The Relationship of Lean Body Mass with Vitamin D Level and Physical Performance

Objective: In this study, it was aimed to investigate the association between vitamin D level, physical performance and lean body mass (LBM). Materials and Methods: A hundred female patients with 35-50 age range were included in the study. Patients’ demographic variables, height and weight measurements were recorded and body mass index (BMI) was calculated. Serum 25-hydroxyvitamin D (25(OH)D) samples were analyzed. Patients were divided into 2 groups according to 25(OH)D levels; patients with low vitamin D levels (group 1) and normal vitamin D levels (group 2). Both groups’ LBM was assessed by dual-energy X-ray absorptiometry and physical performance was assessed by 6-Minute Walk Test (6MWT). Results: Mean levels of 25(OH)D were found as 14.026±7.10 ng/mL in group 1 and 43.40±10.03 ng/mL in group 2. When the results of LBM were evaluated, the mean of group 1 was 35.48 (26.33-47.17) kg and the group 2 was 35.14 (29.23-53.65), and there was no statistically significant difference between the groups with regard to the mean of LBM (p=0.679). No statistically significant difference was determined in terms of 6-MWT (p=0.992). According to serum 25(OH)D level, group 1 was divided into three subgroups as follow; Group 1a: 25(OH)D