TABLE 2.
Paired sample t-test loaded verses acute unloaded.
| Loaded (upright) Mean (95% CI) | Acute unloaded (supine) Mean (95% CI) | t | Sig | ||
| AMEDA (AUC) | Ankle | 0.68(0.66,0.69) | 0.66(0.64,0.67) | 2.054 | 0.045 |
| Finger | 0.77(0.75,0.78) | 0.79(0.78,0.80) | –2.86 | 0.006 | |
| KD infrared eye tracking test | Completion time (s) | 48.1(46.0,50.2) | 48.5(45.9,51.0) | –0.708 | 0.482 |
| Saccade velocity (deg/s) | 183.4(175.3,191.6) | 198.5(192.4,204.63) | –4.87 | < 0.001 | |
| Fixation time (ms) | 257.1(239.2,275.0) | 287.2(269.1,305.2) | –3.019 | 0.004 | |
| Muscle contraction time (s) | Duration | 1.37(1.17,1.55) | 2.78(2.40,3.14) | –8.323 | < 0.001 |
| Peak activity (%) | Tibialis Anterior | 54(48,59) | 20(16,23) | 10.364 | < 0.001 |
| Peroneus Longus | 55(50,60) | 28(23,32) | 8.356 | < 0.001 | |
| Gastrocnemius | 61(55,67) | 19(15,23) | 12.983 | < 0.001 | |
| IEMG (%) | Tibialis Anterior | 25(20,30) | 43(31,55) | –2.828 | 0.007 |
| Peroneus Longus | 24(19,29) | 37(32,42) | –1.854 | 0.001 | |
| Gastrocnemius | 29(24,34) | 36(31,41) | –2.151 | 0.04 |
Results of the Ankle AMEDA AUC score, Finger AMEDA AUC score, KD infrared eye tracking test completion time (seconds), KD infrared eye tracking test mean saccade velocity (degrees/seconds), KD infrared eye tracking test mean fixation time (milliseconds), mean muscle contraction duration (seconds), and peak muscle activity and total muscle activity (IEMG) as a percentage (%) of peak normalization for tibialis anterior, peroneus longus and gastrocnemius were compared among upright and supine. The significance (Sig) level was set at 0.05. Mean and 95% confidence interval (CI) provided for each category. Results show no significant difference between body posture for KD infrared eye tracking tests completion time. All other comparisons were significant, where ankle AMEDA AUC score was greater in loaded, finger AMEDA AUC score greater in acute unloaded, KD infrared eye tracking test mean saccade velocity and fixation time greater in acute unloaded, peak activity greater in loaded, IEMG and muscle contraction time greater in acute unloaded.