Hormonal
Insufficient or fragmented sleep reduces skeletal muscle protein synthesis rates and promotes a catabolic hormonal environment (elevated cortisol, reduced testosterone/GH), leading to potential loss of lean mass and strength over time.
Prioritize 7-9 hours of sleep nightly to protect muscle mass. Sleep loss directly reduces your body's ability to build muscle (protein synthesis) and shifts hormones toward breaking it down (catabolism). If you are training hard, poor sleep undermines your gains more than you might think. Consistency in sleep duration is as important as consistency in training.
Fragmented or insufficient sleep also perturbs the hormonal milieu, shifting it towards a catabolic state, resulting in reduced rates of skeletal muscle protein synthesis.
Why this rating
The paper is a review citing multiple human studies (Saner et al., Lamon et al.) showing consistent reductions in MPS with sleep restriction, alongside rodent data.
Source
Sleep, circadian biology and skeletal muscle interactions: Implications for metabolic health
Matthew Morrison et al. · Sleep Medicine Reviews · 2022
DOI 10.1016/j.smrv.2022.101700
More from this paper
- Circadian misalignment and sleep loss disrupt peripheral clocks in skeletal muscle, leading to impaired mitochondrial function, reduced glucose tolerance, and increased insulin resistance.Good
- High-intensity interval exercise (HIIE) or resistance training can mitigate the negative effects of sleep restriction on muscle protein synthesis, preserving synthesis rates despite sleep loss.Moderate
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