Table 2. Metabolic responses and substrate oxidation during 40 km time-trial. Data are mean (±SE). |
|
|
10 km |
20 km |
30 km |
40 km |
| HR (bpm) |
PLA |
158(2) |
160(3) |
163(4) |
170(3)* |
|
CHO |
157(2) |
160(3) |
160(2) |
173(3)* |
| V̇O2 (l·min-1) |
PLA |
3.9 (.1) |
3.9 (.1) |
4.0 (.1) |
4.2 (.1) |
|
CHO |
3.9 (.1) |
3.9 (.1) |
4.0 (.2) |
4.4 (.2) |
| V̇E (l·min-1) |
PLA |
89.6 (4.1) |
89.6 (4.4) |
92.8 (3.7) |
104.2 (2.3)† |
|
CHO |
93.9 (4.1) |
93.9 (4.1) |
94.9 (5.2) |
113.8 (5.6)* |
| RER |
PLA |
.90 (.01) |
.87 (.01)‡ |
.87 (.01) |
.89 (.01) |
|
CHO |
.92 (.02) |
.90 (.01)‡ |
.89 (.02)§ |
.92 (.02) |
| Carb. oxidation (g·min-1) |
PLA |
3.27 (.23) |
2.77 (.20)‡ |
2.75 (.20) |
3.33 (.29) |
|
CHO |
3.68 (.27) |
3.28 (.23) |
3.15 (.33)¶ |
4.06 (.43) |
| Fat oxidation (g·min-1) |
PLA |
.64 (.09) |
.82 (.05) |
.86 (.05) |
.76 (.08) |
|
CHO |
.47 (.12) |
.64 (.09) |
.73(10) |
.57 (.12) |
|
No differences (p > 0.05) were observed between conditions for overall mean values. |
* Significantly different from 10 km, 20 km, and 30 km values |
† Significantly different from 20 km and 30 km values |
‡ Significantly different from 10 km value |
§ Significantly different from 10 km, 20 km, and 40 km values |
¶ Significantly different from 40 km value |
|