Optic flow influences perceived exertion and distance estimation but not running pace

Area of Science:

• Exercise Physiology
• Perception and Cognition
• Biomechanics

Background:

• Optic flow, the apparent motion of objects in the visual field, influences self-motion perception.
• Understanding how optic flow affects running perception is crucial for training and performance.

Purpose of the Study:

• To investigate the impact of varying optic flow rates on perceived and actual running pace.
• To assess the relationship between optic flow, perceived distance, and rating of perceived exertion (RPE).

Main Methods:

• Twelve male runners completed self-paced 5-km time trials under normal, slow (-25%), and fast (+25%) optic flow conditions.
• Participants reported their RPE at perceived kilometer marks during each trial.

Main Results:

• No significant differences in 5-km completion times or actual running pace were observed across optic flow conditions.
• Slower optic flow led to a greater perceived distance covered per kilometer.
• Normalized RPE was lower under slow optic flow conditions compared to normal and fast conditions.

Conclusions:

• Optic flow significantly alters the perception of running distance, with slower flow elongating perceived distance.
• Lower perceived exertion at slower optic flow contradicts predictions from RPE template models and other pacing theories.