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Association Between Deoxygenated Hemoglobin Breaking Point, Anaerobic Threshold, and Rowing Performance.
International Journal of Sports Physiology and Performance
|February 1, 2019
Summary
The deoxygenated hemoglobin breaking point ([HHb]BP) and anaerobic threshold (AnT) show similar physiological responses in rowers. While [HHb]BP can distinguish performance levels, its high random error limits its practical use in training and testing.
Area of Science:
- Exercise Physiology
- Sports Science
- Skeletal Muscle Physiology
Background:
- The anaerobic threshold (AnT) is a key indicator of endurance performance.
- Deoxygenated hemoglobin ([HHb]) changes in muscle can reflect exercise intensity.
- The deoxygenated hemoglobin breaking point ([HHb]BP) is a potential non-invasive marker of exercise intensity.
Purpose of the Study:
- To compare the intensity and physiological responses of [HHb]BP and AnT during incremental exercise.
- To assess the association between [HHb]BP and AnT with 2000-m rowing performance.
Main Methods:
- 13 well-trained male rowers performed a step incremental test.
- Measurements included gas exchange, vastus lateralis [HHb], and blood lactate.
- Power output, V˙O2, and heart rate at [HHb]BP and AnT were determined and compared.
Main Results:
- No significant differences were found between [HHb]BP and AnT for power output, V˙O2, or heart rate.
- High typical error of estimate and wide limits of agreement were observed for all measured variables.
- Both [HHb]BP (r = .70) and AnT (r = .89) correlated significantly with 2000-m mean power.
Conclusions:
- A breaking point in vastus lateralis [HHb] ([HHb]BP) during incremental exercise can differentiate rower performance levels.
- Despite correlating with performance, the high random error associated with [HHb]BP compromises its utility for training and testing in rowing.
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