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Computerized Dynamic Posturography for Postural Control Assessment in Patients with Intermittent Claudication
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Pedaling time variability is increased in dropped riding position.

Johnny Padulo1, Roberto Di Capua, Davide Viggiano

  • 1Faculty of Medicine and Surgery, Motor Sciences, University Tor. Vergata, Rome, Italy.

European Journal of Applied Physiology
|December 21, 2011
PubMed
Summary

Altering upper body position during cycling significantly increases cycle-to-cycle variability, impacting rhythmic muscle control. This suggests body posture influences the deterministic chaotic regulation of pedaling.

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Area of Science:

  • Biomechanics
  • Human Motor Control
  • Physiology

Background:

  • Pedaling variability, unlike gait variability, is understudied despite its relation to rhythmic muscle control.
  • Understanding pedaling variability offers insights into neuromuscular control and autonomic regulation during exercise.

Purpose of the Study:

  • To investigate how upper body position affects pedaling cycle-to-cycle duration variability.
  • To analyze the influence of pedaling variability on autonomic regulation and deterministic chaos.

Main Methods:

  • Nine healthy males pedaled on a cycle-ergometer for 10 minutes in two positions: hands on upper (UP) and lower handlebars (DP).
  • Measured time-domain variability (SDtot, SD100, SDA100) for cycling and heart rate.
  • Analyzed cycle variations using maximum Lyapunov exponents to assess deterministic chaos.

Main Results:

  • Cycle-to-cycle variability (SDtot, SD100) significantly increased in the lower handlebar position (DP) compared to the upper position (UP).
  • No significant changes were observed in cardiac parameters or other cycling measures between the two positions.
  • The maximum Lyapunov exponent was significantly more negative in the DP position, indicating increased deterministic chaos.

Conclusions:

  • Upper body position significantly influences pedaling rhythmicity control, with lower positions increasing variability.
  • Pedaling variability is regulated within a dissipative deterministic system, sensitive to postural changes.
  • These findings highlight the complex interplay between posture, neuromuscular control, and variability in cyclic movements.