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Proceedings Paper

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(s): Murilo X. Oliveira; Renata L. Toma; Brett J. L. Jones; Thomas P. Cyprien; Matthew R. Tier; Cameron A. Wallace; Ana C. M. Renno; Surendran Sabapathy; E-Liisa Laakso
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Paper 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.

Paper Details

Date Published: 17 February 2017
PDF: 9 pages
Proc. SPIE 10048, Mechanisms of Photobiomodulation Therapy XII, 100480J (17 February 2017); doi: 10.1117/12.2253585
Show Author Affiliations
Murilo X. Oliveira, Federal Univ. of Jequitinhonha and Mucuri Valleys (Brazil)
Renata L. Toma, Univ. Federal de São Paulo (Brazil)
Brett J. L. Jones, Griffith Univ. (Australia)
Thomas P. Cyprien, Griffith Univ. (Australia)
Matthew R. Tier, Griffith Univ. (Australia)
Cameron A. Wallace, Griffith Univ. (Australia)
Ana C. M. Renno, Univ. Federal de São Paulo (Brazil)
Surendran Sabapathy, Griffith Univ. (Australia)
E-Liisa Laakso, Griffith Univ. (Australia)

Published in SPIE Proceedings Vol. 10048:
Mechanisms of Photobiomodulation Therapy XII
Michael R. Hamblin; James D. Carroll; Praveen Arany, Editor(s)

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