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Muscles not improved by just Vitamin D weekly (also need exercise) – Dec 2019

Four months vitamin D supplementation to vitamin D insufficient individuals does not improve muscular strength: A randomized controlled trial.

PLoS One. 2019 Dec 16;14(12):e0225600. doi: 10.1371/journal.pone.0225600. eCollection 2019.
Grimnes G1,2, Kubiak J1,2, Jorde R1,2.

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The inconsistent results on the effects of vitamin D on muscle strength reported by intervention trials may partly be explained by inclusion of vitamin D sufficient individuals. The main objective was to study whether vitamin D supplementation will improve muscle strength in men and women with low serum vitamin D status, as measured by 25-hydroxyvitamin D (25(OH)D) at baseline.

417 men and women aged 40-80 years were included and randomized to receive a loading dose of 100 000 IU (2500 ug) vitamin D3 followed by 20 000 IU (500 ug)/week, or placebo. Muscle strength was tested by dynamometers at baseline and after four months.

Serum 25(OH)D levels increased from 32.6±11.1 nmol/l to 88.8±19.4 nmol/l (p<0.01) in the vitamin D group, while remaining low in the placebo group (baseline and final levels at 35.1±13.6 nmol/l and 30.7 ±9.7 nmol/l respectively). Muscle strength (hip flexion, biceps flexion, pectorals and handgrip strength) did not change in any of the groups. The results were the same in analyses stratified on sex, 25(OH)D above/below 25 nmol/L (10 ng/ml); smoking status; and BMI above/below 27 kg/m2.

These data does not support vitamin D supplementation for improving muscle strength.

Created by admin. Last Modification: Tuesday December 17, 2019 11:56:51 GMT-0000 by admin. (Version 2)

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