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Optic flow influences perceived exertion during cycling.

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Area of Science:

  • Exercise Physiology
  • Visual Perception
  • Sports Science

Background:

  • Optic flow, the apparent motion of objects in the visual field, influences our perception of self-motion.
  • Previous research has explored optic flow's role in spatial navigation and balance.
  • Its specific impact on perceived exertion during physical activity, like cycling, remains less understood.

Purpose of the Study:

  • To investigate how manipulated optic flow rates affect perceived exertion and physiological responses during cycling.
  • To determine if altering visual speed cues can modulate a cyclist's subjective experience of effort and objective performance.

Main Methods:

  • Fifteen participants completed a 20-km cycling time trial (TTNORM) representing actual speed.
  • Participants then completed three counterbalanced 20-km trials with optic flow altered: -15% (TTSLOW) and +15% (TTFAST) of actual speed, presented via projected video.
  • Power output, ratings of perceived exertion (RPE), heart rate, and cadence were measured.

Main Results:

  • Lower power output and RPE were observed during TTSLOW compared to TTNORM and TTFAST.
  • No significant differences in heart rate or cadence were found across conditions.
  • This indicates a direct link between slower optic flow and reduced perceived exertion.

Conclusions:

  • The rate of optic flow significantly influences perceived exertion during cycling.
  • Slower optic flow is associated with lower RPE and higher power output, suggesting a potential for visual interventions in training.
  • This study provides novel evidence for the modulatory effect of visual feedback on exercise intensity perception.