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Long-Distance Running: Avoid This Popular Exercise As It Shrinks Your Muscle and Accelerates Aging

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  • Dr. McGuff is a proponent of high-intensity interval training using weights, which is purposed to achieve many of the same results as Sprint 8 exercises using cardio equipment
  • High-intensity exercise, which engage your fast-twitch muscle fibers, is required if you want an effective aerobic workout, and can cut your workout time from an hour on the treadmill down to 12-15 minutes
  • Your fast-twitch fibers are largely glycolytic and store a lot of glucose. When these muscles are recruited, it creates the stimulus needed to grow muscle. At the same time, it enlarges the glucose storage reservoir in the muscle, which enhances your insulin sensitivity
  • Long, slow, distance-type of exercise can actually cause your intermediate and fast-twitch fibers to begin to atrophy. Aside from losing muscle mass, this also promotes onset of loss of insulin sensitivity

By Dr. Mercola

Dr. Doug McGuff, M.D., an emergency room physician, is also an expert in one of my new passions of exercise, namely high-intensity interval training. One of the primary reasons that drove me into medicine was to apply my interest in exercise to optimize health.


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