Eccentric contraction breaks down muscle fibers fast.
In eccentric action, muscles are stretched while contracting. This happens during downhill walking or running or at the end of a long-distance run. Of course, can be achieved in resistance training, and it’s beneficial for hypertrophy in the presence of BCAA in the diet. It’s detrimental in Aerobic exercise if it is excessive as it can lead to muscle atrophy.
Oludare Victor Olayiwola. CFT, MSc. Exercise Physiology.