Mean and standard deviation values of position and velocity variability in pre- and post-change trials for both sleep deprivation (SD) and control groups.

<p>Note: (*) represent significant pairwise comparisons, which was used for group x trial interaction for both position and velocity variability.</p

Time-series and amplitude spectra of body oscillation and moving room displacement of a representative subject of the control group during a pre-change trial.

<p>Time-series and amplitude spectra of body oscillation and moving room displacement of a representative subject of the control group during a pre-change trial.</p

Mean and standard deviation values of mean sway amplitude in pre- and post-change trials for both sleep deprivation (SD) and control groups.

<p>Note: (*) represent significant pairwise comparisons, which was used for a group x trial interaction.</p

Mean and standard deviation values of gain and phase in all room movement cycles in pre-change, change, and post-change trials for both sleep deprivation (SD) and control groups.

<p>Mean and standard deviation values of gain and phase in all room movement cycles in pre-change, change, and post-change trials for both sleep deprivation (SD) and control groups.</p

Schematic representation of the experimental design employed in this study.

<p>Number of trials and room movement parameters are described for pre-change, change, and post-change trials. Results for all dependent variables were averaged for each subject in the three trials of both pre- and post-change trials. Results of change trials were not included the in analyses.</p

Comparison of the variables related to postural control and psychomotor performance of night workers before and after the night work (n = 20).

<p>Comparison of the variables related to postural control and psychomotor performance of night workers before and after the night work (n = 20).</p

Flow chart of participation in this study.

<p>Flow chart of participation in this study.</p

Effect of sleepiness on the mean sway amplitude of the center of pressure in the anterior-posterior direction of 20 night workers assessed by linear regression analysis.

<p>Effect of sleepiness on the mean sway amplitude of the center of pressure in the anterior-posterior direction of 20 night workers assessed by linear regression analysis.</p