The mean and standard deviations of postural sway frequency modes for healthy elderly
and fallers are presented in Fig. 2. Postural oscillations for both experimental groups were
measured by means of a Spectral Fourier analysis for both anterior–posterior (AP) and lateral
planes. A two-way ANOVA (Group X Oscillation plane) revealed a significant Group main
effect with respect to frequency mode (F(1, 123) = 15, P < 0.01). As a result, fallers
seem to oscillate at a higher frequency when compared to the healthy elderly. It was also
shown that postural oscillations were much more prevalent in the lateral plane (F(1, 123) =
23, P < 0.01). However, the Group X Oscillation plane interaction was not statistically
significant