Muscle metabolic determinants of exercise tolerance following exhaustion: relationship to the "critical power".
Publication/Presentation Date
7-15-2013
Abstract
We tested the hypothesis that muscle high-energy phosphate compounds and metabolites related to the fatigue process would be recovered after exhaustion during recovery exercise performed below but not above critical power (CP) and that these changes would influence the capacity to continue exercise. Eight male subjects completed single-leg, knee-extension exercise to exhaustion (for ∼180 s) on three occasions, followed by a work-rate reduction to severe-intensity exercise, heavy-intensity exercise (CP conditions (at least 10 min and 39 ± 31 s, respectively; P < 0.05). During passive recovery and CP recovery exercise, neither muscle [PCr] nor pH recovered, reaching ∼37% of the initial baseline and 6.6 ± 0.2, respectively. These results indicate that the muscle metabolic dynamics in recovery from exhaustive >CP differ according to whether the recovery exercise is performed below or above the CP. These findings confirm the importance of the CP as an intramuscular metabolic threshold that dictates the accumulation of fatigue-related metabolites and the capacity to tolerate high-intensity exercise.
Volume
115
Issue
2
First Page
243
Last Page
250
ISSN
1522-1601
Published In/Presented At
Chidnok, W., Fulford, J., Bailey, S. J., Dimenna, F. J., Skiba, P. F., Vanhatalo, A., & Jones, A. M. (2013). Muscle metabolic determinants of exercise tolerance following exhaustion: relationship to the "critical power". Journal of applied physiology (Bethesda, Md. : 1985), 115(2), 243–250. https://doi.org/10.1152/japplphysiol.00334.2013
Disciplines
Business Administration, Management, and Operations | Health and Medical Administration | Management Sciences and Quantitative Methods
PubMedID
23640601
Department(s)
Administration and Leadership
Document Type
Article