Table 3.
Muscle metabolite concentrations at rest and during 10 min exercise at 68% V̇O2,peak with (CHO) or without (CON) prior carbohydrate ingestion
| Measure | Condition | Pre-ingestion | 0 min | 1 min | 10 min |
|---|---|---|---|---|---|
| ATP | CON | — | 26.8 ± 1.1 | 26.1 ± 1.1 | 25.8 ± 0.8 |
| CHO | 25.9 ± 0.9 | 26.7 ± 1.0 | 25.8 ± 1.0 | 26.8 ± 1.3 | |
| PCr | CON | — | 89.3 ± 4.2 | 58.0 ± 4.8§ | 43.6 ± 9.1§ |
| CHO | 87.7 ± 4.3 | 88.5 ± 3.6 | 61.2 ± 4.7§ | 39.4 ± 4.9§ | |
| Creatine | CON | — | 49.1 ± 2.1 | 78.7 ± 5.0§ | 99.0 ± 6.2§ |
| CHO | 48.7 ± 2.3 | 47.8 ± 3.1 | 75.3 ± 6.8§ | 97.9 ± 5.6§ | |
| Lactate | CON | — | 5.2 ± 0.7 | 23.5 ± 3.2§ | 37.7 ± 5.7§ |
| CHO | 8.2 ± 1.7 | 5.3 ± 0.7 | 23.9 ± 3.1§ | 47.0 ± 8.3§ | |
| Pyruvate | CON | — | 0.11 ± 0.01 | 0.21 ± 0.02§ | 0.22 ± 0.01§ |
| CHO | 0.12 ± 0.01 | 0.08 ± 0.01† | 0.19 ± 0.02§ | 0.19 ± 0.01§ | |
| G-6-P | CON | — | 0.92 ± 0.12 | 3.22 ± 0.68§ | 2.04 ± 0.27§ |
| CHO | 0.99 ± 0.18 | 1.40 ± 0.34 | 2.32 ± 0.50* | 2.45 ± 0.31 | |
| Free ADP | CON | — | 97.8 ± 6.3 | 207.1 ± 25.3§ | 370.9 ± 68.7§ |
| CHO | — | 95.4 ± 6.7 | 185.9 ± 26.3§ | 319.0 ± 36.4§ | |
| Free AMP | CON | — | 0.35 ± 0.05 | 1.69 ± 0.36§ | 6.62 ± 2.29§ |
| CHO | — | 0.34 ± 0.05 | 1.43 ± 0.35§ | 4.13 ± 0.92§ | |
| Free P1 | CON | — | — | 38.8 ± 4.4 | 56.3 ± 10.4 |
| CHO | — | — | 37.9 ± 4.4 | 61.1 ± 4.2 |
Data are means ± s.e.m., n = 8. All value are expressed as mmol (kg d.m.)−1 except free ADP and free AMP which are expressed as μmol (kg d.m.)−1.
†
Significantly different from pre-ingestion
*
significantly different from corresponding time point for CON
§
significantly different from 0 min of same condition (P <0.05).