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Related Experiment Video

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Determining and Controlling External Power Output During Regular Handrim Wheelchair Propulsion

Determining and Controlling External Power Output During Regular Handrim Wheelchair Propulsion

Published on: February 5, 2020

Non-random fluctuations in power output during self-paced exercise.

R Tucker¹, A Bester, E V Lambert

¹Brain Sciences Research Group, MRC/UCT Research Unit of Exercise Science and Sports Medicine, Department of Human Biology, University of Cape Town and Sport Science Institute of South Africa, Newlands, South Africa.

British Journal of Sports Medicine

|September 19, 2006

Summary

Cyclists in a 20-km time trial showed consistent power output variability, with an end spurt and 1/f-like scaling, suggesting underlying control mechanisms rather than random fluctuations.

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Area of Science:

Exercise Physiology
Sports Science
Biophysics

Background:

Understanding power output variability in cycling time trials is crucial for optimizing performance.
Self-paced exercise allows for analysis of intrinsic pacing strategies and physiological control.

Purpose of the Study:

To analyze power output fluctuations during a 20-km cycling time trial.
To characterize the level and nature of power output variability.
To investigate underlying control mechanisms.

Main Methods:

Eleven well-trained cyclists completed a 20-km time trial.
Power output was recorded every 200 meters.
Power spectrum analysis and fractal dimension (Higuchi method) were applied.

Main Results:

A significant increase in power output (end spurt) occurred in the final kilometer.
Power output exhibited 1/f-like scaling and multiple frequency peaks.
Fractal dimension scores were consistent across subjects (1.5-1.9).

Conclusions:

The end spurt indicates a global pacing strategy.
1/f-like scaling and frequency peaks suggest non-random control mechanisms.
Power output oscillations may reflect coordinated physiological control systems.