自製三軸測力板與商用測力板之效度評估暨發展力分解演算法

研究目的：本研究主要針對(1)自製測力板進行垂直地面反作用力的效度印證分析(2)發展可於一塊測力板之垂直地面反作用力，進行切割左右腳的方法，以突破以往測力板實驗的限制。方法：在排除影響本研究之相關因素，本研究總計共 13 位受測者(年齡 28.07±6.6 歲；身高 166.7±5.8 公分；體重 65±12.7 公斤)，進行資料收集。請受測者於商用測力板及自製測力板執行下蹲垂直立定跳及自然行走之步態動作，利用兩測力板量測之體重資料及下蹲垂直立定跳動作中之最大垂直地面作用力之數值及騰空飛行時間作為效度分析之參數；且利用在商用測力板之資料進行切割左右腳於垂直地面作用力方法之基礎及驗證，最後再將自製力板之資料進行切割法的進行，並與商用力板之測量值進行比較。結果：在下蹲垂直立定跳中，得到各參數之相關係數體重(r=0.99，p<0.01，絕對誤差為 0.09±0.9 公斤，相對誤差為 1±0.7%)、騰空時間(r=0.92，p<0.01，絕對誤差為 0.087±0.02 秒，相對誤差 0.045±0.08%)及最大地面作用力值(r=0.92，p<0.01，絕對誤差為 80.2±459.76 公斤，相對誤差為 0.62±13.37%)，在力切割法部分，相對誤差為 6.77 ±7.49%，在自製力板切割之左右腳垂直地面作用力與商用力板的交叉相關比較，在平均平移 4.92 個正規化單位，具有相關係數 0.98±0.01 的表現。結論：本文之自製測力板與商用測力板具高度相關，進一步進行切割法之發展，發現本自製測力板與商用測力板之左右腳資料在交叉分析，具有高度相關性。

關鍵字

測力板；效度；力切割法

並列摘要

Objective：(1) Make the validation of the novel designed tri-axis force plate on ground reaction force (GRF).(2) To develop a method to decomposes left and right GRF on the double stance during gait . (3)Decomposition the vertical GRF from the novel force plate and compare the left and right GRF with the force plate in motion lab. Methods：Using the force plate and novel force plate measured for 13 healthy participants .Each subject were asked to perform three times counter movement jumps and walked on two force platform. Acquire the GRF from counter movement jump calculated the parameter include body weight, flight time and the peak value of the vertical component to validation the novel designed tri-axis force plate . Decomposition of the vertical GRF and comparing the GRF computed and measured during gait from the motion force plate. Applying the algorithm to decomposition in novel force plate and verification it with the corresponding measured in motion. Result：The participants mean aged is 28.07±6.61 years (range from 22~45 years old), height 166.69±5.86 cm, weight 65±12.7 kg. The validity is analyzed by Spearman rank correlation coefficient, body weight (R=0.99, p <0.01), flight time(R=0.92, p <0.01), peak value of the vertical ground reaction force (R=0.91, p <0.01) , the mean relative error between the vertical GRF computed and the corresponding measured is 6.77±7.49%. Comparing the decomposing vertical GRF from novel force plate with the force plate in motion lab , the variations of cross correlation coefficients is 0.98±0.01. Conclusions：The novel designed tri-axis force plate had high correlated with force plate in lab. And develop a algorithm to decompose vertical GRF during normal gait pattern.

並列關鍵字

novel force plate ； ground reaction force ； force decompose

參考文獻

Anker, L.C., et al., The relation between postural stability and weight distribution in healthy subjects. Gait & Posture, 2008.27(3): p. 471-477.

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