目的：近年來坐站測試被認為是可用來代表老年人下肢肌力的功能性評估檢測，但它是否適用於所有的老年族群則需進一步證實。本研究旨在探討台灣地區不同健康狀況社區居住老年人下肢膝伸直肌力和三十秒坐站測試之间的關係。方法：本研究為一橫斷面研究，共收取202位社區居住老年人（平均年齡76.16±6.11歲），其中90位為居住於長庚養生文化村居民（平均年齡78.31±5.25歲），另外112位為林口長庚一般內科門診的社區居住老年人（平均年齡74.57±6.22歲）。所有受測者皆進行三十秒坐站測試及以MicroFET3手握式測力計測量下肢膝伸直肌力。將所有受試者依有無慢性疾病分組，以曼一惠特尼檢定進行分析二組描述性統計值之差異，再按不同性別，排除年齡、體重及規律運動的有無等影響因素進行二個因素间的偏相關分析。結果：無慢性疾病組的體重顯著低於有慢性疾病組（58.48±8.99公斤vs. 61.86±10.51公斤, P<05），而無一劉生疾病組的女性在三十秒坐站測試次數顯著高於有慢性疾病組(12.71±4.78 vs. 11.38±4.29, p<05)。在相關性方面，有慢性疾病組男女性下肢膝伸直肌力和三十秒坐站測試呈現顯著中和低度正相關（男r=.49; 女r=.33, p<001）；而在無疾病組女性則呈現顯著低度正相關(r=.32, p<.05)，但在男性則無顯著相關(r=.25, p=.14)。結論：老年人下肢膝伸直肌力和三十秒坐站測試之间的相關性會因性別和健康狀態不同而有所差異，其相關性只在一般有慢性疾病，健康、體能狀況較普通的老人族群較顯著，所以對於健康狀況較佳的老年人，此測試的選用需多加考量，建議可加入其他測試的指標作為評估功能性下肢肌力的參考依據。

Purpose: The purpose of this study was to investigate the relationship between knee extensor muscle strength (KE) and the 30-sec chair stand test (30-sec CST) of the elderly with different general health status and living in different communities in Northern Taiwan. Methods: In this cross-sectional study, we recruited 202 older adults. Among them, ninety subjects (mean age=78.31±5.25) were from a well-supervised and serviced retirement community, where a rigorous health screen for each older adult was carried out before they can move in, and 112 subjects (mean age=74.57±6.22) were from an internal medicine clinic in the CGMH, Linkou, Taiwan. The 30-sec CST and the knee extensor muscle strength measured by the MicroFET3 handheld dynamometer were tested for all of the older adults. All of the older adults were grouped into 2 groups according to chronic disease status for statistical analyses. Descriptive statistics of variables of the two groups were provided and the differences between groups were tested by the Mann-Whitney test. The relationship of the 30-sec CST and the knee extensor muscle strength was analyzed by partial correlation coefficience adjusted by age, weight and regular exercise status. Results: The results showed average body weight of elderly without chronic disease was significantly lower than that with chronic disease (58.48±8.99 vs. 61.86±10.51, p<.05). Female without chronic disease significantly outperformed those with chronic disease in the 30-sec CST(12.71±4.78 vs. 11.38±4.29, p<.05). There were significantly positive correlation of the 30-sec CST and the KE in both sex of the elderly with chronic disease(male r=.49; female r=.33, p<.001) and the female without chronic disease (r=.32, p<.05), but not in the male without chronic disease (r=.25, p=.14). Conclusion: The 30-sec CST was widely used to represent lower extremities muscle strength and endurance in the elderly fitness test. However, the 30-sec CST correlated well with KE only in the elderly with average health status, but not in those in the upper end of health status. Using the 30-sec CST to represent muscle strength in the fitness test for the healthier elderly should be with caution. (FJPT 2008;33(5):287-293)