Recent studies have linked low vitamin D levels with decreased athletic performance. German literature showed increased athletic performance with UV light as far back as the 1950’s. Vitamin D is made in by your body when the skin is exposed to UV light. A recent study of patients presenting with fractures to a pacific northwest hospital showed that 71% of people in the winter and 62% in the summer were vitamin D insufficient or deficient.
Bottom Line: The majority of people in the Pacific Northwest are Vitamin D deficient and this affects your athletic performance. Make sure you take Vitamin D supplementation. The institute of medicine recommends 600 IU of Vitamin D a day for people between the ages of 1 and 70 and 800 IU a day for those over 70.