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An examination of neuromuscular and metabolic fatigue thresholds.
- Source :
- Physiological Measurement; Oct2013, Vol. 34 Issue 10, p1253-1267, 15p
- Publication Year :
- 2013
-
Abstract
- This study examined the relationships among the physical working capacity at the fatigue threshold (PWC<subscript>FT</subscript>), 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 PWC<subscript>FT</subscript>, PGET, and PRCP. CP was determined from the 3 min all-out test. The PWC<subscript>FT</subscript> (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 PWC<subscript>FT</subscript>, PRCP, and CP. All thresholds were significantly inter-4 (r = 0.794–0.958). The 17% greater estimates for the PWC<subscript>FT</subscript> 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 PWC<subscript>FT</subscript> and the PRCP suggested that hyperkalemia may underlie both thresholds. Furthermore, it is possible that the 5% lower estimate of the PWC<subscript>FT</subscript> than CP could more accurately reflect the demarcation of the heavy from severe exercise intensity domains. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09673334
- Volume :
- 34
- Issue :
- 10
- Database :
- Complementary Index
- Journal :
- Physiological Measurement
- Publication Type :
- Academic Journal
- Accession number :
- 94295727
- Full Text :
- https://doi.org/10.1088/0967-3334/34/10/1253