ArticleJournal of physical therapy science2025
Influence of adjustable back-support on the effectiveness of seat-cover assembly in reducing the shear force applied to the buttocks during combined reclining and tilt-in-space functions.
Article in Journal of physical therapy science, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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7 authors.
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Abstract
[Purpose] We aimed to investigate how the effectiveness of the seat-cover assembly (ScA) in reducing shear force fluctuations on the buttocks is influenced by the incorporation of reclining, tilt-in-space, and adjustable back-support functions. [Participants and Methods] Fifteen healthy adult males participated (mean age: 33.1 ± 10.4 years). Parallel forces, which were used as indicators of shear forces on the buttocks, were measured using a portable force plate. Participants were exposed to a 10° tilt and a reclining angle between 100° and 130° using an experimental chair equipped with either an adjustable back-support (aBS) or a flat back-support (control condition). [Results] The peak parallel forces were 13.3 ± 1.7% of body weight (%BW) and 11.6 ± 1.9%BW under the aBS and control conditions, respectively. The median range of parallel force fluctuations was 10.2 (9.4‒10.7) %BW with the aBS and 8.8 (8.0‒10.5) %BW with the control. The aBS condition showed significantly higher values than the control condition for both metrics. [Conclusion] These results suggest that integrating adjustable back-support mechanisms compromises the effectiveness of the ScA in stabilizing shear forces during combined reclining and tilt-in-space functions. Future designs should optimize back-support systems to preserve the effectiveness of ScA while maintaining postural alignment.
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