|
Respiratory and metabolic values during submaximal and maximal exercise |
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| % of VO2max |
30 |
45 |
63 |
Peak VO2 |
|
|
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| VE (L·min-1) |
||||
| PLA |
28.0 ± 2.3 |
41.5 ± 2.4 |
56.6 ± 3.4 |
129.0 ± 15.8 |
| 1.5 |
28.6 ± 3.0 |
42.7 ± 3.8 |
59.3 ± 5.3 |
129.1 ± 13.4 |
| 3.0 |
28.5 ± 2.4 |
42.0 ± 3.2 |
59.5 ± 6.0 |
127.1 ± 12.3 |
| Bf (breaths·min-1) |
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| PLA |
19.3 ± 2.8 |
21.3 ± 2.8 |
23.5 ± 4.1 |
41.0 ± 8.3 |
| 1.5 |
18.7 ± 3.1 |
20.8 ± 3.2 |
23.2 ± 4.4 |
38.8 ± 6.0 |
| 3.0 |
18.0 ± 2.6 |
20.0 ± 3.3* |
23.3 ± 4.1 |
38.9 ± 6.7 |
| VT (L·breath-1) |
||||
| PLA |
1.55 ± 0.23 |
2.02 ± 0.27 |
2.50 ± 0.41 |
3.21 ± 0.36 |
| 1.5 |
1.63 ± 0.27 |
2.13 ± 0.28 |
2.64 ± 0.36 |
3.38 ± 0.31 |
| 3.0 |
1.67 ± 0.19 |
2.22 ± 0.42 |
2.63 ± 0.41 |
3.32 ± 0.36 |
| VO2(ml·kg-1·min-1) |
||||
| PLA |
14.9 ± 1.6 |
22.6 ± 2.4 |
31.0 ± 3.3 |
49.7 ± 4.4 |
| 1.5 |
14.8 ± 0.9 |
22.7 ± 1.7 |
31.4 ± 2.7 |
50.7 ± 5.6 |
| 3.0 |
15.2 ± 1.0 |
23.0 ± 2.1 |
31.9 ± 3.2 |
50.3 ± 4.1 |
| RER |
||||
| PLA |
0.85 ± 0.04 |
0.90 ± 0.02 |
0.94 ± 0.03 |
1.21 ± 0.05 |
| 1.5 |
0.86 ± 0.05 |
0.92 ± 0.03 |
0.96 ± 0.04 |
1.18 ± 0.06 |
| 3.0 |
0.82 ± 0.06 |
0.88 ± 0.05*† |
0.93 ± 0.03† |
1.16 ± 0.06*† |
| RPE |
||||
| PLA |
8.4 ± 1.3 |
11.7 ± 1.5 |
13.8 ± 0.9 |
19.0 ± 0.6 |
| 1.5 |
8.2 ± 1.3 |
11.0 ± 0.7 |
13.4 ± 1.0 |
19.1 ± 0.6 |
| 3.0 |
7.9 ± 1.1 |
11.3 ± 1.2 |
13.4 ± 1.0 |
19.3 ± 0.6 |
|
Values listed as mean ± SD. VE, ventilation; Bf, breathing frequency; VT, tidal volume; VO2, oxygen consumption; RER, respiratory exchange ratio; RPE, rating of perceived exertion. PLA, placebo; 1.5 and 3.0 represent dose of caffeine in mg·kg body weight-1. * Significantly different from placebo (p < 0.05). † Significantly different from 1.5 caffeine in mg·kg body weight-1. (p < 0.05). | ||||
McClaran and Wetter Journal of the International Society of Sports Nutrition 2007 4:11 doi:10.1186/1550-2783-4-11 |
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