Novel algorithm for a smartphone-based 6-minute walk test application: algorithm, application development, and evaluation

Table 3 Foot strike identification

Participant	Primary acceleration	# Steps from video	# Steps by algorithm	Accuracy	Time difference of foot strikes from video (s)
1	Forward	716	716	100.0%	0.02 ± 0.026
2	Forward	695	695	100.0%	0.02 ± 0.012
3	Forward	650	646	99.4%	0.02 ± 0.052
4	Forward	716	716	100.0%	0.01 ± 0.007
5	Forward	650	650	100.0%	0.02 ± 0.011
6	Vertical	663	662	99.9%	0.03 ± 0.030
7	Forward	758	758	100.0%	0.01 ± 0.007
8	Forward	726	726	100.0%	0.01 ± 0.006
9	Forward	752	752	100.0%	0.01 ± 0.011
10	Forward	635	635	100.0%	0.01 ± 0.009
11	Forward	647	647	100.0%	0.01 ± 0.012
12	Forward	607	607	100.0%	0.01 ± 0.008
13	Forward	617	617	100.0%	0.01 ± 0.008
14	Forward	652	652	100.0%	0.01 ± 0.010
15	Forward	746	746	100.0%	0.02 ± 0.020

ISSN: 1743-0003