Research has shown it takes 48 hours to repair stress-related damage. With rest, each overstressed cell is programmed to rebuild stronger when it is broken down, so it can handle a greater load next time. Cell walls become stronger as the membrane rebuilds a bit thicker. The mitochondria increase in size and number so they can process more energy. Vessels and arteries repair and strengthen, and over several months more capillaries are produced to better deliver nutrients and withdraw wastes
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