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Noncircular Chainrings Do Not Influence Maximum Cycling Power.

Chee-Hoi Leong1, Steven J Elmer2, James C Martin3

  • 11 Central Connecticut State University.

Journal of Applied Biomechanics
|June 13, 2017
PubMed
Summary
This summary is machine-generated.

Noncircular chainrings did not enhance maximal cycling power or optimal pedaling rate. Cyclists adapted ankle movements to maintain preferred knee and hip actions, suggesting traditional power optimization strategies may be counterproductive.

Keywords:
angular velocitycycling biomechanicseccentricityjoint-specific poweroptimal pedaling rate

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Area of Science:

  • Biomechanics
  • Sports Science
  • Human Movement

Background:

  • Noncircular chainrings are theorized to improve cycling performance by altering leg extension/flexion and transition phases.
  • Understanding the impact of chainring design on power output and biomechanics is crucial for optimizing cycling efficiency.

Purpose of the Study:

  • To compare maximal cycling power and pedaling rate across different chainring eccentricities.
  • To analyze joint-specific kinematics and powers during maximal cycling with varying chainring designs.

Main Methods:

  • Maximal inertial-load cycling tests were conducted with 13 cyclists across three chainring conditions (CON, LOWecc, HIGHecc).
  • Maximal isokinetic cycling (120 rpm) was performed by 10 cyclists to determine joint-specific powers using pedal forces and limb kinematics.
  • Pedal and joint-specific powers were calculated using pedal forces and limb kinematics.

Main Results:

  • No significant differences were found in maximal cycling power or optimal pedaling rate across the tested chainring eccentricities.
  • Peak ankle angular velocity decreased with the HIGHecc chainring compared to the control, while knee and hip velocities remained unaffected.
  • Cyclists' self-selected ankle trajectories adapted to maintain preferred knee and hip actions, indicating a complex interplay of joint movements.

Conclusions:

  • Noncircular chainrings do not appear to enhance maximal cycling power or optimal pedaling rate in cyclists.
  • The human leg's multi-joint system allows for compensatory movements, suggesting that prolonging extension/flexion and minimizing transitions may not be optimal for maximal power.
  • Individual adaptation of ankle kinematics highlights the complexity of optimizing cycling biomechanics beyond simple chainring design.