I’m by no means an expert in the field, so short answer is I don’t know. It’s probably connected with muscle protein synthesis which in trained people peak in

I’m by no means an expert in the field, so short answer is I don’t know. It’s probably connected with muscle protein synthesis which in trained people peak in 24 hours and basically goes back to basal level after 72 hours [1] After that, without exercise, all gained muscle growth starts to negate. [1] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1474228/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1474228/