Figure 4.
Optimal number of trials needed after learning phase to get reliable postural control measures during weight-shifting within right lateral and right antero-lateral predefined targets placed at 100% of the subject's limits of stability. Reliable measures on both postural control parameters can be achieved after the learning phase (3 trials) by having the participant perform 2 additional trials. The Y axis show the ICC values. The X axis present the number of additional trials added to the mean of the 3rd and 4th trials. For exemple, the ICC value obtained for the right antero-lateral weight-shifting task (sway area variable) is about 0.53 for the mean of the 3rd and 4th trials. If we add two trials, then we realize 5 trials, the fidelity of the measurement increase up to 0.69.