Journal article
An examination of neuromuscular and metabolic fatigue thresholds
Physiological measurement, Vol.34(10), pp.1253-1267
10/01/2013
DOI: 10.1088/0967-3334/34/10/1253
PMID: 24021781
Abstract
This study examined the relationships among the physical working capacity at the fatigue threshold (PWCFT), the power outputs associated with the gas exchange threshold (PGET) and the respiratory compensation point (PRCP), and critical power (CP) to identify possible physiological mechanisms underlying the onset of neuromuscular fatigue. Ten participants (mean +/- SD age: 20 +/- 1 years) performed a maximal incremental cycle ergometer test to determine the PWCFT, PGET, and PRCP. CP was determined from the 3 min all-out test. The PWCFT (197 +/- 55 W), PRCP (212 +/- 50 W), and CP (208 +/- 63 W) were significantly greater than the PGET (168 +/- 40 W), but there were no significant differences among the PWCFT, PRCP, and CP. All thresholds were significantly inter-4 (r = 0.794-0.958). The 17% greater estimates for the PWCFT than PGET were likely related to differences in the physiological mechanisms that underlie these fatigue thresholds, while the non-significant difference and high correlation between the PWCFT and the PRCP suggested that hyperkalemia may underlie both thresholds. Furthermore, it is possible that the 5% lower estimate of the PWCFT than CP could more accurately reflect the demarcation of the heavy from severe exercise intensity domains.
Details
- Title: Subtitle
- An examination of neuromuscular and metabolic fatigue thresholds
- Creators
- Haley C. Bergstrom - University of Nebraska–LincolnTerry J. Housh - University of Nebraska–LincolnKristen C. Cochrane - University of Nebraska–LincolnNathaniel D. M. Jenkins - University of Nebraska–LincolnRobert W. Lewis - University of Nebraska–LincolnDaniel A. Traylor - University of Nebraska–LincolnJorge M. Zuniga - Creighton UniversityRichard J. Schmidt - University of Nebraska–LincolnGlen O. Johnson - University of Nebraska–LincolnJoel T. Cramer - University of Nebraska–Lincoln
- Resource Type
- Journal article
- Publication Details
- Physiological measurement, Vol.34(10), pp.1253-1267
- DOI
- 10.1088/0967-3334/34/10/1253
- PMID
- 24021781
- NLM abbreviation
- Physiol Meas
- ISSN
- 0967-3334
- eISSN
- 1361-6579
- Publisher
- Iop Publishing Ltd
- Number of pages
- 15
- Language
- English
- Date published
- 10/01/2013
- Academic Unit
- Center for Social Science Innovation; Injury Prevention Research Center; Health, Sport, and Human Physiology
- Record Identifier
- 9984259402802771
Metrics
13 Record Views