Ultimate 6

Want to use hypertrophy training to build serious muscle size and strength?

In this expert review, we analyze a 6-week hypertrophy program and its core principles. We break down the science and the plan to make it work better for you.

Keep reading to learn how you can gain more muscle, burn fat, and achieve your best physique yet.

Muscle hypertrophy occurs through two primary mechanisms: myofibrillar hypertrophy and sarcoplasmic hypertrophy. Myofibrillar hypertrophy involves an increase in the size and number of myofibrils, the contractile units of muscle fibers. This type of hypertrophy is typically associated with lower rep ranges and heavier weights, leading to greater strength gains.

On the other hand, sarcoplasmic hypertrophy focuses on increasing the volume of sarcoplasm, the semi-fluid substance surrounding myofibrils within muscle cells. This type of hypertrophy is often achieved through higher rep ranges and lighter weights, promoting endurance and muscle stamina. Both forms of hypertrophy can be beneficial depending on an individual’s goals, and a well-rounded training program often incorporates elements of both to maximize overall muscle development.

The role of mechanical tension, metabolic stress, and muscle damage cannot be overlooked when discussing hypertrophy. Mechanical tension refers to the force exerted on muscles during resistance training, which stimulates muscle fibers to adapt and grow. Metabolic stress occurs when muscles are subjected to high levels of fatigue, leading to the accumulation of metabolites such as lactate. This stress can trigger hormonal responses that promote muscle growth. Lastly, muscle damage from eccentric contractions—where muscles lengthen under tension—can also stimulate repair processes that contribute to hypertrophy.