--- title: "Meaning & Key Takeaway of: myofibrillar hypertrophy, more actin…" description: "\"“myofibrillar hypertrophy, more actin, myosin, and other associated proteins are added to those already existing in the cell. More contractile elements..." image: "https://sms4smile.com/quotes/i/f65/mark-rippetoe-9495_exercise_myofibrillar-hypertrophy-more-actin-myos_136245.png" --- # myofibrillar hypertrophy, more actin, myosin, and other… ![“myofibrillar hypertrophy, more actin, myosin, and other associated proteins are added to those already existing in the cell. More contractile elements within the cell mean more actin/myosin interactions and more force production. This type of hypertrophy is typical of low-repetition…” quote by Mark Rippetoe](https://sms4smile.com/quotes/i/f65/mark-rippetoe-9495_exercise_myofibrillar-hypertrophy-more-actin-myos_136245.png) [Download](https://sms4smile.com/quotes/i/f65/mark-rippetoe-9495_exercise_myofibrillar-hypertrophy-more-actin-myos_136245.png) [Open image](https://sms4smile.com/quotes/i/f65/mark-rippetoe-9495_exercise_myofibrillar-hypertrophy-more-actin-myos_136245.png) > ““myofibrillar hypertrophy, more actin, myosin, and other associated proteins are added to those already existing in the cell. More contractile elements within the cell mean more actin/myosin interactions and more force production. This type of hypertrophy is typical of low-repetition, high-intensity training. It adds less mass but produces greater increases in the force generated per unit area of muscle than the second type of hypertrophy, sarcoplasmic hypertrophy.”” [Mark Rippetoe](https://sms4smile.com/quotes/author/mark-rippetoe/) ## About This Quote This interpretation was drafted with AI assistance. It is one reading of the quote, not the author's own explanation. Low‑rep, high‑intensity training boosts contractile proteins, increasing muscle force per area more than volume‑focused growth. **In simple terms:** Heavy reps build stronger muscles. Key Takeaway Train heavy for strength. Themes fitness muscle physiology strength training Mood determined focused Type instructional technical When to use this quote - weightlifting - sports performance - rehab Key Concepts myofibrillar hypertrophy protein synthesis Questions to Reflect On - Do you prioritize strength or size? - How will you adjust your program? 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