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Cardiovascular responses during prolonged exercise at ventilatory threshold in boys and men
C C Cheatham1, A D Mahon, J D Brown
1Human Performance Laboratory, Ball State University, Muncie, IN, USA. chris@cheatham.com
Medicine and Science in Sports and Exercise
|June 22, 2000
Summary
Cardiovascular responses during prolonged exercise are similar in boys and men. While men showed a greater tendency for cardiovascular drift, overall responses remained comparable between age groups.
Area of Science:
- Exercise Physiology
- Cardiovascular Physiology
- Pediatric Exercise Science
Background:
- Understanding age-related differences in cardiovascular responses to exercise is crucial for training and health.
- Prolonged exercise elicits physiological adaptations that can vary between developmental stages.
Purpose of the Study:
- To investigate and compare cardiovascular responses between adolescent boys and adult men during sustained exercise.
- To analyze responses at an intensity matched to the ventilatory threshold (VT).
Main Methods:
- Eight boys (10-13 years) and ten men (18-25 years) underwent maximal and submaximal exercise tests.
- Exercise intensity was standardized to the oxygen consumption at ventilatory threshold (VT).
- Cardiovascular variables including heart rate, stroke volume, and blood pressure were monitored over 40 minutes.
Main Results:
- Boys exhibited higher heart rate and lower stroke volume compared to men.
- Both groups showed increases in heart rate and decreases in stroke volume over time, with a trend for greater changes in men.
- Men had higher mean arterial blood pressure, which decreased over time, while boys' blood pressure remained stable.
Conclusions:
- Cardiovascular responses during prolonged exercise are largely similar between boys and men.
- A tendency for greater cardiovascular drift was observed in men, though not statistically significant.
- Plasma volume decrease was more pronounced in men but did not correlate with stroke volume changes.
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