George E. Goslow

TL;DR: A cinematographic analysis of the unrestrained walking, trotting, galloping, jumping and landing movements of 11 adult cats was undertaken to provide previously unavailable information concerning the demands imposed on the nervous system for the control of low and high speed movements.

TL;DR: It is emphasized that soleus tendon organs are sufficiently sensitive to passive forces that muscle stretch can influence Ib input to the spinal cord in normal postural and locomotor activity.

TL;DR: General observations on muscle action revealed that PL is an ankle extensor as well as a digit flexor, and PL and FHL were shown to be the major force contributors to digit flexion with FDL playing a lesser but still significant role.

TL;DR: The low passive stretch responsiveness of muscle spindles and tendon organs encountered by Severin et al. 33 during controlled walking of the high decerebrate cat is shown to be not attributable to an inadequate extent, range and rate of stretch during the F phase of the step.

TL;DR: A cinematographic analysis of the unrestrained walking, trotting, galloping, jumping and landing movements of 11 adult cats revealed that locomotor movements involve 3 basic patterns of muscle displacement for the ankle extensors: a large near-static stretch that is alpha-gamma passive (as occurs in crouching), a large dynamic stretch and another dynamic stretch which involves co-activation of alpha and gamma systems.