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Related Experiment Videos

The reliability of cycling efficiency.

L Moseley1, A E Jeukendrup

  • 1School of Sport and Exercise Sciences, University of Birmingham, Edgbaston, Birmingham, B15 2TT, United Kingdom.

Medicine and Science in Sports and Exercise
|April 3, 2001
PubMed
Summary

This study found that graded exercise tests reliably measure gross efficiency (GE) and exercise economy (EC), but delta efficiency (DE) measurements were more variable. These findings confirm the reproducibility of key metabolic measurements during cycling.

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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Human Performance

Background:

  • Assessing exercise efficiency is crucial for understanding energy expenditure during physical activity.
  • Reproducibility of metabolic measurements like gross efficiency (GE), delta efficiency (DE), and exercise economy (EC) is essential for reliable research and training assessments.
  • Graded exercise tests are commonly used to evaluate cardiorespiratory fitness and metabolic responses.

Purpose of the Study:

  • To determine the reproducibility of gross efficiency (GE), delta efficiency (DE), and exercise economy (EC) in male subjects.
  • To evaluate the reliability of these metabolic parameters during a graded cycle ergometer test.
  • To establish whether a standard graded exercise protocol yields consistent measurements of energy efficiency.

Main Methods:

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  • Seventeen male subjects completed three identical graded cycle ergometer tests at 80 rpm.
  • Energy expenditure was calculated using oxygen uptake (VO(2)) and carbon dioxide production (VCO(2)) measurements via stoichiometric equations.
  • The graded test involved 3-minute stages with 35-W increments.

Main Results:

  • Average coefficients of variation were 4.2% for GE, 6.7% for DE, and 3.3% for EC, indicating good reproducibility for GE and EC.
  • Gross efficiency (GE) varied significantly across different power outputs, being lower at lower workloads (95 W, 130 W).
  • A weak correlation was observed between peak oxygen uptake (VO(2peak)) and GE (r = 0.491), with no significant correlations for DE or EC.

Conclusions:

  • A graded exercise test protocol with 3-min stages and 35-W increments allows for reproducible measurements of GE and EC.
  • Measurements of delta efficiency (DE) demonstrated slightly higher variability compared to GE and EC.
  • The study confirms the utility of this graded exercise test for obtaining reliable metabolic efficiency data.