The present review demonstrates that vitamin D supplementation result ed in small but nonsignificant improvements in muscle strength compared to control in postmenopausal women .
No significant effect was observed in mobility after vitamin D administration
BACKGROUND The results obtained from previous trials regarding the effects of vitamin D supplementation on muscle strength and mobility  in postmenopausal women have been inconsistent .
This systematic review and meta- analysis of r and omised controlled trials ( RCTs ) aim ed to investigate the effect of vitamin D supplementation on muscle strength and mobility in postmenopausal women .
Calcifediol versus vitamin D3 effects on gait speed and trunk sway in young postmenopausal women: a double-blind randomized controlled trial
Summary In this double-blind RCT , 4-month treatment with calcifediol compared with vitamin D3  improved gait speed by 18 % among young postmenopausal women . Consistently , change in 25(OH)D blood levels over time were significantly correlated with improvement in gait speed in these women . No effect could be demonstrated for trunk sway . Introduction The aim of this study is to test the effect of calcifediol compared with vitamin D3 on gait speed and trunk sway . Methods Twenty healthy postmenopausal women with an average 25(OH)D level of 13.2 ng/ml ( SD = ±3.9 ) and a mean age of 61.5 years ( SD = ±7.2 ) were r and omized to either 20 μg of calcifediol or 20 μg ( 800 IU ) of vitamin D3 per day in a double-blind manner . At baseline and at 4 months of follow-up , the same physiotherapist blinded to treatment allocation tested 8-m gait speed and a body sway test battery ( Sway star pitch and roll angle plus velocity while walking 8 m , and st and ing on both legs on a hard and soft surface ) . All analyses adjusted for baseline measurement , age , and body mass index . Results Mean 25(OH)D levels increased to 69.3 ng/ml ( SD = ±9.5 ) in the calcifediol group and to 30.5 ng/ml ( SD = ±5.0 ) in the vitamin D3 group ( p < 0.0001 ) .  Women receiving calcifediol compared with vitamin D3 had an 18 % greater improvement in gait speed at 4-month follow-up ( p = 0.046 ) adjusting for baseline gait speed , age , and body mass index . Also , change in gait speed was significantly correlated with change in serum 25(OH)D concentrations ( r = 0.5 ; p = 0.04 ) . Across three tests of trunk sway , there were no consistent differences between groups and no significant correlation between change in 25(OH)D serum concentrations and change in trunk sway  . Conclusions Calcifediol  improved gait speed in early postmenopausal women  compared with vitamin D3 and change in 25(OH)D level was moderately correlated with improvement in gait speed . A benefit on trunk sway could not be demonstrated
The present review demonstrates that vitamin D supplementation result ed in small but nonsignificant improvements in muscle strength compared to control in postmenopausal women .
No significant effect was observed in mobility after vitamin D administration
BACKGROUND The results obtained from previous trials regarding the effects of vitamin D supplementation on muscle strength and mobility  in postmenopausal women have been inconsistent .
This systematic review and meta- analysis of r and omised controlled trials ( RCTs ) aim ed to investigate the effect of vitamin D supplementation on muscle strength and mobility in postmenopausal women .