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Spontaneous Improvement in Postural Control after Stroke: A Longitudinal Prospective Study

Ana Francisca Rozin Kleiner, Manuela Galli, Paula Teixeira Fernandes, Chiara Rigoldi, Aline Araújo do Carmo, Ricardo M. L. Barros

This study aimed to investigate the possible spontaneous recovery in postural control in post-stroke survivors during quite standing at different periods from stroke event, using the center of pressure sway analysis (the antero-posterior and median-lateral direction pattern analysis). Twelve participants in the chronic post-stroke phase and twelve age-matched healthy subjects were barefoot and were instructed to maintain an upright standing position for 60s on a force platform. The data were collected in two conditions: eyes open and eyes closed. The stroke participants were evaluated in 3 different periods. The time and frequency domain analyses of center of pressure signal were performed in order to obtain center of pressure descriptors in both the antero-posterior and mediolateral directions. Statistical analysis was performed to compare groups, periods and conditions. The results pointed out a worst postural control when the visual feedback is off for pathological group: patients in the post-acute phase of stroke tend to rely more on visual information for postural control. The spontaneous balance recovery in individuals with post-acute stroke is characterized by increased visual dependency compared to normal subjects.