Rate of Force Development
Rate of Force Development (RFD): The speed at which force and velocity develop, i.e. acceleration. This is a key factor in all high-velocity activities.
Image: Li, Jizhou & Zhou, Yongjin & Zheng, Yong-Ping & Li, Guanglin. (2015). An Attempt to Bridge Muscle Architecture Dynamics and Its Instantaneous Rate of Force Development using Ultrasonography. Ultrasonics. 61. 10.1016/j.ultras.2015.03.009.