Definition: The negative or lowering phase of an isotonic contraction—also called negative curls. An example would be the lowering phase of a bicep curl.
What some people don't know is that it's the eccentric contraction that often causes muscle soreness because, as you lower the weight, your muscle is actually stretching at the same time they are contracting. This can result in muscle soreness, but it's a temporary soreness that should go away in a few days after exercise.
