Effect of low-level laser (Ga-Al-As 655 nm) on skeletal muscle fatigue induced by electrical stimulation in rats

Journal of Applied Physiology
Rodrigo Alvaro B Lopes-MartinsJan Magnus Bjordal

Abstract

We investigated whether low-level laser therapy (LLLT) can reduce muscular fatigue during tetanic contractions in rats. Thirty-two male Wistar rats were divided into four groups receiving either one of three different LLLT doses (0.5, 1.0, and 2.5 J/cm2) or a no-treatment control group. Electrical stimulation was used to induce six tetanic muscle contractions in the tibial anterior muscle. Contractions were stopped when the muscle force fell to 50% of the initial value for each contraction (T50%). There was no significant difference between the 2.5 J/cm2 laser-irradiated group and the control group in mean T50% values. Laser-irradiated groups (0.5 and 1.0 J/cm2) had significantly longer T50% values than the control group. The relative peak force for the sixth contraction in the laser-irradiated groups were significantly higher at 92.2% (SD 12.6) for 0.5 J/cm2, 83.2% (SD 20.5) for 1.0 J/cm2, and 82.9% (SD 18.3) for 2.5 J/cm2 than for the control group [50% (SD 15)]. Laser groups receiving 0.5 and 1.0 J/cm2 showed significant increases in mean performed work compared with both the control group and their first contraction values. Muscle damage was indirectly measured by creatine kinase levels in plasma. A distinct dose-response p...Continue Reading

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Citations

Jun 11, 2011·Supportive Care in Cancer : Official Journal of the Multinational Association of Supportive Care in Cancer·Jan Magnus BjordalRodrigo Ab Lopes-Martins
May 7, 2011·Lasers in Medical Science·Jon JoensenJan Magnus Bjordal
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Aug 25, 2009·Photomedicine and Laser Surgery·Xiao-Guang LiuJian-Qin Yuan
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