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Editor's Correspondence
September 28, 2009

Relationship Between Bone, Fracture, and Exercise: The Key Role of Vitamin D—Reply

Arch Intern Med. 2009;169(17):1633-1638. doi:10.1001/archinternmed.2009.323

In reply

Annweiler and Beauchet suggest that the 20% nonvertebral fracture reduction with vitamin D supplementation at a dose greater than 400 IU/d may in part be explained by a direct benefit of vitamin D on muscle, resulting in fewer falls and thereby fewer fractures. The comment by Annweiler and Beauchet is supported by the presence of the vitamin D receptor in human muscle tissue1 and a rapid2,3 and sustained47 effect of vitamin D supplementation on falls from several trials. Thus, we agree—although falls were not assessed in our meta-analysis,8 supplementation likely resulted in reduced falls contributing to the observed fracture risk reduction.

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