FIGURE 1.

Graphical representation of the hypothesized changes across the lifespan. During unperturbed and perturbed walking, we expect step width to increase and bilateral single support time to decrease with increasing age. These age-related changes will cause the ML MoS to increase. With increasing age, step length will decrease, which will cause the AP MoS to decrease. The * next to the line from age to walking speed indicates that although there is a well-documented effect of age on walking speed, walking speed is fixed throughout the experiment, and thus there are no effects on walking speed.