A study on female navy recruits by faculty at Creighton University for an eight week training period women, ages 17 to 35, were divided into two groups with one group receiving daily pill supplements of 2,000 Mg of calcium and 800 IU of vitamin D, and the other group receiving placebo pills. The recruits in the placebo group experienced stress fractures, about 25 percent more than in the group taking the calcium/vitamin D supplements. A history of regular exercising decreased the risk of stress fractures, while cigarette smoking increased the risk.
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