Every programme rests on some idea of what drives muscle growth. This episode looks at where the molecular and applied research supports that thinking - and where it does not.

Professor Michael Roberts is a professor at Auburn University and one of the world's leading researchers on skeletal muscle hypertrophy, with a laboratory spanning cell culture, rodent models, and applied human research.

In this episode, you will learn:

• What is happening inside a muscle cell when it grows

• Why mechanical tension appears to be central to hypertrophy

• What the evidence shows about testosterone and the androgen receptor in muscle

• Why women with much lower testosterone than men can still make similar relative gains with resistance training

• Where the evidence lands on rep ranges and weekly set volume

• Why drop sets are unlikely to add much once sufficient tension and volume are already in place

• What sarcoplasmic hypertrophy is, and when it may occur

• Why recent research suggests muscle fibres may grow by adding more myofibrils, not just by making existing ones bigger

Key insight:

Consistent mechanical tension, applied through a moderate rep range and sufficient weekly volume, appears to be a central driver of hypertrophy. The more complex the technique, the less likely it is to add much on top of that foundation.

Resources & Links

Dr. Tony Boutagy - https://tonyboutagy.com Follow on Instagram - https://www.instagram.com/tonyboutagy/ Professor Michael Roberts - https://education.auburn.edu/directory/profile.php?id=mdr0024Molecular and Applied Sciences Laboratory - https://education.auburn.edu/kinesiology/research/molecular-applied-sciences/index.phpRoberts Lab eLife paper on myofibril adaptations - https://elifesciences.org/articles/92674