Leal Junior Ernesto Cesar Pinto, Lopes-Martins Rodrigo Alvaro Brandão, Rossi Rafael Paolo, De Marchi Thiago, Baroni Bruno Manfredini, de Godoi Vanessa, Marcos Rodrigo Labat, Ramos Luciano, Bjordal Jan Magnus
Laboratory of Human Movement (LMH), University of Caxias do Sul (UCS), Caxias do Sul, RS, Brazil.
Lasers Surg Med. 2009 Oct;41(8):572-7. doi: 10.1002/lsm.20810.
There are some indications that low-level laser therapy (LLLT) may delay the development of skeletal muscle fatigue during high-intensity exercise. There have also been claims that LED cluster probes may be effective for this application however there are differences between LED and laser sources like spot size, spectral width, power output, etc. In this study we wanted to test if light emitting diode therapy (LEDT) can alter muscle performance, fatigue development and biochemical markers for skeletal muscle recovery in an experimental model of biceps humeri muscle contractions.
STUDY DESIGN/MATERIALS AND METHODS: Ten male professional volleyball players (23.6 [SD +/-5.6] years old) entered a randomized double-blinded placebo-controlled crossover trial. Active cluster LEDT (69 LEDs with wavelengths 660/850 nm, 10/30 mW, 30 seconds total irradiation time, 41.7 J of total energy irradiated) or an identical placebo LEDT was delivered under double-blinded conditions to the middle of biceps humeri muscle immediately before exercise. All subjects performed voluntary biceps humeri contractions with a workload of 75% of their maximal voluntary contraction force (MVC) until exhaustion.
Active LEDT increased the number of biceps humeri contractions by 12.9% (38.60 [SD +/-9.03] vs. 34.20 [SD +/-8.68], P = 0.021) and extended the elapsed time to perform contractions by 11.6% (P = 0.036) versus placebo. In addition, post-exercise levels of biochemical markers decreased significantly with active LEDT: Blood Lactate (P = 0.042), Creatine Kinase (P = 0.035), and C-Reative Protein levels (P = 0.030), when compared to placebo LEDT.
We conclude that this particular procedure and dose of LEDT immediately before exhaustive biceps humeri contractions, causes a slight delay in the development of skeletal muscle fatigue, decreases post-exercise blood lactate levels and inhibits the release of Creatine Kinase and C-Reative Protein. Lasers Surg. Med. 41:572-577, 2009. (c) 2009 Wiley-Liss, Inc.
有迹象表明，低强度激光疗法（LLLT）可能会延缓高强度运动期间骨骼肌疲劳的发展。也有说法称，LED簇状探头可能对此应用有效，然而LED和激光源在光斑大小、光谱宽度、功率输出等方面存在差异。在本研究中，我们想测试发光二极管疗法（LEDT）是否能在肱二头肌收缩的实验模型中改变肌肉性能、疲劳发展以及骨骼肌恢复的生化标志物。
研究设计/材料与方法：10名男性职业排球运动员（23.6[标准差±5.6]岁）进入一项随机双盲安慰剂对照交叉试验。在双盲条件下，在运动前立即将有源簇状LEDT（69个LED，波长660/850nm，10/30mW，总照射时间30秒，总照射能量41.7J）或相同的安慰剂LEDT施加于肱二头肌中部。所有受试者以其最大自主收缩力（MVC）的75%的工作量进行肱二头肌自主收缩，直至疲劳。
与安慰剂相比，有源LEDT使肱二头肌收缩次数增加了12.9%（38.60[标准差±9.03]对34.20[标准差±8.68]，P = 0.021），并使进行收缩的持续时间延长了11.6%（P = 0.036）。此外，与安慰剂LEDT相比，有源LEDT使运动后生化标志物水平显著降低：血乳酸（P = 0.042）、肌酸激酶（P = 0.035）和C反应蛋白水平（P = 0.030）。
我们得出结论，在进行力竭性肱二头肌收缩之前立即采用这种特定的LEDT程序和剂量，会导致骨骼肌疲劳发展略有延迟，降低运动后血乳酸水平，并抑制肌酸激酶和C反应蛋白的释放。《激光外科与医学》41:572 - 577，2009年。（c）2009威利 - 利斯公司。
