this post was submitted on 05 Oct 2023
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There's another element to this. Muscle tissue is metabolically expensive, so it's beneficial for an organism to limit muscle mass to only as much as it needs to succeed, thus reducing how much food is necessary. There's actually a protein, myostatin, that directly works to inhibit muscle growth. Some specific breeds of cow lack this; search up Belgian Blue cattle for a look.
Yes. The key difference is the near 100% exertion. If the muscles are used to they're maximum on a regular basis, the body will consider them necessary for survival.
If you suddenly dropped the weight by 20%, so that you exert those muscles less, you would expect them to gradually weaken by a similar margin over time; eventually, to the point that lifting the 80% weight would require near 100% exertion.