To some extent this is dependent on your individual muscle fiber percentages (e.g. if you have almost entirely slow-twitch fiber, then low reps won't do you much good for hypertrophy).
For the most part, though:
- higher reps (8-12) works more toward hypertrophy (gaining muscle mass), and does less toward gaining motor unit efficiency (so you'll get bigger faster than you'll get stronger)
- lower reps (<5) works more toward improvements in neurological functioning, and less toward muscle mass, so you'll get stronger faster than you'll get bigger.
Bottom line - if you're more concerned about getting bigger, use higher reps. What constitutes "higher" kinda depends on how long you've been training. If you haven't been lifting long, use 10-12 reps. If you've been lifting for a few years, use 8-10.
Other bottom line - do different stuff! If you use mostly high reps, break it up by going low reps for a few weeks.
Up your calories and protein for mass gains.Keep reps between 5-12 on most exercises training pyramid style.This way you hit both types of muscle fibers for complete development.Low reps don`t build size anymor,e than high reps cut you up,it`s mostly dietary changes that accomplish this with intense training.Train as heavy as possible for the amount of reps you`re shooting for whether it`s 5 or 20,work hard!
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