Effects of static stretching duration on muscle stiffness and blood flow in the rectus femoris in adolescents
Effects of static stretching duration on muscle stiffness and blood flow in the rectus femoris in adolescents
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DOI：
10.11152/mu-1859
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发表时间：
2019-01-01
影响因子：
1.7
通讯作者：
Adaletli, Ibrahim
中科院分区：
文献类型：
--
作者：
Caliskan, Emine;Akkoc, Orkun;Adaletli, Ibrahim
目的：采用剪切波弹性成像（SWE）和超微血管成像（SMI）比较2 min和5 min被动静态拉伸（SS）对青少年运动员股直肌僵硬度和血流的影响。材料和方法：这项前瞻性研究包括20名男性运动员，中位年龄为14.5（12.5-16.5）岁。受试者根据SS持续时间分为2 min组（n=10）和5 min组（n=10）。在休息时和2分钟和5分钟的SS后，刚度和血流值进行了比较，在股直肌为每组。还分析了操作员间的可靠性。结果：静息和SS 2 min之间的僵硬度无显著差异。从休息到SS 5 min，刚度值显著降低。从静息到SS 2和5 min，血流量显著增加。SWE和SMI测量的操作员间可靠性为中等至完美（ICC：0.52-0.83）。结论：SWE和SMI可用于青少年肌肉僵硬度和血流量的定量研究。虽然刚度参数显着下降，从休息后，只有5分钟，血流量显着增加后，2和5分钟。对于物理康复方案，5分钟的SS可以选择，以减少刚度。对于比赛，2分钟的SS可能足以进行热身运动，因为它最佳地增加了血流量。5分钟的SS可能是最好的冷却运动，以促进恢复。
Aims: To compare the effects of 2 and 5 min of passive static stretching (SS) on stiffness and blood flow in the rectus femoris in adolescent athletes using shear wave elastography (SWE) and superb microvascular imaging (SMI). Material and methods: This prospective study included 20 male athletes with median age of 14.5 (12.5-16.5) years. The subjects were divided into two groups based on the SS duration as follows: 2 min (n=10) and 5 min (n=10). At rest and after 2 and 5 min of SS, stiffness and blood flow values were compared in the rectus femoris for each group. Inter-operator reliability was also analysed. Results: There was no significant difference between resting and 2 min of SS in terms of stiffness. The stiffness values decreased significantly from resting to 5 min of SS. The blood flow increased significantly from resting to 2 and 5 min of SS. Inter-operator reliability was moderate to perfect for SWE and SMI measurements (ICC: 0.52-0.83). Conclusions: SWE and SMI can be used to acquire reliable quantitative data about muscle stiffness and blood flow in adolescents. While stiffness parameters significantly decreased from resting after only 5 min, blood flow significantly increased both after 2 and 5 min. For physical rehabilitation protocols, 5 min of SS may be chosen to reduce stiffness. For competitions, 2 min of SS may be sufficient for warm-up exercise because it increases the blood flow optimally. Five min of SS may be preferred for the cool-down exercise to enhance recovery.