Table 1. VO2 response parameters in upright and supine cycling at the same relative intensity. Mean values are (± SD) (n = 9).

 

Upright

Supine

VO2 (b) (L·min-1)

.80 (.13)

.68 (.08) *

Ap (L·min-1)

1.91 (.49)

1.53 (.33) *

tp (s)

23.5 (6.7)

32.7 (10.7) *

As (L·min-1)

.44 (.20)

.22 (.13) *

ts (s)

126.3 (60.7)

142.5 (101.8)

As (%)

19.1 (7.4)

13.2 (8.1)

VO2 (b) is the average value of VO2 during the 3-min warm-up, AP and AS are the asymptotic amplitudes and p and s are the time constants of the primary and slow component phases, respectively. * Significantly different from upright cycling (p < 0.05).