Assessing the therapeutic effect of 625-nm light-emitting diodes

Zongzhen Mao; Guodong Xu; Yi Yang

doi:10.1117/12.2068764

17 September 2014 Assessing the therapeutic effect of 625-nm light-emitting diodes

Zongzhen Mao, Guodong Xu, Yi Yang

Proceedings Volume 9230, Twelfth International Conference on Photonics and Imaging in Biology and Medicine (PIBM 2014); 92301Q (2014) https://doi.org/10.1117/12.2068764
Event: Twelfth International Conference on Photonics and Imaging in Biology and Medicine (PIBM 2014), 2014, Wuhan, China

Abstract

To evaluate the effects of red Light-Emitting Diodes on elbow extensor and flexor strength and the recovery of exercise induced fatigue, the torque values from the isokinetic dynamometer as well as biochemistry parameters were used as outcome measures. A randomized double-blind placebo-controlled crossover trial was performed with twenty male young tennis athletes. Active LED therapy (LEDT, with wavelength 625nm, 10 minutes total irradiation time, irradiated area amount to 30cm², and 900J of total energy irradiated) or an identical placebo was delivered under double-blinded conditions to the left elbow just before exercise. The isokinetic muscle strength was measured immediately after irradiation. The blood lactate levels were sampled pre-exercise and post-exercise. The peak torque values of elbow extensor strength were significantly different between two groups. As in elbow flexor strength, the difference of peak torque was not significant. The blood lactate concentration of LEDT group post-exercise was significantly lower than those of placebo group. The results indicate that 625nm LED therapy is effective in preventing muscle fatigue as it can significantly reduce peak torque value of elbow extensors and blood lactate concentration. It has no effect on the strength of left elbow flexor or backhand performance in tennis.

Citation Download Citation

Zongzhen Mao, Guodong Xu, and Yi Yang "Assessing the therapeutic effect of 625-nm light-emitting diodes", Proc. SPIE 9230, Twelfth International Conference on Photonics and Imaging in Biology and Medicine (PIBM 2014), 92301Q (17 September 2014); https://doi.org/10.1117/12.2068764

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KEYWORDS

Light-emitting diode therapy

Blood

Light emitting diodes

Phototherapy

Biochemistry

Biomedical optics

Laser therapeutics

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