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1 Margret H. A. Rey Laboratory
for Nonlinear Dynamics in Medicine,
2 Gerontology Division and Department of
Medicine,
In very young children, immature control of
posture and gait results in unsteady locomotion. In children of ~3 yr
of age, gait appears relatively mature; however, it is unknown whether the dynamics of walking change beyond this age. Because stride dynamics
depend on neural control, we hypothesized 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 stride-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.
Measurements of the temporal organization of gait also revealed
significant age-dependent changes. The effects of age persisted even
after adjusting for height. These findings indicate that mature stride
dynamics may not be completely developed even in healthy 7-yr-old
children and that different aspects of stride dynamics mature at
different ages.
age; walking; spectral analysis; fractal analysis
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