Many people notice their skin becoming dull and dark even while exercising. Especially when using a treadmill at the gym or at home, or doing home workouts near a window, you might wonder, "Why does my skin look tanned when I barely go outside?" Let's explore the effects of indoor exercise on your skin.

The Impact of UV Rays Indoors

Experts emphasize that being indoors does not completely shield you from the effects of UV rays. Recently, there's been growing interest in "indoor UV exposure," with analyses suggesting that sunlight exposure through large glass windows could contribute to skin pigmentation and photoaging.

UVA Penetration Indoors

Ultraviolet rays are broadly divided into UVA and UVB. While UVB cannot penetrate glass, UVA can enter indoors through windows. This UVA penetrates deep into the skin, potentially affecting pigmentation and photoaging. Research indicates that prolonged exposure to sunlight near windows may be linked to skin aging, and there are cases where one side of the face can become duller from long indoor workouts during peak sunlight hours.

Exercising Near Windows: Its Effect on Skin

During indoor exercise, your skin can become temporarily sensitive due to sweat and heat. Prolonged exposure to UV rays coming through windows in this state increases the likelihood of skin irritation. This is especially true for those who exercise on treadmills or stationary bikes placed near windows, as their light exposure time can be extended.

• Use sunscreen during indoor exercise.
• Be mindful of sun exposure in gyms with large windows and in cafe-style fitness spaces.
• It's important to wash off sweat and sebum immediately after exercising.

Blue Light and Skin Health

Recently, research has been conducted on the effects of blue light emitted from smartphones, tablets, and LED lighting on the skin. While its impact hasn't been as definitively proven as UV rays, there are reports suggesting that prolonged exposure to high-energy visible light (HEV light) can affect pigmentation and skin stress.

In conclusion, you shouldn't neglect skin care just because you're exercising indoors. If you frequently exercise near windows, especially during the day, it's advisable to apply a light layer of sunscreen and wash off sweat and sebum immediately after your workout to minimize skin irritation. Remember that skin aging is influenced not only by outdoor activities but also by "how long you are exposed to light indoors."