From: Loading and unloading breathing during exercise: respiratory responses and compensatory mechanisms
Parameters | Room Air | He-O 2 | Room air | Ar-O 2 | Room air | SF 6 -O 2 |
---|---|---|---|---|---|---|
VE, l/min | 8.89 ± 0.51 | 9.28 ± 0.56 | 9.06 ± 0.50 | 9.07 ± 0.54 | 9.01 ± 0.69 | 8.95 ± 0.55 |
VT, l | 0.86 ± 0.18 | 0.92 ± 0.19 | 0.79 ± 0.11 | 0.85 ± 0.14 | 0.86 ± 0.17 | 0.94 ± 0.15* |
TI, s | 2.46 ± 0.62 | 2.42 ± 0.56 | 2.11 ± 0.38 | 2.36 ± 0.48 | 2.51 ± 0.58 | 2.94 ± 0.70 |
TE, s | 3.43 ± 0.58 | 3.52 ± 0.69 | 3.38 ± 0.44 | 3.44 ± 0.51 | 3.53 ± 0.55 | 3.59 ± 0.51 |
TT, s | 5.59 ± 0.78 | 5.95 ± 1.15 | 5.49 ± 0.78 | 5.80 ± 0.99 | 6.04 ± 1.14 | 6.53 ± 1.15* |
f, cycle/min | 12.7 ± 1.4 | 12.5 ± 1.4 | 13.2 ± 1.7 | 12.7 ± 1.5 | 12.3 ± 1.5 | 11.3 ± 1.7* |
PACO2, mmHg | 33.9 ± 1.1 | 33.5 ± 1.2 | 33.9 ± 1.1 | 34.9 ± 1.2 | 33.3 ± 0.7 | 33.4 ± 1.0 |
VImax, l/s | 0.42 ± 0.02 | 0.57 ± 0.04* | 0.48 ± 0.04 | 0.50 ± 0.03 | 0.44 ± 0.02 | 0.34 ± 0.02* |
PIm, cmH2O | 0.70 ± 0.05 | 0.46 ± 0.07* | 0.76 ± 0.06 | 0.80 ± 0.12 | 0.74 ± 0.05 | 1.05 ± 0.03** |
WI, kgm/min | 0.06 ± 0.01 | 0.04 ± 0.07 | 0.07 ± 0.01 | 0.07 ± 0.01 | 0.07 ± 0.01 | 0.01 ± 0.01** |
dP/dtI, mmH2O/s | 32.40 ± 3.17 | 23.35 ± 2.71* | 31.30 ± 3.69 | 37.50 ± 4.64 | 32.70 ± 3.38 | 57.80 ± 8.19** |