Once-weekly dose of 8400 IU vitamin D(3) compared with placebo: effects on neuromuscular function and tolerability in older adults with vitamin D insufficiency

The American Journal of Clinical Nutrition
Paul LipsDimitris A Papanicolaou

Abstract

Vitamin D insufficiency, which is prevalent in older individuals, is associated with bone and muscle weakness and falls. We examined the effects of a weekly dose of 8400 IU vitamin D(3) on postural stability, muscle strength, and safety. In this double-blind trial, subjects aged > or =70 y with serum 25-hydroxyvitamin D [25(OH)D] concentrations < or =20 but > or =6 ng/mL were randomly assigned to receive a weekly dose of 8400 IU vitamin D(3) (n = 114) or a placebo (n = 112). Mediolateral body sway with eyes open (assessed with the AccuSway(PLUS) platform; Advanced Medical Technology Inc, Watertown, MA) was the primary endpoint. Secondary endpoints included the short physical performance battery (SPPB) and serum 25(OH)D concentrations. An analysis of covariance model was used for treatment comparisons. Safety and tolerability were monitored. Serum 25(OH)D concentrations rose significantly (from 13.9 to 26.2 ng/mL, P < 0.001) in patients treated with 8400 IU vitamin D(3) but not in patients treated with the placebo. After 16 wk, neither mediolateral sway nor SPPB differed significantly between treatment groups. However, in the post hoc analysis of patients subgrouped by baseline sway (> or = 0.46 compared with <0.46 cm), treatmen...Continue Reading

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