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Area of Science:

  • Exercise Physiology
  • Sports Science
  • Human Performance

Background:

  • Understanding the psychological and physiological factors influencing exercise performance is crucial for optimizing training and competition.
  • Information feedback, particularly regarding time, can significantly impact an athlete's perception and physiological responses during exertion.

Purpose of the Study:

  • To investigate the impact of providing information on remaining time on physiological and perceptual responses during intermittent exercise in trained cyclists.

Main Methods:

  • Ten trained cyclists completed an intermittent cycling protocol (4 min low-intensity, 1 min high-intensity) under three conditions: open-loop (no time information), closed-loop (time information), and a shorter closed-loop duration.
  • Physiological measures included oxygen consumption (VO2) and electromyographic signals (EMG) of muscle activity.
  • Perceptual responses were assessed via rating of perceived exertion (RPE).

Main Results:

  • Oxygen consumption and muscle activity were lower in the open-loop condition compared to the closed-loop condition (40 min).
  • Lower VO2 values were observed in the open-loop condition compared to the 20-min closed-loop condition during high-intensity intervals.
  • Electromyographic activity was significantly lower in the open-loop condition at 40 min, while muscle activation patterns differed between conditions.

Conclusions:

  • Information on remaining time can influence peripheral physiological responses, even when power output is maintained.
  • This suggests a 'saving component' mechanism activated by time information, potentially to mitigate energy expenditure during prolonged physical exertion.