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Reduction of minimal erythema dose by sweating
1Department of Dermatology, University of Tuebingen, Germany. matthias.moehrle@med.uni-tuebingen.de
Photodermatology, Photoimmunology & Photomedicine
|December 29, 2000
Summary
Sweating from heat or exercise makes skin more sensitive to UV radiation, increasing sunburn risk. This study found significant decreases in minimal erythema dose (MED/UVB) after sauna and jogging.
Area of Science:
- Dermatology
- Environmental Health
- Photobiology
Background:
- Solar ultraviolet (UV) radiation is a primary risk factor for skin cancers.
- Water baths are known to photosensitize skin to UV radiation.
- The effect of sweat on skin photosensitivity requires investigation.
Purpose of the Study:
- To determine how sweating induced by heat or physical activity influences skin photosensitivity to ultraviolet B (UVB) radiation.
Main Methods:
- Minimal erythema dose (MED) to UVB was measured in 22 healthy volunteers.
- Sweating was induced via a 10-minute sauna session or a 15-minute jogging session.
- MED/UVB testing was performed after each sweating provocation.
Main Results:
- A significant decrease in MED/UVB was observed after both heat and exercise.
- Sauna exposure resulted in a median MED/UVB decrease of 15.8% (up to 31.6%).
- Jogging resulted in a median MED/UVB decrease of 16.3% (up to 40.9%).
Conclusions:
- Sweat alters the stratum corneum's hydration, reducing UV light reflection and dispersion.
- Heat and moderate physical activity can enhance erythema response to UV radiation.
- Increased UV sensitivity due to sweating elevates sunburn risk for outdoor workers and athletes.