Eccentric

Eccentric movements are emphasized in strength training for their ability to develop muscle strength and size. However, they typically require longer recovery times and can lead to increased muscle soreness compared to concentric movements. This enhanced soreness is often due to disruptions such as calcium disruption within the muscle cells, rather than microtrauma from tears 1.

Muscle soreness from eccentric exercise isn't necessarily from damage, but more from the intense force output and intracellular disruptions these movements cause. This adds to the understanding of muscle soreness, indicating that it's more about these disruptions rather than outright muscle fiber damage.