Photobiomodulation 30 min or 6 h Prior to Cycling Does Not Alter Resting Blood Flow Velocity, Exercise-Induced Physiological Responses or Time to Exhaustion in Healthy Men

Autor(es)

Dutra, Yago Medeiros ^[1] ; Claus, Gabriel Machado ^[1] ; Malta, Elvis de Souza ^[1] ; Seda, Daniela Moraes de Franco ^[1] ; Zago, Anderson Saranz ^[2] ; Campos, Eduardo Zapaterra ^[3] ; Ferraresi, Cleber ^[4] ; Zagatto, Alessandro Moura ^{[3, 1]}

Afiliação do(s) autor(es)

^[1] Sao Paulo State Univ UNESP, Postgrad Program Movement Sci, Lab Physiol & Sport Performance LAFIDE, Dept Phys Educ, Sch Sci, Bauru, SP - Brazil

^[2] Sao Paulo State Univ UNESP, Postgrad Program Movement Sci, Dept Phys Educ, Sch Sci, Bauru, SP - Brazil

^[3] Univ Fed Pernambuco, Dept Phys Educ, Recife, PE - Brazil

^[4] Fed Univ Sao Carlos UFSCar, Phys Therapy Dept, Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: FRONTIERS IN PHYSIOLOGY; v. 11, JAN 15 2021.
• Citações Web of Science: 0

Resumo

Purpose The aim of the current study was to investigate the effects of photobiomodulation therapy (PBMT) applied 30 min or 6 h prior to cycling on blood flow velocity and plasma nitrite concentrations at rest, time to exhaustion, cardiorespiratory responses, blood acid-base balance, and K+ and lactate concentrations during exercise. Methods In a randomized, crossover design, 13 healthy untrained men randomly completed four cycling bouts until exhaustion at the severe-intensity domain (i.e., above respiratory compensation point). Thirty minutes or 6 h prior to the cycling trials, participants were treated with PBMT on the quadriceps, hamstrings, and gastrocnemius muscles of both limbs using a multi-diode array (11 cm x 30 cm with 264 diodes) at doses of 152 J or a sham irradiation (with device turned off, placebo). Blood samples were collected before and 30 min or 6 h after treatments to measure plasmatic nitrite concentrations. Doppler ultrasound exams of the femoral artery were also performed at the same time points. Cardiorespiratory responses, blood acid-base balance, and K+ and lactate concentrations were monitored during exercise sessions. Results PBMT did not improve the time to exhaustion (p = 0.30). At rest, no differences were found in the peak systolic velocity (p = 0.97) or pulsatility index (p = 0.83) in the femoral artery, and in plasma nitrite concentrations (p = 0.47). During exercise, there were no differences for any cardiorespiratory response monitored (heart rate, p = 0.15; oxygen uptake, p = 0.15; pulmonary ventilation, p = 0.67; carbon dioxide output, p = 0.93; and respiratory exchange ratio, p = 0.32), any blood acid-base balance indicator (pH, p = 0.74; base excess, p = 0.33; bicarbonate concentration, p = 0.54), or K+ (p = 0.22) and lactate (p = 0.55) concentrations. Conclusions PBMT at 152 J applied 30 min or 6 h before cycling at severe-intensity did not alter resting plasma nitrite and blood flow velocity in the femoral artery, exercise-induced physiological responses, or time to exhaustion in healthy untrained men. (AU)

• Processo FAPESP: 17/21724-8 - Impacto do uso regular de imersão em água fria após sessões de treinamento intervalado de alta intensidade sobre o reparo tecidual, adaptação muscular e desempenho em corrida
• Beneficiário: Elvis de Souza Malta
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 17/11255-0 - Avaliação dos efeitos da terapia de fotobiomodulação sobre parâmetros de atividade muscular, tempo até a exaustão em esforço no domínio severo em ciclo ergômetro e nos aspectos centrais e periféricos da fadiga muscular
• Beneficiário: Yago Medeiros Dutra
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 17/14187-6 - Efeito de protocolos específicos de potenciação pós ativação sobre o desempenho em esforços de SPRINT repetidos com mudança de direção e a mensuração da fadiga em atletas de basquete
• Beneficiário: Gabriel Machado Claus
• Modalidade de apoio: Bolsas no Brasil - Mestrado