The effect of accelerometer location on the classification of single-site forearm mechanomyograms

Table 1 Degradation in classification accuracy across sensor positions

Participant	Accuracy C₃ (%)	A1-A3	A2-A3	A4-A3	A5-A3
		ΔC _1,3	ΔC _2,3	ΔC _4,3	ΔC _5,3
1	69.8 ± 4.3	7.5 ± 4	6.5 ± 4	6.8 ± 3	1.9 ± 3
2	71.0 ± 5.9	4.0 ± 4	6.9 ± 5	1.5 ± 5	2.0 ± 4
3	69.6 ± 4.5	5.7 ± 4	6.6 ± 4	7.7 ± 5	7.4 ± 5
4	74.6 ± 2.7	11.4 ± 4	4.7 ± 4	10.0 ±	7.5 ± 4
5	75.1 ± 4.2	11.8 ± 4	12.9 ± 4	1.7 ± 3	4.5 ± 4
6	69.1 ± 3.9	7.2 ± 5	5.7 ± 4	9.1 ± 5	1.5 ± 4
7	76.2 ± 4.3	14.9 ± 3	17.4 ± 3	4.6 ± 5	2.1 ± 4
8	71.2 ± 4.4	2.0 ± 3	0.8 ± 2	11.1 ± 5	3.6 ± 5
9	73.1 ± 3.0	5.9 ± 3	5.6 ± 3	7.2 ± 4	1.0 ± 3
10	76.4 ± 3.4	7.7 ± 4	1.0 ± 4	6.4 ± 3	0.9 ± 3
11	76.8 ± 3.0	1.4 ± 3	1.7 ± 2	4.9 ± 3	1.7 ± 3
12	69.7 ± 3.9	14.1 ± 5	12.2 ± 2	4.6 ± 3	4.9 ± 3
Avg	72.7 ± 0.6	7.8 ± 5	6.8 ± 6	6.3 ± 4	3.0 ± 4

Values shown are mean ± standard deviation across all trials. Bold and italic values indicate that C_iand C₃ are significantly different (p < 0.05). Italic values indicate that the accuracy of the locally-trained classifier at this location was lower than that of A3, suggesting that this recording site yields signals that poorly reflect FCR activity.

ISSN: 1475-925X