Effects of photobiomodulation therapy (pulsed LASER 904 nm) on muscle oxygenation and performance in exercise-induced skeletal muscle fatigue in young women: a pilot study

Effects of photobiomodulation therapy (pulsed LASER 904 nm) on muscle oxygenation and performance in exercise-induced skeletal muscle fatigue in young women: a pilot study

Author Oliveira, Murilo Xavier Google Scholar
Toma, Renata Luri Autor UNIFESP Google Scholar
Jones, Brett J. L. Google Scholar
Cyprien, Thomas P. Google Scholar
Tier, Matthew R. Google Scholar
Wallace, Cameron A. Google Scholar
Renno, Ana Claudia Muniz Autor UNIFESP Google Scholar
Sabapathy, Surendran Google Scholar
Laakso, E-Liisa Google Scholar
Abstract Photobiomodulation therapy (PBMt) has been used to increase muscle performance and improve recovery when applied before exercise. We aimed to evaluate the effects of PBMt using LASER on muscle oxygenation and performance. The study was a randomized, participant and assessor-blinded, within-subject crossover trial with placebo control to test the viability of the methods. Five physically active young women were randomly assigned to either placebo, or active PBMt (12 diode cluster probe; 904 nm; 60 mW; 250 Hz; 43.2 J per site, 129.6 J total) in contact over rectus femoris (RF) muscle of the dominant limb immediately before an isokinetic fatigue protocol. A one-week wash-out period preceded cross-over. Electromyography and isokinetic performance measures were evaluated. Absolute concentrations of deoxygenated haemoglobin and myoglobin (deoxy[Hb + Mb]) of the RF, an index of local microvascular fractional O2 extraction, was monitored continuously by near-infrared spectroscopy (NIRS). Total haemoglobin concentration as an indicator of microvascular haematocrit was calculated as the sum of the deoxy[Hb + Mb] and oxy[Hb + Mb] signals. PBMt pre-conditioning reduced time to peak torque when compared to placebo (P<0.05). PBMt resulted in a noticeably reduced trend in deoxy[Hb + Mb] during exercise compared to placebo (P>0.05). PBMt before exercise improves indicators of muscle performance, potentially by increasing local matching of bulk and microvascular O2 delivery relative to skeletal muscle O2 utilisation. Further work is required to understand the effect of PBMt on haemodynamic and metabolic characteristics of muscle.
Keywords Photobiomodulation therapy
LASER therapy
Muscle fatigue
Deoxygenated haemoglobin
Muscle performance
Muscle oxygenation
xmlui.dri2xhtml.METS-1.0.item-coverage Bellingham
Language English
Date 2017
Published in Mechanisms Of Photobiomodulation Therapy Xii. Bellingham, v. 10048, p. -, 2017.
ISSN 0277-786X (Sherpa/Romeo, impact factor)
Publisher Spie-Int Soc Optical Engineering
Extent -
Origin https://dx.doi.org/10.1117/12.2253585
Access rights Closed access
Type Conference paper
Web of Science ID WOS:000407023900008
URI https://repositorio.unifesp.br/handle/11600/55498

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