Borges Lucio Santos, Cerqueira Mikhail Santos, dos Santos Rocha José Alberto, Conrado Luis Augusto Lupato, Machado Marco, Pereira Rafael, Pinto Neto Osmar
Department of Biological Sciences, State University of Southwest Bahia (UESB), Jequie, 45210-506, Bahia, Brazil.
Lasers Med Sci. 2014 May;29(3):1139-44. doi: 10.1007/s10103-013-1486-z. Epub 2013 Nov 21.
The goal of the present study was to determine the effect of light-emitting diode phototherapy (LEDT) at 630 nm on muscle recovery after a damaging eccentric exercise bout. Seventeen healthy young male volunteers, without previous experience with eccentric exercise, were included in a randomized double-blinded placebo-controlled trial. They were divided into a LEDT (n = 8) and a PLACEBO group (n = 9). To induce muscle damage, subjects performed 30 eccentric contractions with a load of 100 % of maximal voluntary isometric contraction strength of the elbow flexors of the non-dominant arm. LEDT group subjects received biceps brachii phototherapy (λ 630 nm; total energy density, 20.4 J/cm2) immediately after the exercise bout. The LEDT in the placebo group was aimed at the muscle, but it remained turned off. Isometric muscle strength, muscle soreness, and elbow range of motion (ROM) were measured before and at 24, 48, 72, and 96 h the after eccentric exercise bout and compared between groups. Our results showed that the muscle soreness, muscle strength loss, and ROM impairments were significantly reduced up to 96 h after a damaging eccentric exercise bout for the LEDT group compared with the PLACEBO group. A single LEDT (630 nm) intervention immediately after a damaging eccentric exercise bout was effective in terms of attenuating the muscle soreness and muscle strength loss and ROM impairments.
本研究的目的是确定630nm发光二极管光疗（LEDT）对一次损伤性离心运动后肌肉恢复的影响。17名无离心运动经验的健康年轻男性志愿者被纳入一项随机双盲安慰剂对照试验。他们被分为LEDT组（n = 8）和安慰剂组（n = 9）。为诱导肌肉损伤，受试者以非优势臂肘屈肌最大自主等长收缩力量的100%为负荷进行30次离心收缩。LEDT组受试者在运动后立即接受肱二头肌光疗（波长630nm；总能量密度，20.4J/cm2）。安慰剂组的LED灯对准肌肉，但保持关闭状态。在离心运动前后以及运动后24、48、72和96小时测量等长肌肉力量、肌肉酸痛和肘关节活动范围（ROM），并在组间进行比较。我们的结果表明，与安慰剂组相比，LEDT组在损伤性离心运动后长达96小时，肌肉酸痛、肌肉力量损失和ROM损伤均显著减轻。一次损伤性离心运动后立即进行单次LEDT（630nm）干预，在减轻肌肉酸痛、肌肉力量损失和ROM损伤方面是有效的。
