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As for respiratory function tests, FEV1 and respiratory flow were also studied. For physical fitness tests, the "six-minute walk test" (6MWT) was used. Results After vitamin D supplementation, we observed that serum creatine kinase levels returned to optimal values. This change suggests a protective role of vitamin D against muscle catabolism compared to placebo. In terms of physical test results, we observed only slight non-significant improvements, although patients reported feeling better. Conclusions Vitamin D supplementation produc