Evaluation of spasticity by the fast stretch and slow stretch tests

Abstract

A difference of range of motion is found between the fast stretch and slow stretch on flexors of the hip and knee joints, and on extensors of the ankle joint in early childhood. The difference increases up to 6 months, then sharply decreases at 9 months and diminishes around 18 months after birth. This phenomenon is thought to be due to the development of antigravitic extensor postural tone and maturity of balance reaction. In spastic cerebral palsied children, before the clear appearance of spasticity, the phenomenon is different from that of normal children, with limitation of range of motion or existence of laterality. For high risk babies, the fast and slow stretch tests are considered to be useful in early diagnosis of spasticity.