Most of us begin to lose muscle mass within two to three weeks of stopping strength training. At the same time, some scientific studies show that people lose muscle after one week, while others show that they lose muscle after three weeks of not exercising. Older adults can lose muscle especially quickly, according to a study published in the Journal of the American Medical Directors Association.
How long a person trains plays a determining role in this process. If he does this for years, his body will be better prepared for class breaks. However, beginners and people with minimal strength training experience may notice faster muscle loss.
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Source: Ferra

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