Fig. 1.

${\dot{V}}_{{\text{O}}_2}$, ${\dot{V}}_{{\text{CO}}_2}$, ${\dot{V}}_{\text{E}}$, HR, RPE, and Load. The data for each intensity are plotted against %${\dot{V}}_{{\text{O}}_{\text{2peak}}}$. on the x-axis and each parameter on the y-axis. The plots from left to right show rest, very-light, light, moderate, vigorous, and near maximal/maximal intervals. ${\dot{V}}_{{\text{O}}_2}$, oxygen intake; ${\dot{V}}_{{\text{CO}}_2}$, carbon dioxide output; ${\dot{V}}_{\text{E}}$, minute ventilation; HR, heart rate; RPE, ratings of perceived exertion. Data are presented as mean. The gray bands represent 95% CI, although some are too small to clearly visualize. The horizontal error bars (95% CI) cannot be visualized as all were smaller than 1.0% ${\dot{V}}_{{\text{O}}_{\text{2peak}}}$