Blood testing on active Pittsburgh Steelers players revealed that almost 70% of the roster had inadequate vitamin D levels (<32ng/mL), despite living and playing outdoors for much of the season. When controlling for number of professional years played, vitamin D levels were significantly lower in players with at least 1 bone fracture when compared with no fractures. Players who were released during the preseason because of either injury or poor performance had significantly lower vitamin D levels than did players who played in the regular season.
Performance & Recovery
Vitamin D Profile in National Football League Players
The American Journal of Sports Medicine
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