Related Experiment Videos
Breathing pattern during exercise in young black and Caucasian subjects
Journal of Applied Physiology (Bethesda, Md. : 1985)
|June 1, 1987
Summary
Black subjects exhibit lower lung volumes, leading to a higher breathing frequency and lower tidal volume during exercise compared to Caucasians. This indicates distinct ventilatory adaptations to physical exertion between racial groups.
Area of Science:
- Exercise Physiology
- Pulmonary Function
- Human Physiology
Background:
- Lung volumes are reportedly 10-15% lower in Black subjects compared to Caucasians when matched for sex, age, height, and weight.
- Understanding the impact of these lung volume differences on ventilatory adaptation during exercise is crucial for exercise physiology research.
Purpose of the Study:
- To investigate whether reduced lung volumes in Black subjects influence their ventilatory response to incremental exercise.
- To compare minute ventilation (VE) and its components (tidal volume and frequency) during exercise between Black and Caucasian individuals.
Main Methods:
- Eighteen Caucasian and 14 Black subjects (ages 8-30 years) underwent incremental cycle-ergometer exercise.
- Measurements included vital capacity (VC), functional residual capacity/total lung capacity, minute ventilation (VE), breathing frequency (f), tidal volume (VT), and respiratory cycle durations.
- Data were collected at rest and during incremental work loads from 0.6 to 2.4 W/kg.
Main Results:
- Black subjects demonstrated significantly lower VC and higher functional residual capacity/total lung capacity ratios.
- Minute ventilation (VE) was consistently higher in Black subjects across all work loads, reaching statistical significance at 0.6 and 1.5 W/kg.
- Black subjects achieved higher VE through increased breathing frequency (f) and reduced tidal volume (VT), with proportional shortening of inspiratory and expiratory times.
Conclusions:
- Differences in lung volumes between Black and Caucasian subjects are associated with distinct ventilatory adaptations during exercise.
- Black subjects exhibit a breathing pattern characterized by higher frequency and lower tidal volume to achieve minute ventilation.
- These findings suggest potential differences in respiratory pressure-volume relationships or breathing strategies relative to lung volumes between the studied racial groups.