Fitness
Muscle Protein Breakdown
Muscle protein breakdown dismantles muscle protein during stress and fasting—balance it with synthesis via protein, sleep, and managed training load.
Muscle protein breakdown (MPB) is the dismantling of muscle proteins during fasting, illness, and hard training—balanced by muscle protein synthesis when recovery and protein intake are adequate. Extended deficits, low protein, and overtraining raise MPB relative to synthesis.
Sleep and leucine-rich meals tilt the balance toward repair.
Common questions
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Does fasted cardio increase muscle protein breakdown?
Fasted sessions can raise MPB slightly; total daily protein and weekly volume matter more. Add protein after if you train hard fasted.
Related terms
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