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Background  The sit-to-stand (STS) test is usually included in the clinical assessment of balance and its instrumented analysis may support clinicians in objectively assessing the risk of falling. The aim of the present study was to assess if kinetic parameters of STS collected using a force platform, with particular focus on the raising and stabilization phase, could discriminate between young and older adults.    Methods  Twenty-four adults (age ranging from 18 to 65 years old) and 28 elderly adults (older than 65 years old) performed STS on a force platform. Data on ground reaction forces, sway, displacement and velocity of the center of pressure were gathered during the raising and the stabilization phases.    Results  elderly subjects showed significant greater global sway (146.97 vs 119.85;  p  < 0.05) and a higher velocity (vs 40.03 vs 34.35 mm/s;  p  < 0.05) of execution of STS. Between-group comparisons highlighted a greater postural sway in the raising phase (21.63 vs 13.58;  p  < 0.001) and a doubled sway during the stabilization phase (12.38 vs 4.98;  p  < 0.001).    Conclusions  The analysis of STS performed on a force platform provides further information about the age-specific pattern of STS execution. The stabilization phase of STS seems to be the more challenging for functional independent older adults and should be considered during balance assessment.  Further studies are needed to confirm findings and improve generalizability of this study.

archives of physiotherapy

Raising and stabilization phase of the sit-to-stand movement better discriminate healthy elderly adults from young subjects: a pilot cross-sectional study