Research Letter

Gait variability in younger and older adult women is altered by overground walking protocol SIR—Measures of gait variability are now commonly used to study age-related gait changes [1–7]. Some studies have shown that older adult fallers, and those identified with an increased falls risk, exhibit greater variability in basic spa-tiotemporal measures of gait when compared to both older adult non-fallers [2, 4, 5] and younger adults [4]. However, other work has reported no differences in measures of gait variability between healthy younger and older adults [6], healthy and frail older adults [7] and older adult fallers and non-fallers [1, 3]. A possible reason for the ambiguous findings of the pre-vious studies may lie in the different walking protocols use