Based on the linked source; automatically prepared and checked against the original report.
Research focus
Air cell-based cushions are widely used by people with limited mobility to help prevent pressure ulcers. The study examined whether changes in surrounding atmospheric pressure alter the mechanical surface pressure experienced by users, an effect the researchers said had not been systematically investigated. Its findings come from an abstract summary and should not be treated as treatment recommendations.
Controlled measurements
Researchers developed a measurement approach using dual-range force-sensitive resistor calibration, with a minimum resolution of 0.0012 N/cm² per digit. They tested five scenarios involving ambient-pressure decreases from 30 hPa, comparable to an elevator ride, to 250 hPa, comparable to aircraft takeoff. The experiments covered 150 series combining five initial cushion pressures with six load levels.
Reported pressure and risk changes
Pressure increased in every tested condition as ambient pressure fell, ranging from an average 11.2% change at 30 hPa to 62.0% at 250 hPa, with substantial variability reported. A pressure-time cell-death model placed as many as 66.7% of conditions into a different risk category. Estimated mean reductions in time to cell death ranged from 16 to 55 minutes and followed a logarithmic relationship.
