Evidence of a circadian variation in 10-km laboratory running time-trial performance, where a standardised approach has been employed
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View abstract on PubMed
Summary
This summary is machine-generated.This study found a circadian rhythm in 10-km running time-trial performance in males, with performance varying significantly throughout the day. These findings suggest that training and competition schedules should consider diurnal variations for optimal results.
Area Of Science
- Exercise Physiology
- Chronobiology
- Sports Science
Background
- Diurnal variations in human performance are established, often studied under standardized protocols.
- Previous research indicates circadian rhythms influence shorter-distance running performance.
Purpose Of The Study
- To investigate the existence of a circadian variation in a laboratory-based 10-km running time-trial.
- To determine if a standardized protocol reveals diurnal performance differences in endurance running.
Main Methods
- Twelve recreationally active males completed six 10-km time-trials at different times of day (06:00, 10:00, 14:00, 18:00, 22:00, 02:00).
- Sessions were separated by 7-day intervals, with counterbalanced administration order.
- Resting intra-aural temperature and 10-km time-trial finish times were analyzed for circadian rhythms using cosine fit.
Main Results
- Both resting intra-aural temperature and 10-km time-trial finish times exhibited significant circadian rhythms (p < 0.05).
- A 24-hour rhythm was observed in 10-km time-trial performance, with a 5.0% variation.
- The timing of peak performance (acrophase) for finish time was approximately 18:44, aligning with temperature rhythms.
Conclusions
- A significant circadian variation exists for 10-km running time-trial performance in recreationally active males.
- These findings have practical implications for optimizing training and competition scheduling.
- Further research is needed to determine if these diurnal variations are present in other populations.
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