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Comparison of seat, waist, and arm sit-to-stand assistance modalities in elderly population

This study investigates the mechanics of assisted sit-to-stand motion in order to understand how various assistance modalities can facilitate the motion while still requiring activation of leg muscles. The relevance of this research lies in the importance of sit-to-stand motion for independent functioning and daily activities in ambulatory adults. The study conducted experiments with 17 older adults, evaluating different modes of rise and analyzing biomechanical metrics relating to stability, knee effort reduction, and rise trajectory. The results show that seat and waist assistance provided significant improvements in stability metrics and reductions in required knee torques compared to unassisted rises and bar assistance. The subjects preferred seat and bar assistance. The conclusion suggests that seat-assisted sit-to-stand modality is favored for nonclinical applications, and further testing with clinical populations is recommended.

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Comparison of seat, waist, and arm sit-to-stand assistance modalities in elderly population

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  1. Comparison of seat, waist, and arm sit-to-stand assistance modalities in elderly population Jeswin Jeyasurya, MASc; H. F. Machiel Van der Loos, PhD; Antony Hodgson, PhD; Elizabeth A. Croft, PhD

  2. Aim • Investigate mechanics of assisted sit-to-stand (STS) motion to better understand how load-sharing STS mechanisms may facilitate STS motions while still requiring activation of leg muscles. • Relevance • STS motion is important for ambulatory adults’ independent function and daily activities. • However, full dependence on mechanical STS assistance can lead to leg muscle atrophy.

  3. Method • Conducted experiments with 17 nondisabled older adults performing: • Unassisted STS rises. • Assisted STS rises with grab bar, arm, seat, and waist assistance. • Evaluated: • Each mode of rise base on subject questionnaire. • Key biomechanical metrics relating to stability, knee effort reduction, and rise trajectory.

  4. Results • Seat and waist assistance provided: • Significant improvements in stability metrics. • Reductions in required knee torques over unassisted rises and bar assistance. • Subjects preferred seat and bar assistance.

  5. Conclusion • Seat-assisted STS modality is favored for nonclinical applications. • Further testing of this modality with clinical population is indicated.

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