老人跌倒的盛行率極高，且影響其健康及獨立生活極大，平衡能力較差為造成老
人跌倒的主要因素之一，對平衡控制的退化及如何量化平衡狀態是許多學者與醫護人員希望了解的主題。有越來越多學者以動量研究平衡，但利用動量探討老人穩定限度研究仍付諸闕如，吾人有必要針對此參數詳加研究。本研究目的有三:(一)前傾動作時，老人與年輕人於不同支撐底面積下，重心線動量是否顯著不同。(二)在不同的支撐底面積下，老人與年輕人在前傾動作中，重心角動量是否顯著不同。(三)重心線動量及重心角動量與壓力中心穩定限度參數及重心穩定限度參數間的相關性為何。本研究受試者為十名社區老人(年齡: 70.4 士3.6 歲，身高: 158.9 士7.6 公分，體重: 60.4 士7.8 公斤)及十名年輕人(年齡:25.6 士3.4 歲，身高:167.7 士8.6 公分，體重: 55.8 士8.1 公斤)，男女各半。受試者站立於測力板(AMTI, 600Hz)上，隨機進行自然站立與雙腳併攏的前傾動作十次。並以五台紅外線攝影機(VICON, 120Hz)同步紀錄受試者之動作，利用所得之資料，以LabVIEW 6.1 版軟體撰寫程式計算重心線動量與角動量，並以SPSS 軟體進行混合設計二因子變異數分析及Pearson’s 積差相關考驗(α=.05)。本研究結果：(一) 前傾的動態平衡能力上，老人與年輕人於不同支撐底面積下，重心線動量顯著不同。(二) 在不同的支撐底面積下，老人與年輕人在前傾動作中，重心角動量亦顯著不同。(三)重心線動量及重心角動量與壓力中心及重心極限參數顯著相關。在未來相關動態極限的研究，可利用動量此參數做深入探討，此外，本研究亦可作為老人平衡訓練之參考。

There is high prevalence for the elderly falling and it would affect their
health and independent activities very much. The poor balance is one of the reasons for the elderly falling. Many researchers and clinicians are very much concern about the mechanism of the balance system and how to use the knowledge with respect to the mechanism to improve patients’performance of balance. There are more and more studies related to the momentum for analyzing the performance of balance, however, referred the momentum of center of mass to limit of stability for elderly are still not much to be found.There were three purposes for this study. First, to determine whether the linear momentum of the center of mass significant different between the elderly and the young people or not for forward leaning in two different base of support. Second, to determine whether the angular momentum of the center of mass significant different between the elderly and the young people or not for forward
leaning in two different base of support. Third, to determine the relationship between the linear momentum and the angular momentum of the center of mass, and the parameters for the limit of stability.
The subjects were 10 elderly and 10 young healthy persons. They were asked to standing on the AMTI force plate (600Hz), then measurements were taken repeatedly for forward leaning in natural stance and in Romberg stance randomly, with a short break of 10 minutes between sessions. Five ultrahigh resolution infrared cameras (VICON, 120Hz) were synchronized to collect the 3-D data. Linear momentum and angular momentum were calculated by
LabVIEW 6.1. GLM for repeated measurement and the Pearson product moment correlation were obtained by SPSS 10.0 for window to test the selected variables at .05 significant level.
We concluded that the linear momentum of the center of mass were
significantly different between the elderly and the young people for forward leaning in two different base of support. For forward leaning in two different support base, the angular momentum of the center of mass were significantly different between the elderly and the young people. And there were significant relationship between the linear momentum and the angular momentum of the center of mass, and the parameters for the limit of stability. The linear momentum and angular momentum of the center of mass would be provided as
good parameters to analyze the limit of stability for the elderly forward leaning.

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