Leal Junior Ernesto Cesar Pinto, Lopes-Martins Rodrigo Alvaro Brandão, Baroni Bruno Manfredini, De Marchi Thiago, Rossi Rafael Paolo, Grosselli Douglas, Generosi Rafael Abeche, de Godoi Vanessa, Basso Maira, Mancalossi José Luis, Bjordal Jan Magnus
Laboratory of Human Movement, University of Caxias do Sul, Caxias do Sul, RS, Brazil.
Photomed Laser Surg. 2009 Aug;27(4):617-23. doi: 10.1089/pho.2008.2350.
There is anecdotal evidence that low-level laser therapy (LLLT) may affect the development of muscular fatigue, minor muscle damage, and recovery after heavy exercises. Although manufacturers claim that cluster probes (LEDT) maybe more effective than single-diode lasers in clinical settings, there is a lack of head-to-head comparisons in controlled trials. This study was designed to compare the effect of single-diode LLLT and cluster LEDT before heavy exercise.
This was a randomized, placebo-controlled, double-blind cross-over study. Young male volleyball players (n = 8) were enrolled and asked to perform three Wingate cycle tests after 4 x 30 sec LLLT or LEDT pretreatment of the rectus femoris muscle with either (1) an active LEDT cluster-probe (660/850 nm, 10/30 mW), (2) a placebo cluster-probe with no output, and (3) a single-diode 810-nm 200-mW laser.
The active LEDT group had significantly decreased post-exercise creatine kinase (CK) levels (-18.88 +/- 41.48 U/L), compared to the placebo cluster group (26.88 +/- 15.18 U/L) (p < 0.05) and the active single-diode laser group (43.38 +/- 32.90 U/L) (p < 0.01). None of the pre-exercise LLLT or LEDT protocols enhanced performance on the Wingate tests or reduced post-exercise blood lactate levels. However, a non-significant tendency toward lower post-exercise blood lactate levels in the treated groups should be explored further.
In this experimental set-up, only the active LEDT probe decreased post-exercise CK levels after the Wingate cycle test. Neither performance nor blood lactate levels were significantly affected by this protocol of pre-exercise LEDT or LLLT.
有轶事证据表明，低强度激光疗法（LLLT）可能会影响肌肉疲劳的发展、轻微肌肉损伤以及高强度运动后的恢复。尽管制造商声称，在临床环境中，集群探头（LEDT）可能比单二极管激光器更有效，但在对照试验中缺乏直接比较。本研究旨在比较高强度运动前单二极管LLLT和集群LEDT的效果。
这是一项随机、安慰剂对照、双盲交叉研究。招募了年轻男性排球运动员（n = 8），并要求他们在股直肌接受4×30秒的LLLT或LEDT预处理后进行三次温盖特自行车测试，预处理方式为：（1）有源LEDT集群探头（660/850纳米，10/30毫瓦），（2）无输出的安慰剂集群探头，（3）810纳米200毫瓦的单二极管激光器。
与安慰剂集群组（26.88±15.18 U/L）（p < 0.05）和有源单二极管激光组（43.38±32.90 U/L）（p < 0.01）相比，有源LEDT组运动后肌酸激酶（CK）水平显著降低（-18.88±41.48 U/L）。运动前的LLLT或LEDT方案均未提高温盖特测试的成绩，也未降低运动后血乳酸水平。然而，治疗组运动后血乳酸水平有降低的趋势，但不显著，应进一步探讨。
在本实验设置中，只有有源LEDT探头在温盖特自行车测试后降低了运动后CK水平。运动前LEDT或LLLT方案对运动成绩和血乳酸水平均无显著影响。
