Comparison of head acceleration events (HAE), in the iMG and CG frame of references for each direction of head motion
| Head motion direction | HAE count | PAA (rad/s2) | PLAiMG (g) | PLACG (g) | Agreement | RMSD (g) | NRMS (%) | ||||||
| Median | IQR | Median | IQR | Median | IQR | LCCC | 95% CI | Median | Range | Median | Range | ||
| Head backwards | N=56 | 1388.85 | (1520.25) | 14.86 | (8.68) | 19.93 | (16.72) | 0.65 | (0.5 to 0.76) | 2.21 | (6.22) | 13.14 | (36.12) |
| Head forwards | N=64 | 1058.31 | (917.86) | 15.25 | (13.97) | 15.31 | (8.25) | 0.69 | (0.53 to 0.79) | 2.36 | (6.28) | 15.51 | (43.75) |
| Tilt left | N=267 | 1188.67 | (910.35) | 15.29 | (10.39) | 17.40 | (10.81) | 0.76 | (0.71 to 0.81) | 2.30 | (17.75) | 12.78 | (46.25) |
| Tilt right | N=219 | 1267.51 | (994.38) | 16.00 | (10.5) | 17.73 | (11.28) | 0.73 | (0.66 to 0.78) | 2.47 | (36.03) | 13.39 | (51.34) |
| Turn left | N=112 | 957.05 | (873.71) | 17.04 | (11.58) | 16.30 | (9.27) | 0.67 | (0.55 to 0.76) | 2.22 | (16.03) | 12.16 | (43.52) |
| Turn right | N=107 | 1214.13 | (880.50) | 16.27 | (12.05) | 16.61 | (10.38) | 0.76 | (0.68 to 0.83) | 2.23 | (10.15) | 13.29 | (30.47) |
Bold values indicate movement directions that were significantly different between frames of reference (p<0.05).
CG, center of gravity; iMG, instrumented mouthguard; LCCC, Lin’s concordance correlation coefficients; NRMS, RMS was normalised; PAA, peak angular acceleration; PLA, peak linear acceleration; RMSD, root mean square deviation.