Table 4.
Comparison of kinetic and kinematic variables during different specific imitation motions between the AMTI force plate, PedarX and OpenGo.
| mean ± SD |
Bias (%) |
95% limits of agreement (% grouped mean) |
|||||||
|---|---|---|---|---|---|---|---|---|---|
| AMTI | PedarX | OpenGo | OpenGo vs. AMTI | PedarX vs. AMTI | OpenGo vs. PedarX | OpenGo vs. AMTI | PedarX vs. AMTI | OpenGo vs. PedarX | |
| Back–Forth Jump | |||||||||
| GCT (s) | 0.66 ± 0.16† | 0.78 ± 0.15† | 0.81 ± 0.17† | 0.15 (22%) | 0.11 (17%) | 0.03 (5%) | 0.05 (7%) | 0.07 (10%) | 0.09 (12%) |
| Impulse (Ns) | 726 ± 180 | 727 ± 158 | 480 ± 111† | −242 (−34%) | 7 (0%) | −250 (−34%) | 167 (28%) | 141 (20%) | 153 (26%) |
| Fpeak1 (N) | 1540 ± 297† | 1352 ± 145† | 855 ± 143† | −725 (−45%) | −188 (−12%) | −537 (−37%) | 545 (46%) | 445 (30%) | 396 (36%) |
| Fmin (N) | 1009 ± 144 | 1029 ± 117 | 700 ± 155† | −337 (−31%) | 28 (2%) | −365 (−32%) | 344 (41%) | 186 (18%) | 367 (43%) |
| Fpeak2 (N) | 1352 ± 160 | 1276 ± 119 | 910 ± 173† | −467 (−33%) | −70 (−6%) | −397 (−29%) | 272 (24%) | 259 (20%) | 316 (29%) |
| tFpeak1 (s) | 0.08 ± 0.03† | 0.104 ± 0.03† | 0.195 ± 0.03† | 0.12 (160%) | 0.03 (39%) | 0.09 (88%) | 0.06 (46%) | 0.03 (32%) | 0.06 (40%) |
| tFmin (s) | 0.31 ± 0.10 | 0.34 ± 0.10$ | 0.36 ± 0.06$ | 0.06 (15%) | 0.02 (8%) | 0.04 (6%) | 0.12 (36%) | 0.06 (19%) | 0.15 (44%) |
| tFpeak2 (s) | 0.53 ± 0.16 | 0.53 ± 0.16 | 0.59 ± 0.16† | 0.07 (12%) | 0.00 (1%) | 0.06 (12%) | 0.09 (16%) | 0.05 (9%) | 0.10 (18%) |
| Sideward Skating Jump | |||||||||
| GCT (s) | 0.80 ± 0.35† | 0.90 ± 0.35† | 0.94 ± 0.36† | 0.14 (18%) | 0.11 (13%) | 0.04 (4%) | 0.06 (8%) | 0.05 (7%) | 0.09 (11%) |
| Impulse (Ns) | 811 ± 269 | 832 ± 213 | 566 ± 181† | −228 (−30%) | 33 (3%) | −262 (−32%) | 217 (34%) | 161 (21%) | 143 (22%) |
| Fpeak1 (N) | 1843 ± 519† | 1505 ± 330† | 911 ± 146† | −1001 (−51%) | −357 (−18%) | −643 (−39%) | 886 (62%) | 691 (40%) | 508 (41%) |
| Fmin (N) | 986 ± 296 | 1040 ± 309 | 673 ± 194† | −332 (−32%) | 66 (6%) | −399 (−35%) | 320 (38%) | 186 (18%) | 364 (41%) |
| Fpeak2 (N) | 1384 ± 247 | 1392 ± 212 | 1004 ± 195† | −405 (−27%) | 13 (1%) | −419 (−28%) | 406 (35%) | 233 (17%) | 408 (35%) |
| tFpeak1 (s) | 0.09 ± 0.06† | 0.11 ± 0.06† | 0.21 ± 0.04† | 0.12 (128%) | 0.02 (24%) | 0.10 (84%) | 0.07 (49%) | 0.02 (25%) | 0.07 (44%) |
| tFmin (s) | 0.36 ± 0.26† | 0.40 ± 0.26† | 0.44 ± 0.25† | 0.08 (23%) | 0.04 (10%) | 0.04 (11%) | 0.12 (35%) | 0.08 (25%) | 0.11 (32%) |
| tFpeak2 (s) | 0.65 ± 0.38† | 0.66 ± 0.38† | 0.70 ± 0.36† | 0.06 (9%) | 0.02 (2%) | 0.04 (6%) | 0.06 (10%) | 0.03 (5%) | 0.06 (10%) |
| Single-Leg Diagonal Jump | |||||||||
| GCT (s) | 0.28 ± 0.04 | 0.38 ± 0.06$ | 0.39 ± 0.05$ | 0.10 (36%) | 0.10 (33%) | 0.00 (2%) | 0.04 (12%) | 0.07 (20%) | 0.09 (23%) |
| Impulse (Ns) | 402 ± 71 | 403 ± 56 | 2157 ± 34† | −141 (−36%) | 5 (0%) | −146 (−36%) | 116 (36%) | 77 (19%) | 93 (28%) |
| Fmax (N) | 2297 ± 360 | 2089 ± 169 | 1307 ± 170† | −1002 (−43%) | −201 (−9%) | −792 (−37%) | 693 (38%) | 694 (29%) | 430 (25%) |
| tFmax (s) | 0.11 ± 0.06 | 0.15 ± 0.03† | 0.17 ± 0.05† | 0.06 (52%) | 0.04 (31%) | 0.02 (15%) | 0.12 (94%) | 0.09 (73%) | 0.08 (52%) |
GCT, ground contact time; Fpeak1, first force peak during ground contact; Fmin, local force minima at approximately 50% of ground contact; Fpeak2, second force peak during ground contact; tFpeak1, time to first force peak; †significantly different to the other two methods; $different to AMTI force plate; ‡different to PedarX.