Hormonal
Females exhibit greater susceptibility to disuse-induced muscle atrophy compared to males, evidenced by faster onset of muscle loss and greater percent loss of oxidative (Type I) muscle mass during conditions like hindlimb unloading or ICU bed rest.
If you are female, be aware that your muscles may waste away faster than a male's during periods of inactivity (like bed rest or casting). This is partly because you naturally have more 'slow-twitch' muscle fibers, which are more vulnerable to disuse. Prioritize early, gentle movement or specific resistance strategies sooner than you might expect, as your body is biologically predisposed to lose this muscle type faster.
In general, females appear to be more susceptible to disuse induced muscle wasting, yet protected from inflammation induced (such as cancer cachexia) muscle wasting compared to males.
Why this rating
Based on a comprehensive review of multiple animal and human studies showing consistent trends in fiber type susceptibility and satellite cell response.
Source
Muscle metabolism and atrophy: let’s talk about sex
Megan E. Rosa‐Caldwell et al. · Biology of Sex Differences · 2019
DOI 10.1186/s13293-019-0257-3
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