Related Experiment Videos
Stroke volume response to incremental submaximal exercise in aerobically trained, active, and sedentary men
Stephen H Boutcher1, Peter F McLaren, Yvette Cotton
1Department of Physiology and Pharmacology, School of Medical Sciences, University of New South Wales, Sydney, Australia.
Summary
Aerobically trained cyclists demonstrated superior stroke volume and cardiac contractility during exercise compared to active or sedentary individuals. Even active, untrained men showed enhanced ventricular performance over sedentary men.
Area of Science:
- Cardiovascular Physiology
- Exercise Physiology
Background:
- Cardiovascular adaptations to aerobic training are well-documented.
- Understanding the specific impact of training status on stroke volume and ventricular function during exercise is crucial for optimizing athletic performance and cardiovascular health.
Purpose of the Study:
- To compare the stroke volume response and indices of ventricular performance during cycle ergometer exercise among trained cyclists, active untrained men, and sedentary men.
- To elucidate the differences in cardiac contractility and ventricular filling/emptying between different fitness levels.
Main Methods:
- Utilized impedance cardiography to measure stroke volume and other hemodynamic parameters.
- Subjects performed incremental cycle ergometer exercise.
- Compared three groups: trained cyclists (Trained, n=10), active untrained men (Active, n=10), and sedentary men (Sedentary, n=10).
Main Results:
- Trained cyclists showed a significant 27% increase in stroke volume at a heart rate of 90 beats/min, unlike Active and Sedentary groups.
- Indices of ventricular emptying and filling were significantly greater in the Trained group throughout exercise.
- Cardiac contractility was significantly higher in the Trained group compared to both Active and Sedentary groups during exercise.
- Active men exhibited significantly larger stroke volume and ventricular filling rates than Sedentary men.
Conclusions:
- Aerobic training significantly enhances stroke volume, ventricular filling, and cardiac contractility during exercise, even with similar resting cardiovascular metrics.
- Active, untrained individuals demonstrate superior ventricular performance compared to sedentary individuals, highlighting the benefits of regular physical activity.