TESTIMONIALS

I have been having knee pain and ITband pain for the past month on all my runs. Dr. Thiry explained that my pelvis was rotated causing my gait to be off leading to extra stress on the lateral side of my right leg. With adjustments to correct the rotation in my pelvis and the Graston soft tissue technique for my ITband, I am running again and pain free.

Thanks Dr. Thiry

-- Lisa M.

 

The pain was shooting down both of my arms and I was afraid to move. Dr. Thiry came in after hours to see me. I was able to sleep the first night after treatment. He helped fix the problem in a short time.

Thanks for all you do Dr. T.

--Pam H.

Personal Care Chiropractic Clinic: Articles

TO SUNSCREEN OR NOT TO SUNSCREEN

By Dr. Robert Thiry DC, EMT

      Many questions are arising about sun exposure, increased skin cancer and the use of sunscreen. Should we use sunscreen or should we avoid it? Is sun exposure actually good for me? In this article I will share the research on the subject and you can determine the best protection.

The main type of radiation given off by the sun associated with skin cancer is Ultraviolet Radiation.
It is broken down into three types:

Ultraviolet C (UVC) The most harmful of the three types, but almost completely absorbed by the ozone layer.

Ultraviolet B (UVB) Also absorbed by the ozone layer, but still able to pass through to the earth surface. UVB affects the outer most layers of the skin and may cause  1. Sunburn  2. cataracts  3 .immune suppression and  4. genetic damage that may lead to skin cancer. UVB also stimulates the production of vitamin D by the body.

Ultraviolet A (UVA) This type of radiation passes through the ozone layer and reaches the earth’s surface. It penetrates deeper into the skin can cause skin aging, damage to DNA and leads to free radicals and reactive oxygen species that damage cells and lead to skin cancer.

    According to the current research all three types of radiation are harmful and may lead to skin damage or even cancer. However, there is some research which shows certain amounts of sun exposure actually reduce the risk of sun cancer.

    Vitamin D3 ( Cholecalciferol ) is a steroid that is produced when the skin is exposed to the UVB rays of the sun. Research suggests that Vitamin D3 is not only important in the repair of damaged tissue but may also be a potent cancer fighter (It may accomplish this by prevention and replication of these types of cells). A 2011 research article by Dianne E. Godar, a chemist with the Food and Drug Administration
Even suggests that indoor workers are as or more likely to develop melanoma than outdoor workers. The two main reasons 1) minimal sun exposure during the week and high concentrations of sunlight on weekends and holidays leading to an increased risk of sunburn 2) working indoors where windows filter out the UVB rays which promote Vitamin D3 synthesis and allow all of the harmful UVA rays in for exposure.

      The need for Vitamin D to promote healthy bones and tissues as well as the potential cancer fighting benefits exists, so the question arises why the increase in skin cancer cases over the past 25 years.
Is it that the ozone layer has deteriorated and more harmful rays are reaching the earths’ surface? There are many articles that all seem to have different opinions. One article will say we are doomed, the next will say the ozone layer is regenerating and another says the whole thing is untrue all together. An article in the British Journal of Dermatology:  suggest the increase in cases of skin cancer is related to a new way of reporting not an increase in exposure. The new way of reporting includes benign lesions as stage 1 melanoma. As a result lesions that in the past were not reported as cancer now are.

     It gets to be a little confusing.  Is sun is bad or good? Should I be indoors or outdoors? Is the ozone layer gone or is it just fine? In the end it appears the general consensus is that a certain amount of sun is actually good and healthy, but over exposure may lead to abnormal skin aging and possible skin cancer. The highest risk for skin cancer appears to come when the skin gets burned. An article from the Skin Cancer Foundation: says that a child who gets sunburned has double the risk of skin cancer as they get older and that anyone who has burned five or more times also has a doubled risk of melanoma.

     Though some sun is good,  protection from it is also very important. The easiest form of protection is cover with the right clothing. Tight woven materials such as polyester will block the sun. Colored clothing may also absorb the radiation before it reaches the skin. Some clothing is designed to protect from the sun but be sure to take a look at what chemicals are used to accomplish this goal. More often than not they are optical brighteners (also in some laundry detergents) which include stilbenes or umbelliferone. These chemicals absorb the UV rays but the EPA indicates that these chemicals are potentially toxic and may lead to developmental or reproductive issues.

    The next most popular form of protection is sunscreen. Sunscreen works by filtering out some of the rays so they can’t penetrate the skin. Sunscreens have SPF ratings which indicate how well they block UVB rays that cause sun burn. SPF 30 blocks 97% of the UVB rays and SPF 45 blocks 98%. The problem is that they don’t necessarily block the UVA rays which are also dangerous. The other problem is that the chemicals used to absorb these rays, may be just as harmful as the rays themselves. Studies show that many of these chemicals, when absorbed into the skin, can disrupt hormone production and function, stimulate estrogen dependent tumors cells, as well as behavioral and developmental issues.

     In an experiment by Hanson et al. published in 2006, the amount of harmful reactive oxygen species (ROS which in high amounts leads to tissue destruction), was measured in untreated and in sunscreen treated skin. In the first 20 minutes, the film of sunscreen had a protective effect and the amount of ROS was smaller. However, after 60 minutes the amount of absorbed sunscreen was so elevated that the amount of ROS was higher in the sunscreen treated skin than in the untreated skin.

     Sun block is another option. Most sun blocks contain the minerals zinc oxide or titanium dioxide and will deflect the bad rays (UVB and UVA) away from the skin. The biggest negative with most sun blocks is that they are thick and often leave a white film on the skin. Some sun blocks grind the minerals smaller into what are called nano-particles. However, nano-particles can be absorbed by the skin and into the blood stream creating some health concerns. Some companies such as Badger, Burts Bees, and Coola have sun blocks that are non nano-particles and have less whitening, which appears to be a safe option.

     In the end, it appears that moderate amounts of sun are beneficial and actually healthy and avoiding sun burn is most important. The best protection is proper clothing or non nano-particle sun block. If using a sunscreen or sun block is your protection of choice it should be applied 15-20 minutes before sun exposure and should be reapplied every 2 hours.

 

References:
The Skin Cancer Foundation
British Journal of Dermatology
Food and Drug administration
National Cancer Institute
Foodbabe.com
WebMD
Health news
American Cancer Fund

 

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