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Estimation of cardiovascular drift through ear temperature during prolonged steady-state cycling: a study protocol
Giovanni Polsinelli1, Angelo Rodio1, Bruno Federico1
1Department of Human Sciences, Society and Health, University of Cassino and Southern Lazio, Cassino, Frosinone, Italy.
BMJ Open Sport & Exercise Medicine
|April 21, 2021
Summary
Monitoring ear temperature can help improve exercise intensity estimates by accounting for cardiovascular drift during prolonged exercise. This non-invasive method offers a practical alternative to core body temperature measurements.
Area of Science:
- Exercise Physiology
- Sports Science
- Biomedical Engineering
Background:
- Heart rate is a common, yet potentially inaccurate, measure of exercise intensity due to cardiovascular drift.
- Cardiovascular drift, characterized by increased heart rate and decreased stroke volume, can lead to overestimations of exercise intensity.
- Core body temperature increases during prolonged exercise and is linked to cardiovascular drift, suggesting temperature monitoring as a potential solution.
Purpose of the Study:
- To assess the correlation between heart rate and ear temperature during prolonged steady-state cycling.
- To evaluate the utility of ear temperature as a proxy for core body temperature in relation to cardiovascular drift.
- To explore methods for improving exercise intensity estimation during endurance activities.
Main Methods:
- 120-minute steady-state cycling at 59% heart rate reserve in a neutral environment.
- Monitoring heart rate trends throughout the exercise duration.
- Measuring ear temperature using both a contact probe (external auditory canal) and an infrared thermometer (tympanic level).
Main Results:
- Analysis of the correlation between heart rate trends and ear temperature trends.
- Quantification of cardiovascular drift's impact on heart rate during prolonged exercise.
- Evaluation of ear temperature as a reliable indicator of physiological changes related to exercise intensity.
Conclusions:
- Ear temperature monitoring shows promise as a non-invasive method to assess physiological changes during exercise.
- This approach may help to refine exercise intensity estimations by accounting for cardiovascular drift.
- External auditory canal temperature may serve as a practical alternative for monitoring exercise-induced hyperthermia and its effects on heart rate.
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