Infrared skin damage is affected by heat, not light. Part of the mechanism is elucidated.

 Shiseido Co., Ltd. announced on August 13 that it has independently established an experimental method to accurately evaluate the effects of infrared rays and elucidated a part of the mechanism by which infrared rays have an adverse effect on the skin.

The study concluded that the damage that infrared rays do to the skin is due to the heat produced by the infrared rays, not the infrared rays themselves.

In this study, the effects were confirmed by two methods: experiments using cells and analysis of components in the skin.

First, while controlling the temperature conditions, the fibroblasts were irradiated with infrared rays at a level that can be exposed on a daily basis, and the effects were observed.

As a result, it was found that vascular endothelial growth factor (VEGF-A) is increased by "heat" generated by infrared rays instead of "light" of infrared rays.

In addition, since VEGF-A has been suggested to be involved in skin problems such as age spots, redness, and wrinkles, it was considered that an excessive increase would have an adverse effect on the skin.

Next, when the changes in the components existing in the skin were confirmed by component analysis, the components (lipid peroxide) that cause skin troubles in the skin also increased due to the temperature (heat) during infrared irradiation. It became clear (Fig. 4).

From these results, the company concluded that the "heat" generated by the infrared rays that can be exposed on a daily basis has an adverse effect on the skin.

In addition, the company said about this research, "In order to correctly evaluate the effect of infrared rays on the skin, it is necessary to control the temperature rise, so detailed verification was difficult. Therefore, this time, the effect of infrared rays was considered to be difficult. In order to accurately evaluate the condition, we established a unique experimental method that can isolate and confirm the effects of light and heat, and proceeded with the research. "

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