Health knowledge made personal
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I believe that the biggest reason that distance runners gain weight as they age is because of a decrease in HGH levels. I agree with your thoughts that sprint training is an effective to help keep the weight off for life-long distance runners. Here is a link to an article I wrote about why distance runners gain weight as they age:
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Here's some research on how running relates to aging and weight gain. The research shows that even in those runners doing high mileages, (50+ miles per week), there is still an increase in weight and waistline over time.
Strangely, the author of this study recommends that people must do more running to stave off this weight gain. The author states that running distance must increase annually by 1.4 miles per week to stop weight gain.
Instead of just running more and more miles, there are better methods to halt age-related weight gain. I've posted before about masters sprinters, and how they are remarkably lean throughout the life cycle. To me, this seems like a much better route than logging hundreds of miles.