Studies related to Muscle Mass and Vitamin D

Effects Of Vitamin D3 Supplementation For 12 Weeks On Serum Levels Of Anabolic Hormones, Anaerobic Power, And Aerobic Performance In Active Male Subjects: A Randomized, Double-blind, Placebo-controlled Trial

Effect None
Values kg. Mean and SD. Placebo: before 51.51 (3.91), after 51.77 (4.03). Vitamin D: before 53.73 (6.62), after 53.94 (6.20).
Trial Design Randomized trial
Trial Length 1-6 months
Number of Subjects 46
Sex Male
Body Types Trained
Notes for this study:
In a randomized, double-blind, placebo-controlled trial, 46 male participants took 2000 IU of vitamin D per day or placebo for 12 weeks during the fall and winter seasons.

There was a greater reduction in fatigue during exercise and PTH, and a greater increase in testosterone and VO2max for participants who took vitamin D, and participants who had vitamin D deficiency saw greater reductions in cortisol, though not participants who did not. There was not a statistically significant difference for peak power, average power, growth hormone, IGF-1, testosterone to cortisol ratio, BMI, waist circumference, body fat mass, lean body mass, muscle mass, physical activity, or sun exposure-related behaviors.

Baseline vitamin D levels were 57.21 (22.88 SD) nmol/L in the vitamin D group and 55 (18.70). After 12 weeks, these numbers were 61.61 (20.15) and 44.86).

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