Fig. 3.

Δ%${\dot{V}}_{{\text{O}}_{\text{2peak}}}$-adjusted Δ pupil diameter, Δ ${\dot{V}}_{\text{E}},$ and Δ HR for each intensity interval. R, rest; VL, very-light; L, light; M, moderate; V, vigorous; NM, near maximal/maximal; ${\dot{V}}_{{\text{O}}_{\text{2peak}}}$, peak oxygen uptake; HR, heart rate; ${\dot{V}}_E$, minute ventilation; ^aP < 0.05 greater than R-VL; ^bP < 0.05 greater than VL-L; ^cP < 0.05 greater than L-M; ^dP < 0.05 greater than M-V. Data are presented as mean ± SE