High insulin levels stimulate protein synthesis and halt breakdown of muscle tissues as you work out. (massgainsource.com)
For example, when we work out with weights, there's a natural breakdown of our muscles — a limitation to what we can lift. (relevantmagazine.com)
Increasing the time under which the muscle tissue is stressed can create greater breakdown of muscle fibers than moving a lighter weight faster. (fitnessandpower.com)