In vivo anti-infrared study by Synelvia

• The 1st approach takes advantage of the blocking power of sunscreens. All the chosen parameters (cutaneous temperature, color and microcirculation) were increased after IR radiation. Darker skin types reacted more importantly than lighter ones: they absorbed more heat and vasodilation was more important. This approach allowed to discriminate two sunscreens: sunscreen X had no effect on skin heating under IR whereas sunscreen Y reduced the 3 parameters.
• The 2nd approach studied some cellular makers of stress: oxidation and detoxification. We were able to demonstrate that a sunscreen product that limit skin heating also limit the cellular aggression (reduced generation of MDA as well as reduced needs in SOD and CAT).
These two approaches can be used in the future in order to test the IR protection of a cosmetic product.