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Background In Daily Living Activities, the ‘Sit-to-Stand’ movement is essential to carry out several tasks, many of them starting from sitting and needing to get up. This movement stimulates a set of important muscles in the context of physical-motor activity and lower limb rehabilitation procedures. This work presents an interactive biomechanical device, based on two instrumented arms, to monitor the support force and arms angle, necessary to perform the ‘Sit-to-Stand’ movement. Methods The prototype incorporates aluminum support and two tubular arms instrumented with eight strain gauges, connected to a NI data board and a PC, allowing the quantification of the force applied during the sit-to-stand performance as well as the angle of the arms. A Labview user interface interacts with the user and the data can be visualized and recorded during the time. Results The device has been tested with a group of healthy volunteers, performing a sit-to-stand test protocol from a chair. In all the tests, the force applied, and the hand position have been quantified during the time necessary to perform the task. Conclusions The biomechanical device provides the quantification and identification of the harm force and position during the sit-to-stand movement. The system can be used as a force-time/position-time analysis, providing the analysis of recovery in patients who are undergoing physical-motor rehabilitation procedures of the lower limbs, such as post-stroke patients and institutionalized geriatric populations. The device can also allow biofeedback stimuli in rehabilitation activities through a graphical computer interface, such as a game.

Biomechanical device for quantification of parameters associated with the ‘sit-to-stand’ patients performance