Why hy heavier dumbbells are better than n lighter ones.
Bigger dumbbells get you faster strength gains than lighter ones do, not because they create more muscle (science shows both sizes pump up mass equally well with sufficient reps) but because they’re likely better at training your nervous system to give you more juice, a new study in Frontiers in Physiology finds. “Lifting heavier weights may activate your body’s motor unit pool – that is, the brain-to-muscle signalling system – more fully,” says study author Nathaniel Jenkins. What’s more, repeatedly cranking this communication could increase the physical force muscles are able to produce in the long run. Nathaniel says in order to net the power boost, choose a weight that’s challenging enough that you can complete only eight to 10 reps with it per set.