Optimal power-to-mass ratios when predicting flat and hill-climbing time-trial cycling

A. M. Nevill, S. A. Jobson, R. C R Davison, A. E. Jeukendrup

Research output: Contribution to journalArticleResearchpeer-review

13 Citations (Scopus)

Abstract

The purpose of this article was to establish whether previously reported oxygen-to-mass ratios, used to predict flat and hill-climbing cycling performance, extend to similar power-to-mass ratios incorporating other, often quick and convenient measures of power output recorded in the laboratory [maximum aerobic power (WMAP), power output at ventilatory threshold (WVT) and average power output (WAVG) maintained during a 1 h performance test]. A proportional allometric model was used to predict the optimal power-to-mass ratios associated with cycling speeds during flat and hill-climbing cycling. The optimal models predicting flat time-trial cycling speeds were found to be (WMAPm-0.48) 0.54, (WVTm-0.48)0.46 and (WAVGm-0.34)0.58 that explained 69.3, 59.1 and 96.3% of the variance in cycling speeds, respectively. Cross-validation results suggest that, in conjunction with body mass, WMAP can provide an accurate and independent prediction of time-trial cycling, explaining 94.6% of the variance in cycling speeds with the standard deviation about the regression line, s = 0.686 km h-1. Based on these models, there is evidence to support that previously reported V̇O-to-mass ratios associated with flat cycling speed extend to other laboratory-recorded measures of power output (i.e. Wm-0.32). However, the power-function exponents (0.54, 0.46 and 0.58) would appear to conflict with the assumption that the cyclists' speeds should be proportional to the cube root (0.33) of power demand/expended, a finding that could be explained by other confounding variables such as bicycle geometry, tractional resistance and/or the presence of a tailwind. The models predicting 6 and 12% hill-climbing cycling speeds were found to be proportional to (WMAPm-0.91)0.66, revealing a mass exponent, 0.91, that also supports previous research.

Original languageEnglish
Pages (from-to)424-431
Number of pages8
JournalEuropean Journal of Applied Physiology
Volume97
Issue number4
DOIs
Publication statusPublished - 1 Jul 2006
Externally publishedYes

Keywords

  • Average power output (W)
  • Cycling speed
  • Maximal aerobic power (W)
  • Power at ventilatory threshold (W)
  • Power supply and demand

Cite this

Nevill, A. M., Jobson, S. A., Davison, R. C. R., & Jeukendrup, A. E. (2006). Optimal power-to-mass ratios when predicting flat and hill-climbing time-trial cycling. European Journal of Applied Physiology, 97(4), 424-431. https://doi.org/10.1007/s00421-006-0189-6
Nevill, A. M. ; Jobson, S. A. ; Davison, R. C R ; Jeukendrup, A. E. / Optimal power-to-mass ratios when predicting flat and hill-climbing time-trial cycling. In: European Journal of Applied Physiology. 2006 ; Vol. 97, No. 4. pp. 424-431.
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Nevill, AM, Jobson, SA, Davison, RCR & Jeukendrup, AE 2006, 'Optimal power-to-mass ratios when predicting flat and hill-climbing time-trial cycling', European Journal of Applied Physiology, vol. 97, no. 4, pp. 424-431. https://doi.org/10.1007/s00421-006-0189-6

Optimal power-to-mass ratios when predicting flat and hill-climbing time-trial cycling. / Nevill, A. M.; Jobson, S. A.; Davison, R. C R; Jeukendrup, A. E.

In: European Journal of Applied Physiology, Vol. 97, No. 4, 01.07.2006, p. 424-431.

Research output: Contribution to journalArticleResearchpeer-review

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AU - Nevill, A. M.

AU - Jobson, S. A.

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Nevill AM, Jobson SA, Davison RCR, Jeukendrup AE. Optimal power-to-mass ratios when predicting flat and hill-climbing time-trial cycling. European Journal of Applied Physiology. 2006 Jul 1;97(4):424-431. https://doi.org/10.1007/s00421-006-0189-6