CK-MM is the muscle-specific form of creatine kinase, an enzyme released into the blood when muscle cells are stressed, damaged, or recovering from intense use. This marker reflects how hard your skeletal muscles are working—or how much they’re breaking down. Elevated levels can signal overtraining, poor recovery, or injury, while optimal levels indicate healthy muscle metabolism and adaptation. Useful for tracking training load, recovery status, or identifying hidden muscle strain.
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