English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

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 × 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.

frontiers in physiology

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