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 .
Stronger back muscles reduce the incidence of vertebral fractures: a prospective 10 year follow-up of postmenopausal women.
The long-term protective effect of stronger back muscles on the spine was determined in 50 healthy white postmenopausal women , aged 58 - 75 years , 8 years after they had completed a 2 year r and omized , controlled trial . Twenty-seven subjects had performed progressive , resistive back-strengthening exercises for 2 years and 23 had served as controls .  Bone mineral density , spine radiographs , back extensor strength , biochemical marker values , and level of physical activity were obtained for all subjects at baseline , 2 years , and 10 years . Mean back extensor strength ( BES ) in the back-exercise ( BE ) group was 39.4 kg at baseline , 66.8 kg at 2 years ( after 2 years of prescribed exercises ) , and 32.9 kg at 10 years ( 8 years after cessation of the prescribed exercises ) . Mean BES in the control ( C ) group was 36.9 kg at baseline , 49.0 kg at 2 years , and 26.9 kg at 10 years . The difference between the two groups was still statistically significant at 10 year follow-up ( p = 0.001 ) . The difference in bone mineral density , which was not significant between the two groups at baseline and 2 year follow-up , was significant at 10 year follow-up ( p = 0.0004 ) . The incidence of vertebral compression fracture was 14 fractures in 322 vertebral bodies examined ( 4.3 % ) in the C group and 6 fractures in 378 vertebral bodies examined ( 1.6 % ) in the BE group ( chi-square test , p = 0.0290 ) . The relative risk for compression fracture was 2.7 times greater in the C group than in the BE group . To our knowledge , this is the first study reported in the literature demonstrating the long-term effect of strong back muscles on the reduction of vertebral fractures in estrogen-deficient women
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 .