Influence of Testing Position on the Reliability of Hip Extensor Strength Measured by a Handheld Dynamometer

功能性活動表現與髖關節伸展肌(extensor)肌力的表現相關密切，傳統以手握式肌力測試計(handheld dynamometer)在俯臥(prone)姿勢下測量髖關節伸展肌力，但研究發現測量結果信度不佳。因此本研究目的嘗試以不同擺位姿勢，比較髖關節伸展肌之測量信度。47位及16位正常受試者分別接受髖關節伸展肌力測試之施測者內信度(intrasession reliability)與施測者間信度(interrater reliability)分析，測試方法採壓倒性測試(break test)，受試者接受俯臥姿勢(prone position、PP)及俯臥站立姿勢(prone standing position、PSP)測試。結果方面以組內相關係數(intraclass correlation coefficient、ICC)數值表示相對信度，測試內信度在PP(ICC(下标 1,3)=0.92) 和在 PSP (ICC(下标 1,3)=0.94)下測試信度皆高，但施測者間信度只有在PSP (ICC(下标 2,3)=0.92)下測試信度高，而在PP(ICC(下标 2,3)=0.65)下測試信度偏低。絕對信度方面，最小真正改變值(smallest real difference)數值代表單一個案之測量誤差，在PSP(29.8)下測試均小於在PP(71.8)下測試。臨床上建議髖關節伸展肌力的測量應使用PSP測量，以PSP測試可有效改善以PP測量時施測者間信度不佳的問題。

關鍵字

髖關節伸展；擺位姿勢；信度

並列摘要

Hip extensors belong to an important muscle group that controls standing, walking and other functional activities. The prone position (PP) is commonly used to measure the strength of the hip extensors; however, the reliability of such measurements is poor. The aim of this study was to determine the effect of different testing positions, that is, the PP and the prone standing position (PSP), on the reliability of measurements of hip extensor strength. Intrasession reliability and interrater reliability studies were performed on 47 and 16 normal subjects, respectively. The muscle strength of the hip extensors was tested in both the PP and PSP. A handheld dynamometer and break test were used to measure the strength. Relative reliability and absolute reliability were assessed in both PP and PSP. For relative reliability, the intraclass correlation coefficient (ICC) was used to examine the level of reproducibility among measurements. Absolute reliability, the smallest real difference (SRD), was used to provide information on measurement error. The results showed that the reliability was better in PSP than in PP. For relative reliability, the values of ICCs were excellent in the intrasession reliability study, in both PP (ICC(subscript 1,3)=0.92) and PSP (ICC(subscript 1,3)=0.94). However, the interrater reliability was only excellent in PSP; the ICC(subscript 2,3) were 0.92 in PSP and 0.65 in PP. For absolute reliability, the values of the SRD were much lower in PSP (29.8) than in PP (71.8), indicating that the measurement of muscle strength in PSP was more stable and had smaller measurement error than in PP. Changing the testing position from the traditional ”prone” to ”pronestanding” effectively improved both the relative reliability and the absolute reliability.

並列關鍵字

hip extension ； positions ； reliability

國際替代計量

Influence of Testing Position on the Reliability of Hip Extensor Strength Measured by a Handheld Dynamometer

未授權

主題瀏覽