Figure 1.
Illustration of the set-up and the model for Center of Mass (CoM) calculation utilized in this experiment, showing a silhouette of a subject standing in the middle of a forceplate with marker placement superimposed (in white actual makers and in grey estimated joint centers) and the display of the CoM feedback (red sphere).
The white sphere in the centre represents target which moved in the mediolateral (ML) direction following the patterns depicted in the bottom panel: predictable (top) and unpredictable (bottom). An insertion of foot soles is presented showing foot positioning during the experiments (stance width and angle).
Table 1.
Top part of the table shows demographics for all participants.
Figure 2.
Averaged curves (± sd) for phase shift (top panel), gain (mid panel) and coherence (bottom panel) measures using both, predictable target (left) and unpredictable (right) targets, during first (continuous line) and second (dashed line) sessions and for the younger (in black) and the older adults (in dark grey).
Grey shading indicates the ± sd for all subjects and for all trials. Markers inserted in the plots indicate means for performance descriptors for the first session (circular markers) and second session (diamond markers) for the younger (in black) and the older adults (in dark grey).
Table 2.
Descriptive statistics for MELBA performance descriptors (fPS, PSmean, fG and Gmean) for the predictable and unpredictable targets.
Table 3.
Intraclass correlations (absolute agreement) for the performance descriptors (fPS, PSmean, fG and Gmean) for both visual tracking tasks (predictable and unpredictable) for all subjects and stratified by age group.