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Cardiovascular responses to a high-volume continuous circuit resistance training protocol
Lincoln A Gotshalk1, Richard A Berger, William J Kraemer
1Department of Health and Physical Education, University of Hawaii at Hilo, Hilo, HI 96720, USA. gotshalk@hawaii.edu
Journal of Strength and Conditioning Research
|December 3, 2004
Summary
Circuit resistance training (CRT) significantly elevates heart rate and oxygen consumption, mimicking intense cardiorespiratory conditions. This training method enhances tolerance to physiological stress and high lactate concentrations.
Area of Science:
- Exercise Physiology
- Sports Science
- Cardiovascular Training
Background:
- Circuit resistance training (CRT) is a popular training modality.
- Understanding the cardiovascular demands of CRT is crucial for program design.
- Previous research has not fully elucidated the physiological stress of prolonged CRT.
Purpose of the Study:
- To quantify the cardiovascular stress induced by continuous and prolonged circuit resistance training (CRT).
- To compare the physiological responses of CRT with traditional treadmill running.
Main Methods:
- Eleven male subjects underwent submaximal and maximal treadmill tests.
- Subjects performed a CRT session: 10 exercises, 10 repetitions at 40% of 1RM, 4.6 circuits.
- Oxygen consumption (Vo2) and heart rate were continuously monitored during all protocols.
Main Results:
- CRT maintained heart rate above 70% of maximum for 16.6 minutes (over 80% for 12 minutes).
- Vo2 remained above 50% of maximum for the final 12 minutes of CRT.
- At equivalent Vo2 levels, CRT elicited a significantly higher heart rate compared to treadmill running.
Conclusions:
- Continuous, prolonged CRT imposes significant cardiovascular stress.
- CRT can be integrated into training programs to enhance tolerance to high cardiovascular demands and lactate accumulation.
- CRT offers a distinct physiological stimulus compared to continuous aerobic exercise like running.