Validation of a Biofeedback System for Wheelchair Propulsion Training

Table 2

Validation of 𝐹_𝑥𝑦 measurements.

Wheel angle (degrees)	Actual force = 23.28 N		Actual force = 68.04 N		Actual force = 109.99 N
	Measured force (N)	Error (%)	Measured force (N)	Error (%)	Measured force (N)	Error (%)
0	23.11 ± 1.59	−0.74	66.55 ± 1.65	−2.19	108.68 ± 1.47	−1.19
45	23.75 ± 1.66	2.02	67.05 ± 1.74	−1.45	109.17 ± 1.47	−0.75
90	22.94 ± 1.21	−1.48	66.26 ± 1.53	−2.62	108.25 ± 1.35	−1.59
135	24.04 ± 1.63	3.24	67.39 ± 1.35	−0.96	109.45 ± 1.44	−0.49
180	23.85 ± 1.47	2.43	67.08 ± 1.50	−1.42	109.23 ± 1.70	−0.69
225	23.38 ± 1.68	0.41	66.65 ± 1.75	−2.05	108.92 ± 1.59	−0.97
270	22.75 ± 1.34	−2.28	65.84 ± 1.42	−3.23	107.78 ± 1.41	−2.01
315	22.40 ± 1.89	−3.80	65.51 ± 1.64	−3.72	107.43 ± 1.57	−2.33

Measured values are mean ± 1 standard deviation.