Exercise benefits aren't the same for old and young

Power-boosting Signal In Muscle Declines With Age ScienceDaily 2/7/07 "As people age, they may have to exercise even harder to get the benefits afforded to younger folk...AMP-activated protein kinase (AMPK) slows down in the skeletal muscle of 2-year-old rats relative to 3-month-old rats. A chief regulator of whole-body energy balance, AMPK in skeletal muscle stimulates the oxidation of fatty acids and the production, or biogenesis, of power-producing mitochondria that burn fat and fuel cells, according to the researchers...Earlier studies have shown that, in comparison to 20-year-old adults, even lean and healthy people in their seventies show a higher incidence of fat buildup in their muscle and livers and a deficiency in mitochondrial function..."So, one probably has to work harder to maintain the same level of fat oxidation and mitochondrial biogenesis in muscle.""

So if you see a lean muscular 70yr old person, they might be working out all the time to look like that. Also might explain why it does seem harder to lose weight as one gets older... because it is harder. Does that make you feel better? Didn't think so.

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