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Kinetic changes in sweat lactate following fatigue during constant workload exercise
Hiroki Okawara1, Tomonori Sawada1, Daisuke Nakashima1
1Department of Orthopaedic Surgery, Keio University School of Medicine, Shinjuku, Japan.
Physiological Reports
|January 19, 2022
Summary
Investigating athlete fatigue using wearable sweat sensors reveals significant changes in sweat lactate elimination curves post-exercise. These findings suggest potential for sweat analysis in fatigue assessment.
Area of Science:
- Sports Physiology
- Biomedical Engineering
- Wearable Technology
Background:
- Fatigue significantly impacts athletic performance and physiological responses.
- Wearable noninvasive sensors, particularly sweat sensors, offer a practical method for continuous physiological monitoring.
- Understanding fatigue-related changes in physiological markers is crucial for optimizing training and preventing overexertion.
Purpose of the Study:
- To investigate changes in sweat lactate elimination curves following fatigue induced by constant workload exercise.
- To assess the utility of wearable sweat sensors in detecting fatigue-related physiological alterations.
- To explore the relationship between subjective fatigue and objective sweat markers.
Main Methods:
- A cross-sectional study involving 17 recreationally trained males.
- Two constant workload exercise tests (25% peak power) were conducted, with Test 1 performed to exhaustion.
- Subjective fatigue, sweat lactate, and sweat rate were measured using wearable sensors during a 10-minute recovery period post-exercise.
Main Results:
- Subjective fatigue significantly increased after the exhaustive exercise bout (Test 1).
- The sweat lactate elimination curve showed a significant leftward shift post-fatigue.
- Peak and constant sweat lactate values were observed significantly sooner (p < 0.01) after Test 1.
Conclusions:
- The sweat lactate elimination curve is altered in a state of fatigue.
- Wearable sweat sensor data, specifically the lactate elimination curve, may serve as a valuable indicator for evaluating athlete fatigue.
- Further research is warranted to validate and apply these findings in practical fatigue assessment protocols.
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