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.
Kenichi Kobara, Yasuyuki Nagata, Hisashi Takahashi and 4 others
PMID 41328278WHAT IT FOUND
With a seat-cover assembly and tilt-in-space in place, shaping the back support to match simulated kyphosis increased peak shear force during return and widened force fluctuation, compared with a flat back support.
Key findings
01When the seat-cover assembly was used in both conditions, the adjustable back-support condition produced higher peak and return upright parallel force than the control condition.
02When the seat-cover assembly was used in both conditions, the adjustable back-support condition produced a larger range of parallel force fluctuation than the control condition.
03When the seat-cover assembly was used in both conditions, no significant differences were observed during the initial upright or reclining phases.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
Participants were healthy adult males with intact skin, not older or disabled wheelchair users. Spinal kyphosis was simulated with an orthosis, so real spinal deformity and skin condition were not tested. The study measured parallel force on a force plate, not pressure ulcers or patient-reported discomfort. Only the tested chair dimensions, cushion, and seat-cover assembly were used. The sample was 15 participants in a short laboratory task, not clinical follow-up.
Declared interests
Funded by JSPS KAKENHI grant 22K11303. Authors declared no competing interests.
The easy way to misread this
Do not conclude that adjustable back support alone causes pressure ulcers in older wheelchair users. The tested setup included a seat-cover assembly, reclining, tilt-in-space, a cushion, and a simulated kyphosis orthosis, and the measured outcome was parallel force, not skin injury.
Summarised by AI from the full paper, without a clinician reviewing it. Check it against the source before it changes what you do. Read it on PubMed →