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Acute Photobiomodulation by LED Does Not Alter Muscle Fatigue and Cycling Performance

dc.contributor.authorDutra, Yago Medeiros [UNESP]
dc.contributor.authorClaus, Gabriel MacHado [UNESP]
dc.contributor.authorMalta, Elvis De Souza [UNESP]
dc.contributor.authorBrisola, Gabriel Motta Pinheiro [UNESP]
dc.contributor.authorEsco, Michael R.
dc.contributor.authorFerraresi, Cleber
dc.contributor.authorZagatto, Alessandro Moura [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionUniversity of Alabama
dc.contributor.institutionUniversidade Brasil
dc.date.accessioned2021-06-25T10:12:28Z
dc.date.available2021-06-25T10:12:28Z
dc.date.issued2020-11-01
dc.description.abstractPurpose The purpose of the present study was to investigate the ergogenic effects of two doses of photobiomodulation therapy (PBMT) in comparison to placebo on markers of respiratory and muscle activity, blood acid-base, ion and lactate concentrations, indicators of muscle fatigue (global, central, and peripheral), and time to exhaustion in severe-intensity cycling. Methods Two separate studies were performed, both in a pseudorandomized and balanced, crossover design. In study 1, 14 male recreational cyclists completed three constant-load, severe-intensity cycling bouts that were duration matched. The PBMT (18 × 38 cm array with 200 diodes) treatments occurred before bouts at 260, 130, or 0 J (placebo) doses. EMG activity of selected lower limb musculature was assessed during each bout. Maximal voluntary contractions of knee extension with peripheral nerve stimulations and EMG activity evaluation of vastus lateralis was also performed before and after cycling. In study 2, 13 recreational cyclists performed three bouts of constant-load, severe-intensity cycling until exhaustion, preceded by PBMT as detailed previously. Blood lactate concentrations, respiratory responses, EMG activity, and capillary gasometry aspects were monitored. Results In both studies, there were no interactions effects (time-condition) on the EMG activity, which was displayed as root mean square (P ≥ 0.168) and median frequency (P ≥ 0.055) during cycling. In study 1, there were no interaction effects on the indicators of muscle fatigue after exercise (P ≥ 0.130). In study 2, there were no differences on time to exhaustion (P = 0.353) and no interaction effects among the physiological responses monitored (P ≥ 0.082). Conclusions Based on our findings, the PBMT at 260- and 130-J doses does not have a beneficial effect on muscle fatigue, cycling performance, metabolic parameters, and muscle activity in male recreational cyclists.en
dc.description.affiliationLaboratory of Physiology and Sport Performance (LAFIDE) São Paulo State University (UNESP)
dc.description.affiliationExercise Physiology Laboratory Department of Kinesiology University of Alabama
dc.description.affiliationBiomedical Engineering Postgraduate Program Universidade Brasil
dc.description.affiliationUnespLaboratory of Physiology and Sport Performance (LAFIDE) São Paulo State University (UNESP)
dc.format.extent2448-2458
dc.identifierhttp://dx.doi.org/10.1249/MSS.0000000000002394
dc.identifier.citationMedicine and Science in Sports and Exercise, v. 52, n. 11, p. 2448-2458, 2020.
dc.identifier.doi10.1249/MSS.0000000000002394
dc.identifier.issn1530-0315
dc.identifier.issn0195-9131
dc.identifier.scopus2-s2.0-85092093294
dc.identifier.urihttp://hdl.handle.net/11449/205264
dc.language.isoeng
dc.relation.ispartofMedicine and Science in Sports and Exercise
dc.sourceScopus
dc.subjectERGOGENIC AID
dc.subjectLED THERAPY
dc.subjectLOW-LEVEL LASER THERAPY
dc.subjectPHYSICAL PERFORMANCE
dc.subjectTWITCH INTERPOLATION TECHNIQUE
dc.titleAcute Photobiomodulation by LED Does Not Alter Muscle Fatigue and Cycling Performanceen
dc.typeArtigo

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