Table 1 Three-Dimensional spinal manipulation load characteristics
| Â | Both Chiropractors (N = 14) | Chiropractor 1 (N = 6) | Chiropractor 2 (N = 8) | |||
|---|---|---|---|---|---|---|
Fx (N) | Mean | SD | Mean | SD | Mean | SD |
Preload | 14.6 | 7.1 | 19.4 | 4.9 | 11.1 | 6.5 |
Peak load | 25.3 | 37.5 | 61.8 | 26.2 | -2.1 | 10.6 |
Fy (N) | Â | Â | Â | Â | Â | Â |
Preload | 4.8 | 9.3 | 7.4 | 9.2 | 2.8 | 9.5 |
Peak load | -20.6 | 40.2 | -40.4 | 51.7 | -5.8 | 22.4 |
Fz (N) | Â | Â | Â | Â | Â | Â |
Preload | 96.4 | 30.7 | 71.5 | 22.8 | 115.1 | 21.0 |
Peak load | 335.3 | 71.3 | 382.2 | 37.7 | 300.1 | 71.5 |
FRes (N) | Â | Â | Â | Â | Â | Â |
Preload | 98.7 | 29.3 | 75.5 | 20.9 | 116.1 | 21.7 |
Peak load | 340.3 | 75.2 | 392.6 | 41.0 | 301.0 | 72.0 |
Preload duration (ms) | 1966 | 1022 | 2976 | 524 | 1209 | 462 |
Thrust loading Duration(ms) | 164 | 37 | 144 | 26 | 179 | 39 |
Thrust unloading duration(ms) | 746 | 316 | 1046 | 211 | 521 | 134 |
Total duration(ms) | 2876 | 1240 | 4166 | 422 | 1909 | 482 |
Rateof Fz thrust loading(N/s) | 1577.9 | 733.8 | 2226.3 | 452.6 | 1091.6 | 472.3 |
Rate of Fz thrust unloading(N/s) | -517.4 | 203.6 | -384.5 | 119.9 | -617.1 | 200.6 |
Rateof FRes thrust loading(N/s) | 1595.1 | 749.8 | 2267.3 | 442.7 | 1090.9 | 475.7 |
Rate of FRes thrust unloading(N/s) | -522.7 | 201.9 | -394.5 | 121.3 | -618.8 | 201.4 |