Photobiomodulation Therapy at 808 nm Does Not Improve Biceps Brachii Performance to Exhaustion and Delayed-Onset Muscle Soreness in Young Adult Women: A Randomized, Controlled, Crossover Trial

Frontiers in Physiology, Vol. 12 (2021)

Keywords
Authors
  • Ricardo Henrique Esquivel Azuma
  • Center for Research in Health Sciences, University of Northern Paraná, Londrina, Brazil
  • Jeanne Karlette Merlo
  • Center for Research in Health Sciences, University of Northern Paraná, Londrina, Brazil
  • Jeferson Lucas Jacinto
  • Center for Research in Health Sciences, University of Northern Paraná, Londrina, Brazil
  • Jayne Maria Borim
  • Center for Research in Health Sciences, University of Northern Paraná, Londrina, Brazil
  • Rubens Alexandre da Silva
  • Département des Sciences de la Santé, Programme de Physiothérapie de L’université McGill Offert em Extension à L’Université du Québec à Chicoutimi, Saguenay, QC, Canada
  • Francis Lopes Pacagnelli
  • Faculty of Health Sciences, Physiotherapy Course, UNOESTE, Presidente Prudente, Brazil
  • Joao Pedro Nunes
  • Metabolism, Nutrition, and Exercise Laboratory, Physical Education and Sport Center, Londrina State University, Londrina, Brazil
  • Alex Silva Ribeiro
  • Center for Research in Health Sciences, University of Northern Paraná, Londrina, Brazil
  • Andreo Fernando Aguiar
  • Center for Research in Health Sciences, University of Northern Paraná, Londrina, Brazil

Abstract

ObjectiveThis study aims to investigate the effects of laser photobiomodulation (PBM) at 808 nm on biceps brachii performance to exhaustion, rating of perceived exertion (RPE), and delayed onset muscle soreness (DOMS) in untrained young women.MethodsThirteen young women (20.1 ± 2.9 years) participated in a crossover study in which they received, in a counterbalanced manner, active and placebo laser PBM on two occasions (T1 and T2), separated by a 7-day washout period. During T1 and T2, participants received active (100 mW output power, irradiance of 35.7 W cm–2, and total energy of 28 J/arm) or placebo laser irradiation on the biceps brachii muscle at 20 min before the repetitions-to-failure test [six sets at 60% of one-repetition maximum (1RM) until failure] for elbow flexion exercise. The number of repetitions performed and RPE over the six sets, as well as DOMS from basal up to 72 h after the repetitions-to-failure test, were recorded.ResultsThere was a significant (time, p < 0.05) reduction in the number of repetitions performed and an increase in RPE over six sets, with no statistical differences between placebo and active laser conditions (treatment × time, p > 0.05). DOMS increased at 24 h postexercise and progressively returned to baseline after 72 h in both conditions (time, p < 0.05; treatment × time, p > 0.05).ConclusionOur results indicate that acute laser PBM at 808 nm does not improve biceps brachii performance to exhaustion, RPE, and DOMS in untrained women.

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