Table 1.

Summary of FSR tests used in this study

Test	Description
Drift during static compression	Static loads applied increasing from 10 to 200 kPa for 5 min each. Sensor drift was assessed at time points of 30 s increments.
Drift during cyclic compression	Cyclic loading profile of 0–300 kPa applied at 1 Hz. Sensor drift was assessed. Test occurred during the first “walk” cycle in the walk–sit–stand test and was analyzed separately from the rest of the walk data.
Walk–sit–stand accuracy	Mimicked variable activity protocol typical of prosthesis use, including compressive loads of 90 s each: cyclic 0–300 kPa (walk), static 10 kPa (sit), then 90 s static 30 kPa (stand). Repeated five times consecutively. Sensor accuracy and drift were assessed.
Effect of curvature	Static compression applied to test apparatuses of three different curvatures. Pressures ranged from 50 to 300 kPa, 15 s each. Sensor measurements on curved surfaces were compared to the flat condition to determine the effect of curvature.
Effect of shear	Static compression applied along with varying levels of shear stress. Sensor measurements when shear was present were compared to the compression-only measurements to characterize the effect of shear.