fitness articles

Harmful Radiations Of The Sun

The sun emits three form of radiation infrared, visible and ultraviolet. Infra red and visible light are valuable because they provide warmth and the ability to see. Ultraviolet rays can be harmful depending on their wave-lenght:- UVA (longest), UVB (middle length) and UVC (shortest). Each one them penetrates the atmosphere and affects our health in different ways.

UVB Rays:  These rays are absorbed into the epidermis and can cause skin cancer by altering the normally well-organized behavior of cells. By breaking down the collagen and elastin building blocks they can create , by further causing wrinkles, clumping up the protein, weakening the walls of small blood vessels and spider veins etc.

UVA Rays: These rays can be as harmful as UVB rays. UVA is absorbed into the epidermis and pass through the dermis. They remain in high intensity all day long and not just peak hours of 10 a.m. to 2 p.m. unlike the UVB rays.
 

UVB and UVA rays can both damage the protecting covering of eyes known as Cornea. The resulting damage to the lens and the retina may cause cataract and visual acuity problems.
 

The sun also affects the immune system UVB and particularly the UVA rays can damage the langerhans cells, which are important component of immune system within the skin. UV rays can damage the WBC  (White Blood Cells) as well, rendering them important in face of the enemy. In addition damage to the langerhans cells and WBC can reduce the effectiveness of the immune system leading to vulnerability of the skin to viruses and other diseases.

UVC Rays: These rays are absorbed in the ozone layer and if small amounts of these rays succeed in passing through, they are absorbed in the epidermis of the skin.

Protecting With a Sunscreen

Sunscreens are available in the market in the form of creams, gels, lotions, sprays and ointments. They contain various agents which have been proven to protect the skin against the rays of the sun.

Para-amino-benzoic acid or PABA, PABA esters (glycerol, padimate A, padimate O, or octyl dimenthyl PABA) and cinnamates are agents which are effective in protecting the skin against UVB rays. Benzophenones (oxybenzone, methoxybenzone and sulfisobenzone) and Parsol are effective in protecting against UVA rays.

To totally protect your skin, select a sunscreen with a combination of two of these agents, one of UVA rays and one of UVB. Take the help of a dermatologist to chose a product that suits your skin type. Also, at the same time pass a test on hand before applying it on the face.

Some factors need to be considered while choosing a sunscreen:

• Does it protect my skin or do I have signs of sun exposure?

• Is it too occlusive and sticky?

• Do I break on pimples when I use it?

• Do I break out a rash?

Depending on these factors you can pick a sunscreen from the options available :

• If you have a dry skin avoid using tretinoin (Retin-A, Stieva-A, Retisol-A, Refuva-A, Renova, Vit A Acid) which tends to dry the skin, a cream base can be a better choice e.g. Ombrella 15 or Photoplex). Retisol-A is particularly good because it combines a broad-base sunscreen with tretinoin and a moisturizer in a single cream.

• If you participate in sports or swim, sunscreen that will not wash off immediately are recommended (Ombrella 15 or Presum 29 are useful)

• Thus , the need of sunscreen varies with the skin type, your daily activities, geographical locations and climatic condition. As UV rays are reflected from sand, sun, water, snow and ice. The frequency of application of a sunscreen, too will vary with your activities. If you work out-of doors, whether in winter or summer, several applications of high SPF sunscreens throughout the day will be required.

How To Apply A Sunscreen

The key to an effective use of sunscreen is to:

• Be diligent about their application.

• Apply them regularly and in adequate amounts. Thinly applied sunscreens markedly decrease the sun protection factor. 

• Apply sunscreen on your children regularly as well, to the exposed areas of their body.

• Cleanse the skin, before application (sunscreen).

• Apply sunscreen (min 15 SPF) to areas of body which will be exposed to the sun.

• Apply moisturizer if necessary.

• Apply make up.

• Reapply the sunscreen if needed throughout the day depending on the amount of sun exposure and your rate of perspiration.

Sunscreen are most effective when they are applied to cool, dry skin, so they should be put on 20-30 minutes before sun exposure. The reason being:-

1. The sunscreen needs a cool dry surface to bind to the top layer of the skin.

2. There is a possibility that you might get a heat or sweat rash from the sunscreen if applied when the skin is hot because the sweet pores are open.

How To Be Safe In The Sun

• Apply a broad spectrum sunscreen with an SPF of 15, such as Ombrelle 15, daily to sun exposed areas of the skin.

• Apply the sunscreen about 30 minutes before sun exposure when the body is cool and dry so it will bind better to the skin.

• Reapply sunscreen throughout the day according to the amount of sun exposure you receive. If you are participating in sports which make you perspire, reapply sunscreen every hour.

• Protect the sun exposed areas of the body all year round.

• Apply adequate amounts of sunscreen, one ounce for one body for one application. If you are using adequate amounts of sunscreen, you should be purchasing it as regularly as you purchase toothpaste. High-risk areas for cancer such as the face and hands should receive an extra dose of sunscreen. If you don't mind the look of a total block, use zinc oxide or titanium dioxide on the particularly sensitive areas such as the nose and cheek bones.

• Be thorough in your application: sun exposed skin which is not covered will burn.

• If you are wearing loosely woven clothing, put sunscreens on underneath them. The sun also penetrates wet clothing easily.

• Wear waterproof or water-resistant sunscreens if you plan to be in the water. Waterproof sunscreens last for 1 1/2 hour and water resistant sunscreens for about 30 to 40 minutes. They should be re-applied to dry skin allowing a bonding period of 20 minutes before re-entering the water.

• Wear 100% UV-protected sunglasses that wrap around the eyes. Darker sunglasses do not necessarily filter out the UV rays unless they are specially coated.