For me, it seems like about three days. Here's a more scientific look. It's a short article, only 11 paragraphs if you hit the link.
“Studies have shown that cardio fitness tends to go away quicker than fitness built by strength training,” says McCall. In other words, that Spinning class is going to feel tougher than lifting weights.
And lastly, other factors come into play when your muscle definition dwindles. Things like genetics, age—we lose three to five percent of muscle mass per decade after we turn 30, says McCall—stress levels, sleep, and metabolism all have a role in how quickly you’ll lose that strength.
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