹部的肌肉僵硬减少。ECC 后即刻和 24 小时后，肌筋膜部位的肌肉蠕变减少，而肌肉腹部部位的肌肉蠕变增加。
结论
本研究首次表明，ECC 对肌肉僵硬和蠕变的影响存在差异，突出了上斜方肌肌筋膜和肌肉腹部粘弹性特性的相反变化。
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