Acute effects of low-level laser therapy on physiologic and electromyographic responses to the cardiopulmonary exercise testing in healthy untrained adults
da Silva Alves MA, Pinfildi CE, Neto LN, Lourenço RP, de Azevedo PH, Dourado VZ
Lasers in medical science · 33 citas
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Cómo se estudió
- Diseño
- Ensayo controlado aleatorizado (indexado por PubMed)
- Estudiado en
- Personas
- Resultado principal
- Marcadores de salud y funcionamiento
Quién lo pagó
- Financiación
- Financiación no declarada
Publicación
- Publicado
- 2014-06-12 · Lasers Med Sci · vol. 29 · número 6 · págs. 1945–1951
- Editorial
- Springer Science+Business Media
- Citado
- 47 citas · más que el 88% de estudios similares · 2.6× el promedio de su campo
- Referencias
- 30 trabajos
- Acceso
- De pago
- Áreas de investigación
- Laser Applications in Dentistry and Medicine · Cardiovascular and exercise physiology · Sports Performance and Training
- Palabras clave
- low-level laser therapy, cardiopulmonary exercise testing, exercise performance, oxygen consumption, cardiovascular efficiency, muscle fatigue, untrained individuals, quadriceps, gastrocnemius, 850 nm laser
- MeSH
- muscle, skeletal, cardiovascular system, humans, exercise test, electromyography, exercise, cross-over studies, double-blind method, muscle fatigue, adolescent, adult, female, male, quadriceps muscle, young adult, healthy volunteers, low-level light therapy
6 autores
- Mariana Agnes da Silva Alves🇧🇷Universidade Federal de São Paulo
- Carlos Eduardo Pinfildi🇧🇷Universidade Federal de São Paulo
- Luiz Nilsen Neto🇧🇷Universidade Federal de São Paulo
- Rebeca Palomo Lourenço🇧🇷Universidade Federal de São Paulo
- Paulo Henrique Silva Marques de Azevedo🇧🇷Universidade Federal de São Paulo
- Victor Zuniga Dourado🇧🇷 · autor de correspondenciaUniversidade Federal de São Paulo
Resumen
El texto original del estudio, en el idioma en que se publicó.
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 O2 uptake (V'O2 33 ± 10 vs. 31 ± 9 mL/min/kg). We observed a shallower slope of the Δheart rate/ΔV'O2 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 O2 extraction by peripheral muscles without causing a significant impact on muscle fatigue.
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