Table 2.
Comparison of kinetic and kinematic variables during the two vertical jumps, counter movement jump (CMJ) and drop jump (DJ) 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 | |
| Weight (N) | 773 ± 113 | 771 ± 109 | 616 ± 139† | −155 (−20%) | 10 (0%) | −165 (−20%) | 174 (25%) | 191 (25%) | 234 (33%) |
| Impulse CMJ (Ns) | 941 ± 180 | 1013 ± 165$ | 821 ± 148† | −114 (−13%) | 83 (8%) | −197 (−19%) | 195 (22%) | 197 (20%) | 210 (23%) |
| Fmax CMJ (N) | 1726 ± 252 | 1880 ± 224$ | 1414 ± 271† | −303 (−18%) | 170 (9%) | −473 (−25%) | 308 (20%) | 350 (19%) | 327 (20%) |
| Time to Fmax CMJ (s) | 0.72 ± 0.21 | 0.71 ± 0.19 | 0.74 ± 0.21 | 0.01 (3%) | −0.01 (0%) | 0.02 (4%) | 0.16 (23%) | 0.09 (13%) | 0.14 (19%) |
| Flight time CMJ (s) | 0.53 ± 0.07 | 0.49 ± 0.10$ | 0.53 ± 0.07‡ | 0.01 (1%) | −0.04 (−6%) | 0.04 (8%) | 0.03 (6%) | 0.10 (20%) | 0.10 (17%) |
| Fmax landing CMJ (N) | 4394 ± 1104 | 3047 ± 473$ | 1379 ± 200† | −3023 (−69%) | −1347 (−31%) | −1676 (−55%) | 2086 (72%) | 2272 (61%) | 838 (37%) |
| Impulse DJ (Ns) | 522 ± 111 | 553 ± 99 | 392 ± 79† | −126 (−25%) | 36 (6%) | −162 (−29%) | 147 (32%) | 123 (23%) | 122 (26%) |
| Fmax DJ (N) | 4667 ± 1002 | 3918 ± 678$ | 1897 ± 285† | −2678 (−59%) | −730 (−16%) | −1948 (−52%) | 1845 (57%) | 1414 (34%) | 1250 (44%) |
| Time to Fmax DJ (s) | 0.06 ± 0.02 | 0.08 ± 0.02$ | 0.17 ± 0.03† | 0.11 (176%) | 0.02 (38%) | 0.08 (100%) | 0.04 (36%) | 0.03 (39%) | 0.04 (36%) |
| GCT DJ (s) | 0.22 ± 0.05 | 0.25 ± 0.05 | 0.22 ± 0.05‡ | −0.01 (−2%) | 0.02 (10%) | −0.03 (−11%) | 0.02 (7%) | 0.03 (13%) | 0.03 (13%) |
| Flight time DJ (s) | 0.49 ± 0.07 | 0.47 ± 0.08 | 0.50 ± 0.07‡ | 0.00 (1%) | −0–03 (−5%) | 0.03 (7%) | 0.02 (4%) | 0.05 (9%) | 0.04 (9%) |
CMJ, counter movement jump; Fmax, maximal force; DJ, drop jump; GCT, ground contact time; †significantly different to the other two methods; $different to AMTI force plate; ‡different to PedarX.