[Purpose] To clarify the effect of asymmetrical buttock pressure on the shear forcesexerted on a buttock. [Participants and Methods] Sixteen healthy adult males participatedin this study. A cushion 0 or 2 cm high was placed on the left side of the seat for allparticipants. The 0- and 2-cm height conditions were called “without difference condition”and “difference condition”, respectively. The back support was inclined at increasingangles, starting at the upright position, to a fully reclined position, and back to theupright position. [Results] With the “difference condition”, the force on the left buttockwas 147.4% body weight and that on the right buttock was 105.6% body weight. In contrast,with the “without difference condition”, there was no significant difference in the forceon the left buttock and right buttock in terms of percent body weight. [Conclusion] Ourresults suggest that asymmetrical buttock pressure while in the sitting position causes adifference in shear force exerted on the left and right buttocks when using a recliningchair.
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