Development of a servo-controller of heart rate using a cycle ergometer

Area of Science:

• Exercise Physiology
• Biomedical Engineering
• Control Systems

Background:

• Precise control of exercise intensity is crucial for maximizing training efficacy and minimizing risks.
• Heart rate (HR) is a commonly used physiological marker for monitoring and adjusting exercise intensity.
• Existing methods for exercise intensity control may lack precision and responsiveness.

Purpose of the Study:

• To develop and evaluate a servo-controller system for precise heart rate regulation using a cycle ergometer.
• To optimize the controller's performance for rapid and stable heart rate responses.
• To assess the controller's effectiveness in maintaining target exercise intensities in healthy volunteers.

Main Methods:

• Development of a servo-controller for heart rate adjustment on a cycle ergometer.
• Estimation of the transfer function relating work rate to heart rate.
• Computer simulation for optimizing feedback control parameters.
• Performance evaluation in 55 healthy volunteers targeting 60% and 75% of age-predicted maximum heart rate.

Main Results:

• The servo-controller demonstrated the ability to precisely regulate heart rate during exercise.
• Time to reach 90% of target HR was approximately 136-137 seconds.
• Steady-state differences between target and measured HR were minimal (2.5-3.8 beats/min).

Conclusions:

• The developed servo-controller enables accurate and reliable control of heart rate during exercise.
• This precise HR regulation facilitates effective control of exercise intensity.
• The system holds potential for optimizing exercise training protocols and enhancing safety.