Muscle and joint responses during and after static stretching performed at different intensities
Muscle and joint responses during and after static stretching performed at different intensities
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DOI：
10.1007/s00421-015-3104-1
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发表时间：
2015-06-01
影响因子：
3
通讯作者：
Nordez, Antoine
中科院分区：
文献类型：
--
作者：
Freitas, Sandro R.;Andrade, Ricardo J.;Nordez, Antoine
我们研究了不同强度的跖屈肌静态拉伸对内侧腓肠肌（GAS）剪切弹性模量、GAS束长度和拉伸前后踝关节被动扭矩-角响应的影响。参与者进行了三次不同强度的拉伸：40% （R40）最大背屈运动范围（ROM）， 60% （R60）最大背屈运动范围和80% （R80）最大背屈运动范围。每次拉伸持续10分钟。在拉伸前、拉伸期间和拉伸后分别评估GAS结构、GAS剪切弹性模量、踝关节被动扭矩角和肌肉活动。绝对和相对（即归一化到静态拉伸起始值）气体剪切弹性模量弛豫随拉伸强度的变化而变化。绝对被动扭矩松弛随强度变化（p < 0.05），但归一化到拉伸起始值时没有变化。拉伸过程中GAS束长度无明显变化（p = 0.93）。拉伸后，R60 [-0.99 +/- a 0.59 Nm (-6.5 +/- a 3.8%), p < 0.001]和R80 [-1.05 +/- a 1.12 Nm (-6.8 +/- a 6.3%), p = 0.004]在给定角度的被动扭矩显著降低，气体剪切弹性模量仅R80 [-9.3 +/- a 7.2 kPa (- 14.1%), p = 0.003]。在GAS剪切弹性模量或踝关节被动扭矩变量中，拉伸过程中的松弛幅度与拉伸后效应之间没有显著相关性。剪切弹性模量与踝关节被动扭矩响应在拉伸过程和拉伸后无显著关系。拉伸对关节被动扭矩的影响并不反映腓肠肌内侧剪切弹性模量的变化，这些对拉伸的响应取决于其强度。
We investigated the effects of plantarflexor static stretching of different intensities on the medial gastrocnemius (GAS) shear elastic modulus, GAS fascicle length and ankle passive torque-angle responses during and after stretching.Participants performed three stretching sessions of different intensities: 40 % (R40) of maximal dorsiflexion range of motion (ROM), 60 % (R60) of ROM, and 80 % (R80) of ROM. Each stretching lasted 10 min. The GAS architecture, GAS shear elastic modulus, ankle passive torque-angle, and muscle activity were assessed before, during, and after the stretching.The absolute and relative (i.e., normalized to the static stretching start value) GAS shear elastic modulus relaxation varied across stretching intensities. The absolute passive torque relaxation varied across intensities (p < 0.05) but not when normalized to the stretching start value. No significant changes were observed in GAS fascicle length during the stretching (p = 0.93). After stretching, passive torque at a given angle was significantly decreased for R60 [-0.99 +/- A 0.59 Nm (-6.5 +/- A 3.8 %), p < 0.001] and R80 [-1.05 +/- A 1.12 Nm (-6.8 +/- A 6.3 %), p = 0.004], and GAS shear elastic modulus decreased only for the R80 [-9.3 +/- A 7.2 kPa (-14.1 %), p = 0.003]. No significant correlations were found between the magnitude of relaxation during stretching and post-stretching effect in the GAS shear elastic modulus or ankle passive torque variables. No significant relation was found between the shear elastic modulus and the ankle passive torque responses during and after stretching.The effects of stretching on joint passive torque do not reflect changes in the medial gastrocnemius shear elastic modulus, and these responses to stretching depend on its intensity.