Postural tasks and somatosensory constraints change the spatial distribution of center-of-pressure speed in young healthy volunteers

Abstract

Introduction: Several studies investigated the undisturbed upright standing considering postural control theories based on the position or velocity of the center of pressure (CoP). The spatial distribution of high-speed regions (HSR) in the statokinesigram and the effect of somatosensory restriction on this distribution are unknown. Objective: To discuss and compare two theories of postural control based on CoP position and velocity, and to assess the effects of different postural tasks and somatosensory restriction on the spatial distribution of HSR. Methods: Thirteen healthy volunteers (8 women, 27 ± 5 years) performed two blocks of tests on force platform for 60 seconds with different postural tasks, separated by 25 minutes of hypoxic ischemic. HSR metrics were analyzed. Results: A significant increase (P=0.002) in HSR was observed. Interaction between tasks and restriction was significant for the average distance [Wilks' Lambda = 0.708, F (1,12) = 4.961, P = 0.046, η2 = 0.292]. Conclusion: Postural responses are characterized by different spatial speed patterns of CoP, especially greater quantity and greater distance of HSR from CoP center.