An examination of neuromuscular and metabolic fatigue thresholds

Haley C. Bergstrom, Terry J. Housh, Kristen C. Cochrane, Nathaniel D.M. Jenkins, Robert W. Lewis, Daniel A. Traylor, Jorge M Zuniga, Richard J. Schmidt, Glen O. Johnson, Joel T Cramer

Research output: Contribution to journalArticle

8 Citations (Scopus)

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.

Original languageEnglish (US)
Pages (from-to)1253-1267
Number of pages15
JournalPhysiological Measurement
Volume34
Issue number10
DOIs
StatePublished - Oct 1 2013

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Fatigue
Fatigue of materials
Exercise equipment
Hyperkalemia
Gases
Compensation and Redress

Keywords

  • critical power
  • cycle ergometry
  • gas exchange threshold
  • physical working capacity at the fatigue threshold
  • respiratory compensation point

ASJC Scopus subject areas

  • Biophysics
  • Physiology
  • Biomedical Engineering
  • Physiology (medical)

Cite this

Bergstrom, H. C., Housh, T. J., Cochrane, K. C., Jenkins, N. D. M., Lewis, R. W., Traylor, D. A., ... Cramer, J. T. (2013). An examination of neuromuscular and metabolic fatigue thresholds. Physiological Measurement, 34(10), 1253-1267. https://doi.org/10.1088/0967-3334/34/10/1253

An examination of neuromuscular and metabolic fatigue thresholds. / Bergstrom, Haley C.; Housh, Terry J.; Cochrane, Kristen C.; Jenkins, Nathaniel D.M.; Lewis, Robert W.; Traylor, Daniel A.; Zuniga, Jorge M; Schmidt, Richard J.; Johnson, Glen O.; Cramer, Joel T.

In: Physiological Measurement, Vol. 34, No. 10, 01.10.2013, p. 1253-1267.

Research output: Contribution to journalArticle

Bergstrom, HC, Housh, TJ, Cochrane, KC, Jenkins, NDM, Lewis, RW, Traylor, DA, Zuniga, JM, Schmidt, RJ, Johnson, GO & Cramer, JT 2013, 'An examination of neuromuscular and metabolic fatigue thresholds', Physiological Measurement, vol. 34, no. 10, pp. 1253-1267. https://doi.org/10.1088/0967-3334/34/10/1253
Bergstrom HC, Housh TJ, Cochrane KC, Jenkins NDM, Lewis RW, Traylor DA et al. An examination of neuromuscular and metabolic fatigue thresholds. Physiological Measurement. 2013 Oct 1;34(10):1253-1267. https://doi.org/10.1088/0967-3334/34/10/1253
Bergstrom, Haley C. ; Housh, Terry J. ; Cochrane, Kristen C. ; Jenkins, Nathaniel D.M. ; Lewis, Robert W. ; Traylor, Daniel A. ; Zuniga, Jorge M ; Schmidt, Richard J. ; Johnson, Glen O. ; Cramer, Joel T. / An examination of neuromuscular and metabolic fatigue thresholds. In: Physiological Measurement. 2013 ; Vol. 34, No. 10. pp. 1253-1267.
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