Increased sun exposure during summer holidays in adolescence was associated with reduced eczema and rhinitis risk, according to a recent study published in Pediatric Allergy and Immunology. The finding was independent of measured vitamin D levels and showed no difference in inhalant allergen sensitization or asthma. The beneficial effects of sun exposure on allergic disease may operate independently from vitamin D or an effect on allergen sensitization, the researchers note.
The study examined whether reported sun exposure during childhood or in adolescence is related to the occurrence of atopy or allergic disease. The population-based longitudinal cohort study included a 16-year follow-up (n=415). Subjects were recruited at birth as part of an infant health study. Daily duration of sun exposure in the summer months was recorded at 8 and 16 years of age. Allergen sensitization and the presence of eczema, asthma and rye grass positive rhinitis were recorded at age 16.
Reported sun exposures of more than 4 hours per day during summer holidays in adolescence were associated with reduced eczema and rhinitis but not inhalant allergen sensitization or asthma risk. Higher sun exposure during summer holidays and summer weekends in adolescence was associated with significantly reduced eczema (test of trend P =0.001 summer holidays; test of trend P=0.003 summer weekends) and rye grass positive rhinitis (test of trend p-value = 0.03 summer holidays; test of trend p-value = 0.02 summer weekends). Sun exposure at adolescence or age 8 was not related to inhalant allergen sensitization. There was no association between serum 25(OH)D levels at adolescence with either inhalant allergen sensitization or allergic disease and adjustment for serum 25(OH)D levels did not alter these findings.
Kemp AS, Ponsonby AL, Pezic A, et al. The influence of sun exposure in childhood and adolescence on atopic disease at adolescence. Pediatr Allergy Immunol. 2013;24(5):493-500.
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