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Muscle recruitment patterns regulate physiological responses during exercise of the same intensity.
M R Deschenes1, W J Kraemer, R W McCoy
1Department of Kinesiology, The College of William & Mary, Williamsburg, Virginia 23187-8795, USA. ardesc@wm.edu
Summary
Lower cadence cycling (40 rpm) causes greater physiological stress than higher cadence (80 rpm) at the same oxygen uptake (VO2). This is due to increased muscle activation, leading to higher heart rate, blood pressure, lactate, and perceived exertion.
Area of Science:
- Exercise Physiology
- Sports Science
- Human Physiology
Background:
- Cycling cadence influences physiological responses during exercise.
- Understanding the impact of different cadences on stress markers is crucial for training optimization.
Purpose of the Study:
- To compare the physiological and psychophysiological stress of cycling at 40 rpm versus 80 rpm at the same relative intensity (50-55% VO2 peak).
Main Methods:
- Ten men completed 30-minute cycling sessions at 40 rpm and 80 rpm.
- Measurements included rectal temperature, heart rate, mean arterial pressure, plasma lactate, glucose, insulin, cortisol, and rating of perceived exertion.
- Electromyography assessed quadriceps activation.
Main Results:
- Higher heart rate, prolonged elevated mean arterial pressure, and persistent plasma lactate were observed at 40 rpm compared to 80 rpm.
- Cortisol levels increased only at 40 rpm.
- Rating of perceived exertion was higher at the lower cadence.
Conclusions:
- Cycling at a lower cadence (40 rpm) induces greater physiological and psychophysiological stress than at a higher cadence (80 rpm) when oxygen uptake is matched.
- Cadence-specific muscle activation patterns significantly influence exercise stress responses.