Cornell David J, Ebersole Kyle T
Int J Sports Phys Ther. 2020 Oct;15(5):732-743. doi: 10.26603/ijspt20200732.
In contrast to static stretching (SS), previous research has demonstrated increases in flexibility after an acute bout of self-myofascial release (SMR) without any subsequent decreases in force output. Previous research has utilized measures of surface electromyography (sEMG) and mechanomyography (MMG) to examine the influence of SS on the electrical and mechanical processes of muscle activation, respectively. However, there is a lack of research examining the potential changes in electro-mechanical muscle activation post-SMR.
To examine the influence of SMR, via an acute bout of foam rolling (FR) to the vastus lateralis (VL), on the expression of knee extension force output and the inter-muscular electro-mechanical activation of the quadriceps musculature.
Randomized crossover trial.
Twenty (10 males, 10 females) recreationally-active participants with prior FR experience completed both SMR and control (CON) testing protocols during separate testing sessions that were conducted in a randomized order 48 hours apart. During the SMR protocol, participants performed 3 sets of 60 seconds of FR over the VL portion of their quadriceps musculature, with 60 seconds of rest between sets. During the CON protocol, participants quietly sat upright for 10 minutes. Peak knee extension force output -(Force) data, as well as sEMG and MMG data from the VL and the rectus femoris (RF) were collected during maximal voluntary isometric contractions (MVICs) before and after both testing protocols. Root mean square sEMG and MMG amplitudes were calculated to represent electro-mechanical muscle activation of the VL (VL-sEMG, VL-MMG) and RF (RF-sEMG, RF-MMG) musculature.
Repeated measures analyses of variance (RM ANOVAs) identified a significant ( < 0.05) increase in Force within the SMR protocol among males, but no change among females. No statistically significant changes in any electro-mechanical muscle activation measures were identified pre-to-post-SMR within either sex.
In contrast to the SS literature body, these results suggest that SMR does not influence the electro-mechanical aspects of muscle activation during MVICs. These results provide support for the absence of decreases in force output post-SMR, but further examination regarding the potential muscle mass influence of SMR on electro-mechanical muscle function remains warranted.
2c.
与静态拉伸（SS）相比，先前的研究表明，在进行一次急性自我肌筋膜放松（SMR）后，柔韧性会增加，且随后的力量输出不会降低。先前的研究利用表面肌电图（sEMG）和机械肌电图（MMG）测量方法，分别研究了SS对肌肉激活的电过程和机械过程的影响。然而，缺乏研究探讨SMR后肌肉机电激活的潜在变化。
通过对股外侧肌（VL）进行一次急性泡沫轴滚动（FR），研究SMR对膝关节伸展力量输出表达以及股四头肌肌群肌肉间机电激活的影响。
随机交叉试验。
20名（10名男性，10名女性）有FR经验的休闲活动参与者，在相隔48小时、随机顺序进行的单独测试环节中，完成了SMR和对照（CON）测试方案。在SMR方案中，参与者在股四头肌肌群的VL部分进行3组，每组60秒的FR，组间休息60秒。在CON方案中，参与者安静地直立坐10分钟。在两个测试方案前后的最大自主等长收缩（MVIC）过程中，收集膝关节伸展峰值力量输出-（力量）数据，以及来自VL和股直肌（RF）的sEMG和MMG数据。计算均方根sEMG和MMG振幅，以代表VL（VL-sEMG，VL-MMG）和RF（RF-sEMG，RF-MMG）肌群的肌肉机电激活。
重复测量方差分析（RM ANOVA）发现，SMR方案中男性的力量有显著（<0.05）增加，但女性没有变化。在任何一种性别中，SMR前后均未发现任何肌肉机电激活测量有统计学显著变化。
与SS文献不同，这些结果表明，SMR不会影响MVIC期间肌肉激活的机电方面。这些结果为SMR后力量输出不降低提供了支持，但关于SMR对肌肉机电功能的潜在肌肉质量影响仍需进一步研究。
2c。
