Morning-evening differences in response to exhaustive severe-intensity exercise
1Applied Physiology Laboratory, Department of Kinesiology, Health Promotion, and Recreation, 1155 Union Circle #310769, University of North Texas, Denton, TX 76203-5017, USA.
Summary
Sport performance is better in the evening due to higher maximal oxygen uptake and anaerobic capacity. Time of day significantly impacts exercise testing and training outcomes.
Area of Science:
- Exercise Physiology
- Sports Science
- Chronobiology
Background:
- Circadian rhythms influence physiological functions, including those relevant to athletic performance.
- Understanding diurnal variations in exercise capacity is crucial for optimizing training and testing protocols.
Purpose of the Study:
- To investigate the impact of time of day on key sport performance variables.
- To determine if morning or evening exercise elicits superior physiological responses and endurance.
Main Methods:
- Twenty healthy young men underwent exhaustive cycle ergometer tests in both morning and evening conditions.
- Key performance metrics including maximal oxygen uptake, anaerobic capacity, and oxygen uptake kinetics were measured.
Main Results:
- Time to exhaustion was 20% longer in the evening compared to the morning.
- Maximal oxygen uptake was 4% higher, and anaerobic capacity was 7% higher in the evening.
- Oxygen uptake kinetics were faster in the evening, indicating more efficient energy utilization.
Conclusions:
- Diurnal variations in maximal oxygen uptake, anaerobic capacity, and oxygen uptake kinetics contribute to enhanced evening performance.
- Time of day is a significant factor that should be considered in exercise testing and training prescription.
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