Scientific sun protection, have you mastered these key knowledge?

At height of summer, heat rolls in and light is bright, so sun protection has become a daily mandatory course for many.

However, sunscreens are not just applied, and higher sun protection factor, better. Not only will choosing wrong sunscreen not protect you from sunburn, it will also affect your health.

How can you scientifically protect yourself from sun? And how to choose a sunscreen? Today's summer health post makes everyone understand.

Sun protection in summer is very important, but higher sun protection factor, better

Prolonged or excessive exposure to ultraviolet rays can lead to skin redness, sunburn and even erythema, peeling and other phenomena, and in severe cases even skin cancer.

The sun is hot in summer, so sun protection should not be neglected. But sun protection factor is not higher better.

Anyone who has ever bought sunscreen has probably seen letters "SPF". SPF is a sun protection factor that indicates level of sun protection effectiveness that sunscreens can provide, is determined according to minimum dose of skin erythema, and is value of protection of sunscreens from ultraviolet rays.

So, what is minimum dose for skin erythema?

Redness of skin is slightest reaction of skin to exposure to sunlight. The lowest erythema dose, which is shortest sun exposure time for skin erythema. Assuming that minimum erythema dose of someone's skin is 15 minutes, then after using sunscreen with SPF 4, skin could theoretically become reddish after sun exposure 4 times (60 minutes); sunscreen, you can stay in sun 8 times (120 minutes) and so on.

Therefore, when buying sunscreen, people tend to misunderstand that "the higher SPF value, better UV protection effect." Some manufacturers even release products with SPF values ​​above 200 to meet needs of consumers. .

Actually, too high an SPF means that product uses a lot of UV absorbers and diffusers that cause unsafe and unpleasant sensations such as skin irritation and skin allergies.

Thus, depending on your actual situation, you can choose a sunscreen with an SPF value wisely.

Use different sunscreens for different situations!

Sunscreen is most common sunscreen in life. After purchasing sunscreen, many people simply apply it, which is actually unscientific. The method of using sunscreen is not static and it is best to use different sunscreens in different scenarios.

So, how do you decide which type of sunscreen to choose?

ItSo, before going out, decide what type of sunscreen to use and how high SPF value should be, depending on whether you are going to work, going for a walk, approaching sea, etc.

Here, I should also remind you that sunscreen's sunscreen effect will diminish over time, and it can be reapplied every 4-5 hours indoors; it should be reapplied every 2-3 hours outdoors; side face should be reapplied every 1-2 hours because water's edge receives not only ultraviolet rays emitted from sky, but also ultraviolet rays reflected from surface of water.

In addition to sunscreen, don't forget these harsh sunscreens

Depending on choice and method of use, sunscreen effect of sunscreen will vary from person to person, and effect of sunscreen is also unstable. To meet higher requirements for sun protection, hats, umbrellas and sun protection clothing called hard sun protection are also needed.

So, how do you choose a more efficient parasol?

Although summer is hot, it is also invigorating. Take care of sun protection and enjoy passionate summer together!

Source: Xinhua client