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Download fileDynamics of the power-duration relationship during prolonged endurance exercise and influence of carbohydrate ingestion
journal contribution
posted on 2019-07-10, 07:42 authored by Ida E. Clark, Anni Vanhatalo, Christopher Thompson, Charlotte Joseph, Matt I. Black, Jamie R. Blackwell, Lee J. Wylie, Rachel Tan, Stephen BaileyStephen Bailey, Brad W. Wilkins, Brett S. Kirby, Andrew M. JonesWe tested the hypotheses that the parameters of the power-duration relationship, estimated as the end-test power (EP) and work done above EP (WEP) during a 3-min all-out exercise test (3MT), would be reduced progressively after 40 min, 80 min, and 2 h of heavy-intensity cycling and that carbohydrate (CHO) ingestion would attenuate the reduction in EP and WEP. Sixteen participants completed a 3MT without prior exercise (control), immediately after 40 min, 80 min, and 2 h of heavy-intensity exercise while consuming a placebo beverage, and also after 2 h of heavy-intensity exercise while consuming a CHO supplement (60 g/h CHO). There was no difference in EP measured without prior exercise (260 ± 37 W) compared with EP after 40 min (268 ± 39 W) or 80 min (260 ± 40 W) of heavy-intensity exercise; however, after 2 h EP was 9% lower compared with control (236 ± 47 W; P < 0.05). There was no difference in WEP measured without prior exercise (17.9 ± 3.3 kJ) compared with after 40 min of heavy-intensity exercise (16.1 ± 3.3 kJ), but WEP was lower (P < 0.05) than control after 80 min (14.7 ± 2.9 kJ) and 2 h (13.8 ± 2.7 kJ). Compared with placebo, CHO ingestion negated the reduction of EP following 2 h of heavy-intensity exercise (254 ± 49 W) but had no effect on WEP (13.5 ± 3.4 kJ). These results reveal a different time course for the deterioration of EP and WEP during prolonged endurance exercise and indicate that EP is sensitive to CHO availability.
History
School
- Sport, Exercise and Health Sciences
Published in
Journal of Applied PhysiologyVolume
127Issue
3Pages
726 - 736Citation
CLARK, I.E. ... et al, 2019. Dynamics of the power-duration relationship during prolonged endurance exercise and influence of carbohydrate ingestion. Journal of Applied Physiology, 127 (3), pp.726-736.Publisher
American Physiological SocietyVersion
- AM (Accepted Manuscript)
Rights holder
© American Physiological SocietyPublisher statement
This paper was accepted for publication in the journal Journal of Applied Physiology and the definitive published version is available at https://doi.org/10.1152/japplphysiol.00207.2019.Acceptance date
2019-07-09Publication date
2019-09-01Copyright date
2019ISSN
8750-7587eISSN
1522-1601Language
- en