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Efficiency of trained cyclists using circular and noncircular chainrings.
L K Cullen1, K Andrew, K R Lair
1Department of Physical Education, Eastern Illinois University, Charleston 61920.
International Journal of Sports Medicine
|April 1, 1992
Summary
This study found that noncircular chainrings offer no significant efficiency advantage over traditional circular chainrings for trained cyclists. Performance metrics like oxygen consumption and heart rate remained similar across both chainring types.
Area of Science:
- Sports Science
- Exercise Physiology
- Biomechanics
Background:
- Cyclists often seek equipment to enhance performance.
- Noncircular chainrings are marketed as a potential improvement over traditional circular designs.
Purpose of the Study:
- To compare the physiological responses of trained cyclists using noncircular versus circular chainrings.
- To assess oxygen consumption (VO2), heart rate (HR), and perceived exertion (RPE) under varying conditions.
Main Methods:
- Seven trained male cyclists participated.
- Subjects cycled using both noncircular and circular chainrings at two gear ratios (5.92m and 7.33m) and three cadences (50, 70, 90 rpm).
- Measurements included VO2, HR, RPE, and respiratory exchange ratio (RER).
Main Results:
- No significant differences were observed in VO2, HR, or RPE between noncircular and circular chainrings.
- Physiological demands varied as expected with changes in gear and cadence.
- The highest oxygen consumption was 83.4% of VO2max at 7.33m gear and 90 rpm.
Conclusions:
- Noncircular chainrings did not demonstrate superior efficiency compared to standard circular chainrings in trained cyclists.
- The findings suggest that claims of improved cycling efficiency with noncircular chainrings are not supported by this study's physiological data.