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Figure 3. Results of (a) interface shear stress and (b) interface pressure across applied displacement (0, 10, 15, 20 mm) by material of construction: viscous fluid (n = 5), air cell (n = 7), elastic/VE foam (n = 4), and honeycomb (n = 3). Interface shear stress increased significantly across applied displacement (p ≤ 0.001) and interface pressure did not (p = 0.09). VE = viscoelastic. Akins JS, Karg PE, Brienza DM. Interface shear and pressure characteristics of wheelchair seat cushions. J Rehabil Res Dev. 2011;48(3):203-12.DOI:10.1682/JRRD.2009.09.0145