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Strength and Power Decline Faster With Age Than Muscle Size
aging basic-science healthcare
Muscle size shrinks about 1% a year after 40, but that's not the number that decides whether you can catch yourself before you hit the floor. Strength falls 2 to 4% a year and power, the ability to move fast and forcefully, drops as much as 8 to 10% a year, and power is what keeps a stumble from becoming a broken hip. Exercise scientist Andy Galpin's point is blunt: cardio doesn't touch that neuromuscular decline, heavy resistance training does. And if you haven't started, his data on adults over 90 gaining 30 to 170% in strength and size over roughly 12 weeks suggests the window is still open.
Full analysis
Exercise scientist Andy Galpin explains that after about age 40, people lose roughly 1% of muscle size per year — but lose 2 to 4% of strength per year and as much as 8 to 10% of muscle power per year. Power (the ability to move quickly and forcefully) is more closely tied to functional independence — standing up, catching yourself from a fall, moving confidently — than muscle size alone. Galpin argues that heavy resistance training is the only form of exercise that combats this neuromuscular decline; no amount of cardio substitutes for it.
The encouraging news: it is never too late to start. Galpin cited a study of adults over age 90 who saw improvements of 30 to 170% in muscle size and strength over roughly 12 weeks of resistance training. For anyone at 50 who has not yet started, he says you can reach a strong functional baseline relatively quickly.
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