Factors affecting the estimation of physical working capacity at the fatigue threshold

Herbert A. deVries, Terry J. Housh, Glen O. Johnson, Sharon A. Evans, Gerald D. Tharp, Dona J. Housh, Rommie A. Hughes, Glen O. Johnson

Research output: Contribution to journalArticle

41 Citations (Scopus)

Abstract

The purpose of this study was to investigate potential improvements in the methodology associated with the Physical Working Capacity at the Fatigue Threshold (PWC FT ) test including: (1) the use of a continuous test protocol; (2) the use of a treadmill; (3) the use of a bipolar EMG lead system for noisy electronic environments; and (4) the potential for residual fatigue from tests repeated 24 hours apart. The results of the continuous test protocol (X¯ ± S.D. = 210±73 watts) correlated well (r = 0·856) with the original discontinuous technique (222± 83 watts) and there was no significant (p> 0·05) difference between the mean values (t= 1·146). Treadmill testing required a bipolar lead system to counteract the electrical noise generated by the treadmill motor. The heart rate values which corresponded to PWC FT on the treadmill (W¯+s.d. = 164±b.p.m.) and bicycle ergometer (153 ± 18 b.p.m.) were highly correlated (r=0·833) and there was no significant (p>0·05) difference between the mean values (t= 2·22). The use of a bipolar lead EMG system on the bicycle ergometer resulted in significantly (p<0·05) smaller voltage for any given power output, and the PWC FT exhibited a low to moderate correlation (r=0·60) with PWC FM derived from a unipolar arrangement. The test-retest results of discontinuous PWC FM measurements performed 24 hours apart on the bicycle ergometer were correlated at r=0·812 with no significant (p>0·05) difference (=0·52) between the mean values (test=198±60; retest=191±63 watts).It was concluded that the continuous protocol using a bicycle ergometer should be considered an attractive alternative to the original discontinuous PWC FM test, and daily testing (using the discontinuous procedures) resulted in no residual fatigue. The use of a treadmill or bipolar lead system for the determination of PWC FM requires further study with respect to both validity and reproducibility.

Original languageEnglish (US)
Pages (from-to)25-33
Number of pages9
JournalErgonomics
Volume33
Issue number1
DOIs
StatePublished - Jan 1990

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Exercise equipment
fatigue
Fatigue
Fatigue of materials
bicycle
Bicycles
Lead
Noise
Heart Rate
Testing
electronics
methodology

Keywords

  • Electromyography
  • Fatigue threshold
  • Physical working capacity

ASJC Scopus subject areas

  • Human Factors and Ergonomics
  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

deVries, H. A., Housh, T. J., Johnson, G. O., Evans, S. A., Tharp, G. D., Housh, D. J., ... Johnson, G. O. (1990). Factors affecting the estimation of physical working capacity at the fatigue threshold. Ergonomics, 33(1), 25-33. https://doi.org/10.1080/00140139008927091

Factors affecting the estimation of physical working capacity at the fatigue threshold. / deVries, Herbert A.; Housh, Terry J.; Johnson, Glen O.; Evans, Sharon A.; Tharp, Gerald D.; Housh, Dona J.; Hughes, Rommie A.; Johnson, Glen O.

In: Ergonomics, Vol. 33, No. 1, 01.1990, p. 25-33.

Research output: Contribution to journalArticle

deVries, HA, Housh, TJ, Johnson, GO, Evans, SA, Tharp, GD, Housh, DJ, Hughes, RA & Johnson, GO 1990, 'Factors affecting the estimation of physical working capacity at the fatigue threshold', Ergonomics, vol. 33, no. 1, pp. 25-33. https://doi.org/10.1080/00140139008927091
deVries, Herbert A. ; Housh, Terry J. ; Johnson, Glen O. ; Evans, Sharon A. ; Tharp, Gerald D. ; Housh, Dona J. ; Hughes, Rommie A. ; Johnson, Glen O. / Factors affecting the estimation of physical working capacity at the fatigue threshold. In: Ergonomics. 1990 ; Vol. 33, No. 1. pp. 25-33.
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