Abstract
Decreased serum concentrations of 25-hydroxyvitamin D (25(OH)D) affect people with chronic kidney disease (CKD); lower concentrations of 25(OH)D have been associated with decrease in nutritional status indicators. On the other hand, muscle resistance exercise has improved the nutritional status of patients with CKD.The aim of this study was to evaluate the effect of resistance exercise and dietary supplementation with cholecalciferol on nutritional status indicators in adults with stage 4 CKD. Patients with an estimated glomerular filtration rate between 15 and 29mL/min/1.73m2 in an open-label clinical trial were followed for 12weeks. The intervention group received exercise resistance training sessions three times per week with oral cholecalciferol supplementation each day. The control group only received standard medical care. The outcomes were anthropometric measurements, handgrip strength, and bioelectrical impedance analysis. Thirty-nine patients of a median age of 48 (36-52) years had an estimated glomerular filtration rate of 21.8±6.5mL/min/1.73m2. A total of 57.5% of the patients were women. In 41% of the patients, the etiology of CKD was diabetes. After 12weeks, in the intervention group, the adherence to the resistance training was 77%, and the adherence to the supplementation with cholecalciferol was 96.2%. Significant improvements in 25(OH)D serum concentrations and in handgrip strength were detected in the intervention group (P<.05). In the control group, a decrease in 25(OH)D serum concentrations and a loss in handgrip strength were observed, although the difference was not statistically significant. Anthropometrics and biochemical and dietary indicators, but not bioelectrical impedance data, exhibited changes. Supplementation with cholecalciferol improves serum concentrations of 25(OH)D and, when combined with resistance exercise, improved muscle function as measured by handgrip strength in a study of patients with CKD not on dialysis.
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