myofibrillar hypertrophy

Definition

Muscle growth from increasing the size and number of contractile proteins (myofibrils), making muscles denser and stronger rather than just puffier. It's the 'actual strength' type of muscle growth as opposed to just looking swole.

Example Usage

Heavy strength training with low reps emphasizes myofibrillar hypertrophy over the sarcoplasmic kind bodybuilders chase.

Origin

From muscle physiology distinguishing types of hypertrophic adaptation

Fun Fact

Powerlifters prioritize myofibrillar hypertrophy while bodybuilders chase both types, which partially explains why powerlifters often look less jacked despite being stronger.

Source: Muscle physiology research and strength training science

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