Abstract：
Stretching programs are often used to improve muscle stiffness and thereby posterior shoulder tightness (PST); however, knowledge about their effects on the viscoelastic properties of muscles and performance is limited.
The aim of this study was to investigate the effects of a six-week stretching program on the viscoelastic properties of posterior shoulder muscles, shoulder functional performance and range of motion in volleyball players with PST.
A Randomized Controlled Trial.
Level II.
The study was conducted in 34 male (aged 19-26) professional volleyball players with PST. They were randomly assigned to stretching and control groups. A stretching routine (combining sleeper stretch and cross body stretch exercises) was performed in the stretching group for six weeks. Measurements were taken during the first assessment and six weeks after the initiation of stretching for the following: shoulder external/internal rotation range of motion, spike velocity, single arm seated shot-put test, and infraspinatus- posterior deltoid muscle stiffness (by shear wave elastography).
While the stretching group had statistically better results regarding increased shoulder internal rotation (p < 0.01), spike velocity (p = 0.02) and seated single arm shot put distance (p < 0.01), stretching did not have any effect on tissue stiffness.
A 6-week program of sleeper stretch, and cross body stretch exercises improved shoulder internal rotation and functional performance. A clinically meaningful change in muscle mechanical properties cannot be detected after a 6-week stretching program.
The aim of this study was to investigate the effects of a six-week stretching program on the viscoelastic properties of posterior shoulder muscles, shoulder functional performance and range of motion in volleyball players with PST.
A Randomized Controlled Trial.
Level II.
The study was conducted in 34 male (aged 19-26) professional volleyball players with PST. They were randomly assigned to stretching and control groups. A stretching routine (combining sleeper stretch and cross body stretch exercises) was performed in the stretching group for six weeks. Measurements were taken during the first assessment and six weeks after the initiation of stretching for the following: shoulder external/internal rotation range of motion, spike velocity, single arm seated shot-put test, and infraspinatus- posterior deltoid muscle stiffness (by shear wave elastography).
While the stretching group had statistically better results regarding increased shoulder internal rotation (p < 0.01), spike velocity (p = 0.02) and seated single arm shot put distance (p < 0.01), stretching did not have any effect on tissue stiffness.
A 6-week program of sleeper stretch, and cross body stretch exercises improved shoulder internal rotation and functional performance. A clinically meaningful change in muscle mechanical properties cannot be detected after a 6-week stretching program.
摘要：
背景：拉伸程序通常用于改善肌肉僵硬度，从而改善后肩紧绷度（PST）；但是，关于它们对肌肉粘弹性和性能的影响的知识是有限的。
目的：这项研究的目的是研究六周拉伸程序对肩后肌粘弹性的影响，PST排球运动员的肩部功能表现和运动范围。
方法：一项随机对照试验。
方法：二级。
方法：本研究对34名男性（19-26岁）职业排球运动员进行PST。他们被随机分配到拉伸组和对照组。在拉伸组中进行了为期六周的拉伸常规（结合卧铺拉伸和交叉身体拉伸练习）。在第一次评估期间和开始拉伸后六周进行以下测量：肩部外部/内部旋转运动范围，尖峰速度,单臂坐姿铅球测试，和脊柱下-后三角肌僵硬度（通过剪切波弹性成像）。
结果：虽然拉伸组在增加肩部内旋方面具有统计学上更好的结果（p<0.01），尖峰速度(p=0.02)和坐姿单臂铅球距离(p<0.01)，拉伸对组织硬度没有任何影响。
结论：为期6周的卧铺伸展计划，和交叉身体拉伸练习改善肩部内部旋转和功能表现。经过6周的拉伸程序后，无法检测到肌肉机械特性的临床意义变化。
目的：这项研究的目的是研究六周拉伸程序对肩后肌粘弹性的影响，PST排球运动员的肩部功能表现和运动范围。
方法：一项随机对照试验。
方法：二级。
方法：本研究对34名男性（19-26岁）职业排球运动员进行PST。他们被随机分配到拉伸组和对照组。在拉伸组中进行了为期六周的拉伸常规（结合卧铺拉伸和交叉身体拉伸练习）。在第一次评估期间和开始拉伸后六周进行以下测量：肩部外部/内部旋转运动范围，尖峰速度,单臂坐姿铅球测试，和脊柱下-后三角肌僵硬度（通过剪切波弹性成像）。
结果：虽然拉伸组在增加肩部内旋方面具有统计学上更好的结果（p<0.01），尖峰速度(p=0.02)和坐姿单臂铅球距离(p<0.01)，拉伸对组织硬度没有任何影响。
结论：为期6周的卧铺伸展计划，和交叉身体拉伸练习改善肩部内部旋转和功能表现。经过6周的拉伸程序后，无法检测到肌肉机械特性的临床意义变化。
