Cardio is more harder in winter, New Study confirms

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Doing cardio during winter can feel tough for various reasons. 

According to new research published in the European Journal of Preventive Cardiology there’s a link between higher vitamin D levels and improved cardiovascular fitness.

As we well know, the main source of vitamin D is sunlight. But in winter, our exposure to the big guy in the sky and his relative benefits decreases. The end result could be affecting our athletic performance.

 In order to reach their conclusions, the scientific researchers behind this study assessed the health data of 1,995 people between the ages of 20 and 49 years, making sure not to include those whose vitamin D levels were at the top and bottom 5% extremes. The information was gathered from the US National Health and Nutrition Survey (2001–2004), and they noted participants' oxygen consumption levels (as a marker of cardiorespiratory fitness) alongside vitamin D levels. 

What the researchers found was that participants in the highest quartile of vitamin D levels had a significantly higher cardiorespiratory fitness than participants in the lowest quartile. The findings, the report states, are "robust", but would now need to be validated with clinical trials to confirm the direct link. 

Still, if you’re finding it hard to get up and exercise in the morning now that it’s dark, it won’t hurt to try and up your vitamin D levels. Try eating fatty fish like mackeral or salmon, as well as cheese and egg yolks. Or escaping somewhere hot for a winter break.

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