Table 4: Changes in Expired ventilation (
) and Heart rate (fH) at rest and during incremental exercise at the three CO2 levels.
|
Air (n=8) |
3% CO2 (n=8) |
6% CO2 (n=8) |
(l/min) |
Rest |
8.8 ± 1.1 |
14.9 ± 0.8* |
26.5 ± 4.3*† |
|
30%
|
19.1 ± 3.0 |
29.9 ± 6.0* |
45.8 ± 11.5*† |
|
45% |
30.6 ± 7.4 |
41.1 ± 10.0* |
62.7 ± 13.2*† |
|
60% |
41.7 ± 6.7 |
58.0 ± 10.0* |
75.9 ± 15.6*† |
|
80% |
68.6 ± 14.7 |
87.8 ± 13.1* |
94.1 ± 21.1*† |
|
90% |
85.7 ± 14.7 |
104.3 ± 17.4* |
108.3 ± 22.8*† |
|
Max |
109.9 ± 22.3 |
125.5 ± 22.3* |
118.8 ± 23.7 |
fH(beats/min) |
Rest |
71.9 ± 9.2 |
75.6 ± 7.7 |
82.0 ± 10.9* |
|
30% |
98.0 ± 9.4 |
97.1 ± 7.5 |
103.4 ± 6.2 |
|
45% |
113.9 ± 6.7 |
112.5 ± 6.8 |
123.1 ± 6.9*† |
|
60% |
133.6 ± 13.6 |
134.6 ± 12.2 |
142.0 ± 12.1 |
|
80% |
166.0 ± 9.6 |
165.1 ± 8.9 |
163.1 ± 11.1 |
|
90% |
176.9 ± 7.5 |
175.4 ± 8.2 |
172.1 ± 9.4 |
|
Max |
185.3 ± 8.5 |
182.8 ± 7.8 |
177.1 ± 7.0 |
Values are means ± SD. *P<0.05 vs Air. †P<0.05 vs 3% CO2 .