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Higher vitamin D levels associated with better cardiorespiratory fitness

Earlier vitamin D studies measuring heart and lung fitness have been inconsistent.

In this large, nationally representative sample, doctors measured vitamin D levels in 1,995 people, aged 20 to 49, and compared it to their heart and lung fitness. Researchers used a test of maximum oxygen consumption capacity as the gauge of cardiorespiratory (CR) fitness. Overall, those with the highest levels of vitamin D had 4.3 times the CR fitness as those with the lowest levels.

Doctors then adjusted for age, gender, race, body-mass index scores, smoking, high blood pressure, and diabetes, and still found a 2.9-times increase in maximum oxygen consumption compared to those with the lowest vitamin D levels. As levels of vitamin D increased, oxygen consumption capacity also increased.

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