Abstract
Aim: The present study investigated the effects of hyperthermia on intermittent exercise and repeated sprint performance.
Methods: Seven men completed 40 min of intermittent cycling comprising of 15 s exercise (306 ± 22 W) and 15 s rest periods (0 W) followed by 5 × 15 s maximal sprints on a cycle ergometer in normal (∼20 °C, control) and hot (40 °C, hyperthermia) environments.
Results: Completion of the intermittent protocol in the heat elevated core and muscle temperatures (39.5 ± 0.2 °C; 40.2 ± 0.4 °C), heart rate (178 ± 11 beats min−1), rating of perceived exertion (RPE) (18 ± 1) and noradrenaline (38.9 ± 13.2 μmol l−1) (all P
Conclusion: Although an elevated muscle temperature is expected to promote sprint performance, power output during the repeated sprints was reduced by hyperthermia. The impaired performance does not seem to relate to the accumulation of recognized metabolic fatigue agents and we, therefore, suggest that it may relate to the influence of high core temperature on the function of the central nervous system.
Methods: Seven men completed 40 min of intermittent cycling comprising of 15 s exercise (306 ± 22 W) and 15 s rest periods (0 W) followed by 5 × 15 s maximal sprints on a cycle ergometer in normal (∼20 °C, control) and hot (40 °C, hyperthermia) environments.
Results: Completion of the intermittent protocol in the heat elevated core and muscle temperatures (39.5 ± 0.2 °C; 40.2 ± 0.4 °C), heart rate (178 ± 11 beats min−1), rating of perceived exertion (RPE) (18 ± 1) and noradrenaline (38.9 ± 13.2 μmol l−1) (all P
Conclusion: Although an elevated muscle temperature is expected to promote sprint performance, power output during the repeated sprints was reduced by hyperthermia. The impaired performance does not seem to relate to the accumulation of recognized metabolic fatigue agents and we, therefore, suggest that it may relate to the influence of high core temperature on the function of the central nervous system.
| Original language | English |
|---|---|
| Pages (from-to) | 181-190 |
| Number of pages | 10 |
| Journal | Acta Physiologica |
| Volume | 183 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 2005 |
Keywords
- fatigue
- hyperthermia
- muscle metabolites
- sprint performance