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Physiological differences between black and white runners during a treadmill marathon
A N Bosch1, B R Goslin, T D Noakes
1Department of Physiology, University of Cape Town Medical School, South Africa.
Summary
Black South African runners outperform white runners due to physiological differences. Black runners exhibit a higher ventilation threshold and run marathons at a higher percentage of VO2max, despite similar VO2max levels.
Area of Science:
- Exercise Physiology
- Sports Science
- Human Performance
Background:
- Black South African runners demonstrate superior performance in marathon running compared to white runners.
- Understanding the physiological factors contributing to this performance gap is crucial for sports science research.
Purpose of the Study:
- To investigate the physiological differences between elite black and white South African distance runners.
- To identify key performance indicators such as maximal oxygen consumption (VO2max) and ventilation threshold (VThr) that may explain performance disparities.
Main Methods:
- Matched sub-elite black and white runners based on marathon times.
- Measured VO2max, maximal workload (Lmax), VThr, running economy, inspiratory ventilation (VI), tidal volume (VT), breathing frequency (f), and respiratory exchange ratio (RER).
- Utilized maximal treadmill testing and 42.2 km treadmill marathon simulations.
Main Results:
- Black runners had lower maximal workload (Lmax) and maximal inspiratory ventilation (VI max) due to smaller body size affecting tidal volume (VT).
- Ventilation threshold (VThr) occurred at a higher percentage of VO2max in black runners (82.7% vs 75.6%).
- During marathon simulation, black runners ran at a higher percentage of VO2max (76% vs 68%) and higher breathing frequency (f) with lower VT, resulting in similar VI.
Conclusions:
- Black runners' superior marathon performance may be linked to their ability to sustain a higher percentage of VO2max during prolonged exercise.
- Physiological adaptations, including a higher VThr and altered breathing patterns during exertion, contribute to the performance advantage of black distance runners.