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External auditory canal temperature and reaction time relationship during long performances
H Almirall1, R Ferrer, M Sànchez-Turet
1Departament de Psiquiatria i Psicobiologia Clinica, Facultat de Psicologia, Universitat de Barcelona, Spain.
Summary
This study investigated body temperature and reaction time (RT) to test Kleitman's Basic Rest-Activity Cycle (BRAC) hypothesis. While RT performance showed no ultradian rhythm, some subjects exhibited BRAC-like temperature fluctuations.
Area of Science:
- Chronobiology
- Human Physiology
- Cognitive Neuroscience
Background:
- Kleitman's hypothesis proposes a Basic Rest-Activity Cycle (BRAC) influencing physiological and performance rhythms.
- Understanding ultradian rhythms is crucial for optimizing human performance and well-being.
Purpose of the Study:
- To investigate the relationship between body temperature and reaction time (RT).
- To test Kleitman's Basic Rest-Activity Cycle (BRAC) hypothesis using objective physiological and performance measures.
Main Methods:
- 24 subjects performed RT tasks every 10 minutes for 320 minutes.
- Bilateral ear canal temperatures were continuously monitored.
- Time series analyses were applied to RT and temperature data.
Main Results:
- No significant 90-100 minute ultradian rhythmicity was detected in reaction time performance.
- Six out of 24 subjects showed significant temperature fluctuations within the expected BRAC period.
Conclusions:
- The study did not find consistent evidence for BRAC affecting reaction time performance across all subjects.
- Individual variations in temperature rhythms suggest potential BRAC influence in a subset of the population.