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Factors affecting speed in human-powered vehicles

A P White1

  • 1Computer Centre, University of Birmingham, Edgbaston, UK.

Journal of Sports Sciences
|October 1, 1994
PubMed
Summary
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For optimal human-powered vehicle (HPV) performance, a level course with no wind is ideal. Any gradient or wind resistance significantly reduces speed and overall performance in time trials.

Area of Science:

  • Sports Science
  • Biomechanics
  • Physics of Human-Powered Vehicles

Background:

  • Understanding the factors affecting human-powered vehicle (HPV) speed is crucial for optimizing athletic performance.
  • Friction, gradient, and wind resistance are key external forces impacting HPV dynamics.

Purpose of the Study:

  • To derive a cubic equation modeling the relationship between power output and HPV speed.
  • To analyze the impact of gradient and wind resistance on a racing cyclist's performance.

Main Methods:

  • Development of a cubic equation incorporating power, friction, gradient, and wind resistance.
  • Simulation of these effects using parameters for a typical racing cyclist.

Main Results:

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  • The derived equation quantifies the complex interplay of forces affecting HPV speed.
  • Analysis revealed significant decrements in performance due to non-ideal conditions.

    • Conclusions:

    • Optimal HPV time trial performance is achieved on a level course with zero wind.
    • Deviations from level and windless conditions necessitate increased power output to maintain speed, thus reducing overall performance.