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Meta-analysisSleep recovery
A meta-analysis found that protein supplementation augments gains in muscle mass and strength during prolonged resistance training, with benefits plateauing beyond a total intake of roughly 1.6 grams of protein per kilogram of body mass per day. Adequate protein is a support variable for training-induced adaptation.
How Fibral applies it: Recommend a daily protein intake around 1.6 g/kg of body mass to support resistance-training adaptations; more than that yields little added benefit.
Limits and applicability
No limitation statement has been published for this note yet. Treat it as a general evidence-informed rule, not an individualized guarantee.
- Morton RW, Murphy KT, McKellar SR, et al. (2018). A systematic review, meta-analysis and meta-regression of the effect of protein supplementation on resistance training-induced gains in muscle mass and strength View source
Approved content v3 · updated Aug 17, 2026
ObservationalSleep recovery
Observational work found that higher chronic life stress is associated with slower short-term recovery of muscular performance following resistance exercise, so psychological stress can prolong the fatigue produced by training. Recovery capacity is influenced by factors beyond the training session itself.
How Fibral applies it: Account for a lifter's life-stress load when setting volume and recovery; scale back training demands during high-stress periods.
Limits and applicability
No limitation statement has been published for this note yet. Treat it as a general evidence-informed rule, not an individualized guarantee.
- Stults-Kolehmainen MA, Bartholomew JB (2012). Psychological stress impairs short-term muscular recovery from resistance exercise View source
Approved content v4 · updated Aug 17, 2026
Expert consensusSleep recovery
Reviews of sleep and muscle indicate that inadequate sleep is associated with impaired recovery, reduced muscle protein synthesis signaling, and blunted strength expression, making sufficient sleep an important support for resistance-training adaptation. Chronic short sleep works against the recovery that training gains depend on.
How Fibral applies it: Treat adequate nightly sleep as a foundation for recovery and adaptation, and treat chronic sleep restriction as a limiter of progress on compound lifts in particular.
Limits and applicability
No limitation statement has been published for this note yet. Treat it as a general evidence-informed rule, not an individualized guarantee.
- Knowles OE, Drinkwater EJ, Urwin CS, Lamon S, Aisbett B (2018). Inadequate sleep and muscle strength: Implications for resistance training View source
Approved content v4 · updated Aug 17, 2026
Meta-analysisSleep recovery
A meta-analytical review found that acute sleep loss impairs physical performance, with effects tending to be larger for tasks performed later in the day and for sustained or endurance efforts. Sleep deprivation degrades the ability to express and recover from training.
How Fibral applies it: Protect sleep as a training variable; after a night of substantial sleep loss, reduce loads or expectations rather than testing maximal performance.
Limits and applicability
No limitation statement has been published for this note yet. Treat it as a general evidence-informed rule, not an individualized guarantee.
- Craven J, McCartney D, Desbrow B, et al. (2022). Effects of Acute Sleep Loss on Physical Performance: A Systematic and Meta-Analytical Review View source
Approved content v3 · updated Aug 17, 2026