The Correlation Between Tri-axial Accelerometer And Force Plate During Landing In Young Female

Abstract

Uni-axial accelerometer had been used to record the tibia impact acceleration in the previous studies. But the correlation between tri-axial accelerometer (TA) and force plate during landing was unclear. PURPOSE: To determine the relationship between TA and force plate during landing in young female. METHODS: Female volunteers were recruited in the study. After warm up (YMCA cycling protocol), subject was asked to practice drop jump from the step and landed with both legs on force plate with the fixed hands position. Three TA were attached at the greater trochanter (HTA), tibial head (KTA) and 5 cm above lateral malleolus (ATA). All accelerometers were aligned closely to the anatomical axes (anteriorposterior, AP; mediolateral, ML; vertical, VT). Range value of accelerometer and GRF were determined by difference between maximum and minimum values. All sampling rate was 200 Hz, synchronized by trigger. Pearson correlation coefficient was used to examine the correlation (p < 0.05). RESULTS: Fourteen female (age: 22.1 ± 2.7 yrs; height: 1.6 ± 0.1 m; weight: 56.2 ± 8.1 kg; warm up heart rate: 129.6 ± 16.7 bpm) finished all trial. The correlation between KTA in AP, LM, VT and GRF were 0.68, 0.74 and 0.72 (all p <.05), and between ATA in VT and GRF was 0.76 (p <.05). However, the correlations between HTA and GRF were not statistically significant in all axes (p >.05). CONCLUSIONS: These results indicated that the KTA has medium-high correlation with force plate in all three directions in young female during landing. And the ATA demonstrated medium-high correlation with force place in the VT, too. TA provided more information than uni-axial one and could be an useful tool in assessment of landing process. Supported by NSC 96-2413-H-179-008.Table