Posts Tagged ‘UV radiation’

Athletes are at risk for skin cancer.

Wednesday, September 4th, 2019

At a recent conference of the Physiological Society’s Extreme Environmental Psychology a researcher said athletes ranging from hikers, to tenn is to runnersexceed the recommended ultraviolet exposure limit by up to eight-fold during the summer and fall seasons. Even though exercise is assocoated with a reduced risk of cancer, skin cancer is the exception. For malignant skin cancers, those in the 90th percentile of exercise have an increased risk of cancer than those in the 10th percentile. And outdoor activities have consistently demonstrated an elevated risk for skin cancer in research studies.

Ultraviolet radiation is categorized byy wavelengths as UV- (320-400 nm) that is about 95% of radiation reaching the earth; UV-B (290-320 nm) whichis about 5% of the radiation reaching earth; and UV-C (200-290 nm). In the skin, the skins blood circulation can be reached by UV-A, whereas most of the UV-B is absorbed by the outer layer of the skin due to its short wavelength.

Responses to untraviolet rays are also affected by skin pigmentation. The bodys ability to create two important substances¬† are affected by ultraviolet radiation. These are vitamin D and folate whih are especially important in pregnancy and early childhood development and UV radiation helps vitamin D synthesis and causes folate to break away. Some believe early human populations living in Africa, evolved skin pigmentation to protect themselves from folate degradation and as later populations moved away from the equator skin depigmentation allowed for higher levels of vitamin D synthesis. The researcher concluded with “Sun protection in athletes is especially important as multiple studies demonstrate an elevated risk of skin cancer for those who regularly participate in outdoor sports or exercise. Suprisingly, fewer than 25% of surveyed athletes reported regular use of sunscreen,m so there is clearly more awarenewss-raising that needs to be done.”

Skin Cancer Risk and Vitamin D Levels

Friday, August 26th, 2011


A new study reported online in the Archives of Dermatology concluded that as individual’s vitamin D level increases their risk for nonmelanoma skin cancer (NMSC) also seems to increase but factors such as untraviolet (UV) radiation exposure may complicate this relationship. The study was carried out among 3,223 white subjects in a health maintenance organization (HMO) with a high probability of developing NMSC, Between January 1997 and December 2001, subjects were assessed for levels of serum 25-hydroxyvitamin D (an indication of vitamin D levels), and parathyroid hormones, creatinine and calcium levels. Over 2/3 of the participants (n=2,257) seemed to have insufficient levels of vitamin D and the diagnoses of NMSC were made in 240 individuals including 49 with squamous cell carcinoma (SCC), 163 individuals with basal cell carcinoma (BCC) and 28 individuals with both (all forms of NMSC). Individuals who were not deficient in vitamin D seemed to have an increase risk of developing NMSC and although this relationship was positive it was not statistically significant for tumors developing on body parts routinely exposed to UV radiation suh as arms and legs. More research is needed in this area of study.