Photobiomodulation 30 min or 6 h Prior to Cycling ... - BV FAPESP
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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
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]
Total Authors: 8
Affiliation:
[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
Total Affiliations: 4
Document type: Journal article
Source: FRONTIERS IN PHYSIOLOGY; v. 11, JAN 15 2021.
Web of Science Citations: 0
Abstract

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)

FAPESP's process: 17/21724-8 - Impact of cold-water immersion regular use after high-intensity interval training sessions on muscle repair, muscle adaptation and running performance
Grantee:Elvis de Souza Malta
Support Opportunities: Scholarships in Brazil - Doctorate
FAPESP's process: 17/11255-0 - Evaluation of the effects of photobiomodulation therapy on parameters of muscle activity, time to exhaustion in constant-load severe-intensity cycling and on the peripheral and central aspects of muscle fatigue
Grantee:Yago Medeiros Dutra
Support Opportunities: Scholarships in Brazil - Master
FAPESP's process: 17/14187-6 - Effect of specific post-activation potentiation protocols on performance in repeated sprint efforts with change of direction and fatigue measurement in basketball athletes
Grantee:Gabriel Machado Claus
Support Opportunities: Scholarships in Brazil - Master