INTRODUCTION Aim of this study is to verify if physical activity can influence postural control and balance in healthy subjects, through an easily-applicable protocol. METHODS SETTING: laboratory of analysis of movement. PARTICIPANTS: 20 healthy sportsmen of competitive level (age 23±4, height 173±10 cm, weight 65±11 kg) and 20 healthy sedentary subjects (age 25±4, height 175±9 cm, weight 68±11 kg). MATERIALS: 3 different conditions have been taken into consideration: stance (BIP), one-leg stance (on the dominant limb) (MON), and one-leg stance (on the dominant limb) but with joint knees and hands behind the back (MON VINC). For each one of these 3 conditions, 3 trials with open eyes (marked with “OO”) and 3 trials with closed eyes (marked with “XX”) have been acquired, spaced out. Each trial lasted 25 seconds. They were performed on a force platform Kistler 9682A, whose data were acquired by a 100 Hz frequency. 9 markers were placed on each subject, corresponding to: left and right heel, left and right I metatharse, left and right V metatharse, left and right II foot-finger, and one on C7. The position of each marker was acquired by ELITE 2000 system (100 Hz). MEASUREMENTS: sway path (SP), average speed of center of pressure on sagittal (vAP) and on frontal plan (vML), average (C7RMS) and maximum (C7MAX) shifting of C7 marker, sway of I met marker (SwayIMet) and number of failures (NINS) in one-leg stance trials. In accordance with [1] all the results have been normalized to the subject’s height. The dependence of the measured variables on the level of physical activity was studied trough a (one-way) ANOVA, with the belonging-group (sportsmen, sedentary subjects) taken as factor. RESULTS The total number of failures in one-leg stance trials is showed in the figure 1. The results of the ANOVA are resumed in the table 1.