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3.1.4 Other benefits of sunlight Below are a number of research studies stating possible benefits from sunlight exposure in moderate amounts. 3.1.4.1 Cholesterol According to document published by the World Health Organisation, studies show UV radiation exposure reduces serum cholesterol. This may influence general cholesterol levels within the body (W.H.O., 1976). 3.1.4.2 Blood Pressure A number of clinical and epidemiological studies have suggested that there is a correlation between Vitamin D-deficiency and high blood pressure. Recent studies demonstrate that Vitamin D is a potent endocrine suppressor of renin, which regulates the renin-angiotensin system (RAS). RAS plays a central role in the regulation of blood pressure, volume and electrolyte homeostasis. Inappropriate activation of the RAS can lead to high blood pressure. Mice, deficient in Vitamin D, displayed increased levels of renin and angiotensin which lead to hypertension, cardiac hypertrophy and increased water intake. Therefore the production of Vitamin D from UV radiation exposure or Vitamin D supplementation would then act to suppress renin thereby reducing blood pressure (Xiang et al, 2004). In another study, blood pressure was found to drop for several days upon exposure to UV radiation (W.H.O., 1979). Rostand (1997) found in his study ‘Ultraviolet Light May Contribute to Geographic and Racial Blood Pressure Differences’, that there is a linear rise in blood pressure at increasing distances from the equator. Similarly, blood pressure is higher in winter than summer. Blood pressure can also be affected by variations in skin pigmentation. Altered calcium, vitamin D, and parathyroid hormone levels are also associated with hypertension and may vary with latitude and season. Since changes in UV light affect vitamin D and parathyroid hormone status and UV light intensity are influenced by seasonal change and latitude, Rostland concluded that there must be an association between blood pressure and ultraviolet light (Rostland, 1997). Research published in the American Journal of Physiology (1935) shows that UV radiation (UVB not UVA) reduces blood pressure in 60 - 70 percent of hypertensive people involved in 25PDF Image | THE USE OF LIGHT AND COLOUR AS A HEALING MODALITY
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