Analysis of the Characteristics of Pressure-time Curve under Peak Metatarsal Plantar Pressure Site of Healthy Adults

正常人蹠骨尖峰壓力區之壓力時間曲線分析

康峻宏(Jiunn-Horng Kang) ； 陳適卿(Shih-Ching Chen) ； 賴金鑫(Jin-Shin Lai) ； 施偉立(Wei-Li Hsi)

《台灣復健醫學雜誌》 34卷4期 (2006/12) Pp. 209-214

https://doi.org/10.6315/2006.34(4)02

摘要

足底壓力測量是研究足部問題的良好工具，能對臨床處理足部病變提供進一步關於診斷、治療及預後的資訊。本研究主要在分析正常行走下，尖峰蹠骨壓力區下的壓力一時間變化曲線。
本研究總計測量30名未有足部問題的健康成年人，男性及女性各15人，平均年齡為24.8歲。採用第一步方式，利用高解析度的壓力感測鞋墊量測前足區之壓力變化。分析前足區之壓力，針對蹠骨區最高峰值壓力區進行時間變化的分析，並對於壓力—時間變化曲線建立最小平方殘差的近似曲線。我們發現所有受試者的壓力—時間曲線型態上都十分相似，曲線為一漸增曲線並可觀察到有兩種不同斜率的上升部份。最小平方殘差之近似曲線為三次方曲線︰P(t)=α×t^3+β×t^2+γ×t+δ，四個係數的平均值(範圍值)依次為：13491±8214 (3437 to 28785)，-9005±5643(-2745 to -22415)，2414±1496(1067 to 5430)，2400±1102 (1305 to 3865) (P(t)單位為kPa，t的單位為秒)。各項係數與體重、身高、統計上的相關性並不明顯。我們認為，行走時在尖峰蹠骨壓力區下的壓力—時間曲線具有一定的特徵性，本研究提供健康年輕人行走時蹠骨壓力峰值區的壓力－時間曲線近似曲線的係數常模值，分析曲線型態的變化及近似曲線的性質可能是進一步評估足部疾病的工具。

關鍵字

蹠骨 ； 足底壓力 ； 壓力－時間曲線

並列摘要

The purpose of this study was to describe the characteristics of the pressure-time curve under the peak metatarsal pressure site during walking. Plantar pressures were measured at the forefoot area of 30 healthy adults during walking using high resolution transducers with the first step method. The pressure data at each time frame under the peak metatarsal pressure site were extracted and analyzed. A mathematic model was calculated to approximate this curve with the least square residual. The patterns of pressure-time curves under the peak metatarsal pressure sites were very similar in all subjects. After forefoot contact, it was an increasing curve which had two different components with different slopes. The approximate model of the pressure-time curve with least square residual at peak pressure site was the cubic equation which can be expressed as P(t)=α(superscript *)t^3+β(superscript *)t^2+γ(superscript *)t+δ. The means of coefficients of approximate function α was 13491±8214, β was -9005±5643, γ was 2414±1496, and δ was 2400±1102 (the unit of P(t) is kPa, and t is second). The correlations between weight, height and each coefficient (α, β, and γ) were statistically insignificant. Further study in the correlation between pathological conditions and changes of the pressure-time curves should be conducted.

並列關鍵字

metatarsal bones ； plantar pressure ； pressure-time curve