Table 2.

Physiological and perceptual responses at the symptom-limited peak incremental cycle exercise (n=40)

Parameter	Mean (SD)
Power output (W)	76 (29)
Power output (% predicted)	55.8 (18.3)
$\dot{V}{\mathrm{O}}_2(\text{mL}·{\text{kg}}^{-1}·{\min }^{-1})$	18.4 (4.7)
$\dot{V}{\mathrm{O}}_2\left(\%\text{predicted}\right)$	82.4 (17.9)
$\dot{V}{\text{CO}}_2(\text{mL}\cdot {\text{kg}}^{–1}\cdot {\min }^{-1})$	18.9 (6.0)
${\dot{V}}_{\mathrm{E}}/\dot{V}{\text{CO}}_2$	36.8 (6.6)
HR (beats·min–1)	121 (21)
HR (% predicted)	72.8 (12.0)
SpO2 (%)	94.1 (2.7)
${\dot{V}}_{\mathrm{E}}(\mathrm{L}\cdot {\min }^{-1})$	48.9 (14.1)
${\dot{V}}_{\mathrm{E}}(\%\text{MVV})$	99 (17)
VT (L)	1.39 (0.27)
f (breaths·min−1)	35.8 (6.34)
IC (L)	1.89 (0.48)
Δ IC rest–peak exercise (L)	−0.70 (0.36)
IRV (L)	0.48 (0.29)
Dyspnea (Borg 0–10 scale units)	6.2 (2.0)
Leg discomfort (Borg 0–10 scale units)	6.3 (2.1)

Abbreviations: f, breathing frequency; Δ, change from rest to end exercise; SpO₂, oxygen pulse saturation; $\dot{V}{\text{CO}}_2$, CO₂ production; ${\dot{V}}_{\mathrm{E}}$, ventilation; ${\dot{V}}_{\mathrm{E}}/\dot{V}{\text{CO}}_2$, ventilatory equivalent for CO₂; $\dot{V}{\mathrm{O}}_2$, O₂ uptake; V_T, tidal volume. HR, heart rate; IC, inspiratory capacity; IRV, inspiratory reserve volume; MVV, maximum voluntary ventilation.