Central signals of perceived exertion during dynamic exercise

Area of Science:

• Exercise Physiology
• Sensation and Perception

Background:

• Perceived exertion is a key factor in exercise performance and adherence.
• Central signals, including physiological markers, are thought to contribute to perceived exertion.
• Previous research has explored various physiological correlates of perceived exertion, with mixed results.

Purpose of the Study:

• To review the evidence linking physiological processes to central signals of perceived exertion during dynamic exercise.
• To evaluate the role of heart rate, ventilation, and oxygen uptake as central signals of exertion.

Main Methods:

• Review of existing scientific literature on physiological responses and perceived exertion.
• Analysis of studies manipulating heart rate, ventilation, and oxygen uptake.
• Comparison of ratings of perceived exertion (RPE) under different physiological conditions.

Main Results:

• Heart rate (HR) changes did not consistently correlate with perceived exertion (RPE) when HR was experimentally altered.
• Ventilation (VE) and RPE showed corresponding changes when ventilatory drive was manipulated.
• Relative oxygen uptake (percent VO2max), rather than absolute oxygen uptake (VO2), demonstrated a stronger association with RPE.

Conclusions:

• Heart rate is unlikely to be a primary central signal for perceived exertion.
• Ventilation and relative oxygen uptake are proposed as significant central signals that modulate perceived exertion.
• These central signals may amplify local exercise sensations in proportion to metabolic demand.