目标:弹性成像技术的最新进展,特别是超声剪切波弹性成像(SWE),能够对肌肉僵硬进行非侵入性评估。然而,在训练有素的个体中,关于偏心运动诱发的肌肉损伤(EIMD)的即时和短期影响的研究有限.这项研究旨在通过超声剪力波成像(SSI)以及酸痛和肘部屈曲最大自愿性等距收缩(MVIC)来跟踪偏心训练对肱二头肌刚度的影响。立即干预后,在10分钟,48h,和96小时在训练有素的男人。
方法:13名训练有素的男性参加了这项研究。弹性成像图像的基线测量,肘屈肌的MVIC,并获得肌肉酸痛。参与者对测功机进行了偏心运动方案(4组X10次重复),运动后立即重复进行等速和弹性成像测量,在10分钟,48h,96小时
结果:在运动后10分钟立即观察到刚度(通过剪切模量(µ)测量)的显着降低。MVIC在之后立即表现出显著下降,10分钟,和48小时相比,基线测量。肌肉酸痛在48h达到峰值,坚持到96小时。
结论:训练有素的男性在偏心运动后立即降低BB刚度和MVIC,提示机械应力和肌节破裂的潜在参与。与未经训练的个体相比,受过训练的个体可能对EIMD表现出明显的反应,强调弹性成像在监测高强度运动后急性生物力学变化中的适用性。
OBJECTIVE: Recent advancements in elastography techniques, specifically supersonic shearwave elastography (SWE), have enabled non-invasive assessment of muscle stiffness. However, there is limited research on the immediate and short-term effects of eccentric exercise-induced muscle damage (EIMD) in well-trained individuals. This study aimed to follow up on the effects of eccentric training on the biceps brachialis stiffness by supersonic shearwave imaging (SSI) as well as the soreness and elbow flexion maximal voluntary isometric contraction (MVIC), immediately post-intervention, at 10 min, 48 h, and 96 h in well-trained men.
METHODS: Thirteen well-trained males participated in the study. Baseline measurements of elastography images, MVIC of the elbow flexors, and muscle soreness were obtained. The participants performed an eccentric exercise protocol (4 sets X 10 repetitions) on the dynamometer isokinetic and elastography measurements were repeated immediately post-exercise, at 10 min, 48 h, and 96 h.
RESULTS: Significant reductions in stiffness (measured by shear modulus (µ)) were observed immediately and at 10 min post-exercise. MVIC exhibited significant reductions immediately after, 10 min, and 48 h compared to baseline measurements. Muscle soreness peaked at 48 h, persisting until 96 h.
CONCLUSIONS: The BB stiffness and MVIC reduction immediately post-eccentric exercise in well-trained men, suggest the potential involvement of mechanical stress and sarcomere rupture. Trained individuals may exhibit a distinct response to EIMD compared to untrained individuals, highlighting the applicability of elastography in monitoring acute biomechanical changes following high-intensity exercise.