English Muscle contraction Cited by user 144.130.153.130 on 12 Jan 2018 Muscle contraction is the activation of tension-generating sites within muscle fibers.
English Neural control of limb stiffness Cited by user Zeronaught on 16 Nov 2015 As humans move through their environment, they must change the stiffness of their joints in order to effectively interact with their surroundings.