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Originally Posted by peter12
Where's the science for this? Interested to see.
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I'm just on my phone but it's pretty simple. Imagine a biceps curl. Starting from close to the bottom and curling up is a concentric motion. It does not tear the muscle fibers or cause any soreness. But it does increase strength. And you can do that motion every day so you gain quickly. Lowering the weight in a biceps curl is an eccentric motion and like pulling a rubber band apart will lead to the small tears that cause soreness. That you must rest to recover from. Deadlifting is comprised of both as are most compound movements. Lifting is concentric whole lowering is eccentric. Lifting lighter weight more often in concentric lifts is what most heavy lifters are doing now to gain size and strength.