Effect of 830 nm low-level laser therapy in exercise-induced skeletal muscle fatigue in humans
Effect of 830 nm low-level laser therapy in exercise-induced skeletal muscle fatigue in humans
复制标题
DOI：
10.1007/s10103-008-0592-9
复制
发表时间：
2009-05-01
影响因子：
2.1
通讯作者：
Bjordal, Jan Magnus
中科院分区：
文献类型：
--
作者：
Pinto Leal Junior, Ernesto Cesar;Brandao Lopes-Martins, Rodrigo Alvaro;Bjordal, Jan Magnus
本研究旨在探讨830 nm低强度激光治疗（LLLT）对骨骼肌疲劳的影响。10名健康男性职业排球运动员进入交叉随机双盲安慰剂对照试验。活动LLLT（830 nm波长，100 mW输出，光斑大小0.0028 cm（2），总照射时间200 s）或相同的安慰剂LLLT在运动前立即输送到肱二头肌上的四个点。所有受试者进行肱二头肌的自主收缩，负荷为最大自主收缩力（MVC）的75%，直到筋疲力尽。主动LLLT后，平均重复次数显著高于安慰剂照射后[平均差异4.5，标准差（SD）+/- 6.0，P = 0.042]，运动后血乳酸水平升高，但治疗之间无显著差异。我们得出结论，830 nm LLLT可以延迟高强度运动中骨骼肌疲劳的发生，尽管血乳酸水平增加。
This study aimed to investigate the effect of 830 nm low-level laser therapy (LLLT) on skeletal muscle fatigue. Ten healthy male professional volleyball players entered a crossover randomized double-blinded placebo-controlled trial. Active LLLT (830 nm wavelength, 100 mW output, spot size 0.0028 cm(2), 200 s total irradiation time) or an identical placebo LLLT was delivered to four points on the biceps humeri muscle immediately before exercises. All subjects performed voluntary biceps humeri contractions with a load of 75% of the maximum voluntary contraction (MVC) force until exhaustion. After active LLLT the mean number of repetitions was significantly higher than after placebo irradiation [mean difference 4.5, standard deviation (SD) +/- 6.0, P = 0.042], the blood lactate levels increased after exercises, but there was no significant difference between the treatments. We concluded that 830 nm LLLT can delay the onset of skeletal muscle fatigue in high-intensity exercises, in spite of increased blood lactate levels.