Maturation of gait dynamics: stride-to-stride variability and its temporalorganization in children

In very young children, immature control of posture and gait results in uns teady locomotion. In children of similar to 3 yr of age, gait appears relat ively mature; however, it is unknown whether the dynamics of walking change beyond this age. Because stride dynamics depend on neural control, we hypo thesized that motor control would continue to develop beyond age 3. To test this hypothesis, we measured the gait cycle duration on a stride-by-stride basis in 50 healthy 3- to 14-yr-old children (25 girls). Measurements of s tride-to-stride variability were significantly larger both in the 3- and 4- yr-old children, compared with the 6- and 7-yr-old children, and in the 6- and 7-yr-old children, compared with the 11- to 14-yr-old children. Measure ments of the temporal organization of gait also revealed significant age-de pendent changes. The effects of age persisted even after adjusting for heig ht. These findings indicate that mature stride dynamics may not be complete ly developed even in healthy 7-yr-old children and that different aspects o f stride dynamics mature at different ages.