Acute effects of low-level laser therapy on physiologic and electromyographic responses to the cardiopulmonary exercise testing in healthy untrained adults

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dc.contributor.author Silva Alves, Mariana Agnes da [UNIFESP]
dc.contributor.author Pinfildi, Carlos Eduardo [UNIFESP]
dc.contributor.author Neto, Luiz Nilsen [UNIFESP]
dc.contributor.author Lourenco, Rebeca Palomo [UNIFESP]
dc.contributor.author Silva Marques de Azevedo, Paulo Henrique [UNIFESP]
dc.contributor.author Dourado, Victor Zuniga [UNIFESP]
dc.date.accessioned 2016-01-24T14:38:04Z
dc.date.available 2016-01-24T14:38:04Z
dc.date.issued 2014-11-01
dc.identifier http://dx.doi.org/10.1007/s10103-014-1595-3
dc.identifier.citation Lasers in Medical Science. London: Springer London Ltd, v. 29, n. 6, p. 1945-1951, 2014.
dc.identifier.issn 0268-8921
dc.identifier.uri http://repositorio.unifesp.br/handle/11600/38378
dc.description.abstract Despite the positive effects of low-level laser therapy (LLLT) on muscle fatigue before exercises using a single muscle group, the acute effects of LLLT on performance in cardiopulmonary exercise testing (CPET) are poorly understood. We aimed to assess the acute effects of LLLT on physiologic and electromyographic responses to the CPET in healthy adults. A randomized, double-blind, placebo-controlled crossover trial was performed with 18 untrained participants (nine males, 22 +/- 2 years). We applied LLLT or placebo on quadriceps and gastrocnemius 10 min before two rapidly incremental CPETs randomly performed in alternate days on a cycle ergometer. Participants received LLLT using a multidiode cluster, 20 s/site (850 nm, 100 mW/diode, 14 J/site). Physiological responses to the CPET were continuously monitored using a gas analyzer. the electromyographic fatigue threshold (EMGth) was assessed through surface electrodes on vastus lateralis. the root mean square (RMS) was plotted every 5 s against the exercise intensity, and its breakpoint values throughout the CPET was identified as EMGth. Compared to placebo, the LLLT significantly increased peak O-2 uptake (V'O-2 33 +/- 10 vs. 31 +/- 9 mL/min/kg). We observed a shallower slope of the Delta heart rate/Delta V'O-2 during the CPET after LLLT compared to placebo, i.e., increased cardiovascular efficiency (56 +/- 24 vs. 66 +/- 30 bpm/L/min). There were no LLLT-related changes in EMGth. the LLLT acutely increases exercise performance in healthy untrained adults probably due to increased O-2 extraction by peripheral muscles without causing a significant impact on muscle fatigue. en
dc.format.extent 1945-1951
dc.language.iso eng
dc.publisher Springer
dc.relation.ispartof Lasers in Medical Science
dc.rights Acesso restrito
dc.subject Laser en
dc.subject Exercise en
dc.subject Oxygen uptake en
dc.title Acute effects of low-level laser therapy on physiologic and electromyographic responses to the cardiopulmonary exercise testing in healthy untrained adults en
dc.type Artigo
dc.rights.license http://www.springer.com/open+access/authors+rights?SGWID=0-176704-12-683201-0
dc.contributor.institution Universidade Federal de São Paulo (UNIFESP)
dc.description.affiliation Universidade Federal de São Paulo, Dept Human Movement Sci, BR-11015020 São Paulo, Brazil
dc.description.affiliationUnifesp Universidade Federal de São Paulo, Dept Human Movement Sci, BR-11015020 São Paulo, Brazil
dc.identifier.doi 10.1007/s10103-014-1595-3
dc.description.source Web of Science
dc.identifier.wos WOS:000344539700023



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