Acute Effects Using Light-Emitting Diode Therapy (LEDT) for Muscle Function during Isometric Exercise in Asthma Patients: A Pilot Study.

Ivan Peres Costa,Paulo De Tarso De Carvalho,Roberto Stirbulov,Kátia De Angelis,Etiene Farah Teixeira De Carvalho,Nivaldo Antonio Parizotto,Manoel Carneiro Oliveira-Junior,Ross Arena,Dirceu Costa,Lucianamaria Malosá Sampaio,João Carlos Ferrari Corrêa,Lawrence P Cahalin,Simone Dal Corso,Rodolfo P Vieira,Fabiano Politti

doi:10.1155/2019/7501870

Abstract

The aim of this study was to evaluate the effectiveness of acute application of LEDT in improving peripheral muscle performance during isometric exercise in patients with asthma. Eleven patients, with a mean age 38 ± 10, underwent a single LEDT and sham application in the femoral quadriceps' dominant member (cluster with 50 LED λ = 850 nm, 50 mW, 15 s; 37.5 J), 48 h apart in a randomized crossover design. Before and after LEDT and sham application, the patients were submitted an isometric endurance test (60% of the maximum isometric voluntary contraction), up to the limit of tolerance simultaneous recording of surface electromyography. There were no statistically significant differences between groups at the time of contraction (before 41±14 versus 44±16; after 46±12 versus 45±20 s) during the isometric contraction test and inflammatory markers before and after a single LEDT application. A single application of LEDT in the parameters and dose according to the equipment used in the study were not able to promote differences in the time of contraction and the fatigue response in asthmatic patients. However, the chronic effects of LEDT application for improving muscle performance in these patients are unknown and may present different responses during applications for a long time.

Highlights

Researchers reported acute respiratory myopathies caused by the use of high dosages of systemic steroids [1], but the chronic muscle consequences of prolonged use in asthma remain controversial
The results presented that the local light-emitting diode therapy (LEDT) irradiation of the quadriceps muscle could delay the development of peripheral fatigue during isometric and dynamic exercise and the photobiomodulation with combination of super-pulsed laser and light-emitting diodes is beneficial in improvement of muscular performance, dyspnea, and fatigue sensation in those patients with chronic obstructive pulmonary disease (COPD). [6]
Electrophysical agents such as low level laser therapy (LLLT) and light-emitting diode therapy (LEDT) have been commonly used to treat muscle fatigue and injuries and to promote a better muscle performance when applied to muscles immediately before or after high intensity exercise

Summary

Introduction

Researchers reported acute respiratory myopathies caused by the use of high dosages of systemic steroids [1], but the chronic muscle consequences of prolonged use in asthma remain controversial. Miranda et al [2014] used a single LEDT application and a combination of super-pulsed laser and light-emitting diodes in patients with chronic obstructive pulmonary disease (COPD) during a maximum isometric exercise protocol, submaximal, and dynamic exercise. The results presented that the local LEDT irradiation of the quadriceps muscle could delay the development of peripheral fatigue during isometric and dynamic exercise and the photobiomodulation with combination of super-pulsed laser and light-emitting diodes is beneficial in improvement of muscular performance, dyspnea, and fatigue sensation in those patients with COPD. The therapeutic effects presented by this type of laser are (I) analgesic and anti-inflammatory [11], (II) nerve regeneration [12], (III) wound healing [13], and (IV) recovery of muscle fatigue [8]

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