FIGURE 4.

Cardiorespiratory responses measured during severe-intensity cycling until exhaustion. a = main time effect, significant difference from rest; b = main time effect, significant difference from 20% time-window; c = main time effect, significant difference from 40% time-window; d = main time effect, significant difference from 60% time-window; e = main time effect, significant difference from 80% time-window; f = main time effect, significant difference from 100% time-window; Ext, exhaustion; $\stackrel{.}{\text{V}}{\text{O}}_2$, oxygen uptake; HR, heart rate; ${\stackrel{.}{\text{V}}}_{\text{E}}$, pulmonary ventilation; $\stackrel{.}{\text{V}}{\text{CO}}_2$, carbon dioxide output; RER, respiratory exhange ratio; PBMT_{30 min}, photobiomodulation applied 30 min before exercise; PLA_{30 min}, placebo treatment applied 30 min before exercise; PBMT_{6 h}, photobiomodulation applied 6 h before exercise; PLA_{6 h}, placebo treatment applied 6 h before exercise. n = 13. Error bars not included for clarity.