Fig. 5.

Whole body metabolic and perception of effort responses to sustained moderate-intensity exercise. Oxygen uptake (V̇o₂), ventilation, respiratory exchange ratio, and rating of perceived exertion in response to 60 min of sustained moderate-intensity exercise with either placebo (open symbols) or histamine receptor antagonism (blockade, solid symbols). *P < 0.05, exercise vs. resting at specified power output. Solitary regression lines for a variable indicate the absence of differences between placebo and blockade. n = 16.