Abstract
The purpose of this study was to verify the photobiomodulation therapy (PBMT) effects with different doses on neuromuscular economy during submaximal running tests. Eighteen male recreational runners participate in a randomized, double-blind, and placebo-controlled trial, which each participant was submitted to the same testing protocol in five conditions: control, placebo, and PBMT with doses of 15, 30, and 60 J per site (14 sites in each lower limb). The submaximal running was performed at 8 and 9 km h−1 during 5 min for each velocity. Muscle activation of the vastus lateralis (VL), vastus medialis (VM), rectus femoris (RF), biceps femoris (BF), and gastrocnemius lateralis (GL) was collected during the last minute of each running test. The root mean square (RMS) was normalized by maximal isometric voluntary contraction (MIVC) performed a priori in an isokinetic dynamometer. The RMS sum of all muscles (RMSLEG) was considered as main neuromuscular economy parameter. PBMT with doses of 15, 30, and 60 J per site [33 diodes = 5 lasers (850 nm), 12 LEDs (670 nm), 8 LEDs (880 nm), and 8 LEDs (950 nm)] or placebo applications occurred before running tests. For the statistical analysis, the effect size was calculated. Moreover, a qualitative inference was used to determine the magnitude of differences between groups. Peak torque and RMS during MIVCs showed small effect sizes. According to magnitude-based inference, PBMT with dose of 15 J per site showed possibly and likely beneficial effects on neuromuscular economy during running at 8 and 9 km h−1, respectively. On other hand, PBMT with doses of 30 and 60 J per site showed possible beneficial effects only during running at 9 km h−1. We concluded that PBMT improve neuromuscular economy and the best PBMT dose was 15 J per site (total dose of 420 J).
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This study was supported in part by National Council for Scientific and Technological Development (CNPq, Brazil).
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Ethical approval was obtained from the local Human Research Ethics Committee (CAAE: 61599116.1.0000.0121) and the protocol was written in accordance with the standards of the 1964 Declaration of Helsinki and its later amendments.
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Informed consent was obtained from all individual participants included in the present study.
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Dellagrana, R.A., Rossato, M., Sakugawa, R.L. et al. Dose-response effect of photobiomodulation therapy on neuromuscular economy during submaximal running. Lasers Med Sci 33, 329–336 (2018). https://doi.org/10.1007/s10103-017-2378-4
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DOI: https://doi.org/10.1007/s10103-017-2378-4