To perceive how completely different types of weight coaching have an effect on the human physique, you first have to understand that there are various kinds of muscle fibers being exerted.
There are two classes of muscle fibers: Fast-twitch muscle fibers and slow-twitch muscle fibers1, they usually every serve a function.
Per the National Academy of Sports Medicine, fast-twitch muscle fibers assist fast and highly effective actions whereas slow-twitch muscle fibers assist endurance actions. You can consider quick and slow-twitch fibers just like the tortoise and the hare. Fast-twitch fibers tire out as rapidly as they will transfer, whereas slow-titch fibers assist well-paced actions and are far more fatigue-resistant.
According to movie star coach and founding father of the NWMethod, Nicole Winhoffer, you’ll see completely different outcomes in case you’re lifting fewer repetitions of heavier weights than in case you had been to do extra reps of lighter weights since you’re working completely different muscle fibers, and exercising them in a different way.
“Lifting heavier requires larger dominant muscle groups (ie. bicep, tricep, quad, and glute) to complete more work and recruit more muscle fibers to lift the load,” Winhoffer explains. This signifies that these focused muscle teams will bulk up. When you elevate extra reps of lighter weights, you encourage slow-twitch muscle fibers, constructing a extra even tone over time.