German scientists report that about 55% of people
misuse sunscreen. According to
preliminary research results wrong application is not
protects skin from harmful ultraviolet
radiation.
Contents
What exactly can not be done?
Many consumers tend to use sunscreen
wrong because of their own stinginess. Early research
showed that Danish tourists spend only 0.79 mg per cm2 of lotion
on vacation instead of 2 mg. Another disadvantage was that they started
Apply the cream on the beach only after the appearance of redness.
All participants returned from vacation with a visible tan.
People also probably suffered chronic minor damage.
skin that does not occur after applying more than 0.75 mg / cm2.
Scientists did not evaluate the effect of redness on the skin, as in
most other studies. The end point of their research
was the amount of dimercyclobutane-pyrimidine that were
determined by mass spectroscopy during skin biopsy.
Dimercyclobutane-pyrimidine is a chemical bond between
nearby bases that damage genetic material.
Most damage is repaired. However in old age when
reducing enzymes stop working without crashing
skin cancer.
What experiments were conducted?
In the first experiment, the skin was irradiated after applying the lotion. On
areas of skin where people applied 0.75 mg / cm2, significant
no protective effect was observed. Only with a dose of 1.2 and 2.0 mg / cm2
the formation of a toxic substance could have been largely
to prevent.
In the second experiment, the skin was irradiated for several days,
to mimic a five-day stay in a tropical or
subtropical regions.
A satisfactory protective effect was also achieved only
with the use of 1.2 and 2.0 mg / cm2. With a high dose of radiation in
a day there was more DNA damage.
Dermatology underestimate the protective effect and correct
cream application?
Even dermatologists underestimate the protective effect of sunscreens.
creams. This is reported by scientists from the Institute for Human Development
Max Planck.
261 dermatologists from Germany, USA, Switzerland and Australia
participated in a web experiment. Information about the effectiveness of creams
It was presented to doctors in three different ways:
- sun protection factor itself;
- the percentage of sunscreen on the skin;
- процентное содержание солнечного radiation.
Dermatologists should evaluate in pairs how long the protective
a period of stronger than a less strong cream.
The result shows that a longer protection period
which have stronger sunscreens systematically
underestimates the vast majority of dermatologists.
According to scientists, dermatologists should focus
solely on the sun protection factor when evaluating and studying
sunscreen efficacy. Other indicators such as
absorbed sunscreen radiation or redness of the skin,
not suitable for performance evaluation.
Ultraviolet does not cause skin cancer, or why from sunscreen
creams should not expect a “wow effect”
The effect of ultraviolet radiation on cancer is not so obvious when
malignant melanoma, as with spinalioma or basalioma.
The US Environmental Protection Agency even doubts that
that sunscreens protect against cancer.
Animals usually become infected with melanoma at the age of 12.5
months. When the shaved back is irradiated with ultraviolet, the tumor
появились в возрасте 7 months.
The same UV exposure never causes melanoma.
in normal mice.
Scientists conclude that ultraviolet light is not
trigger melanoma. Solar radiation however
significantly accelerates the development of cancer. Sunscreen
The cream can slow the development of melanoma, but not completely
suppress.
The phenomenon explains why even people who
regularly apply sun factors, can get sick
melanoma. Sunscreen protects against melanoma, but not
as reliable as previously thought.
