若年成人の鍵ピンチ力，Ⅱ〜Ⅴ指の指腹ピンチ力の信頼性と臨床的判断

Reliability of key pinch strength and Ⅱ to Ⅴ fingers palmar pinch strength measurement and clinical interpretation in young adults

要旨：本研究の目的は，鍵ピンチ力，Ⅱ〜Ⅴ指の指腹ピンチ力測定値とその信頼性，ピンチ力の予測方法，測定値の臨床的判断基準を明らかにすることである．健常若年成人男女各15名を対象に3回測定を2日間に分け実施した．3回測定の平均値を用い，測定の信頼性，利き手・非利き手および握力やピンチ力間での相関，系統誤差の有無，Minimal Detectable Change（MDC）を検討した．日間信頼性はすべてのピンチ力測定で0.8以上となり再現性は高い．ピンチ力を予測する際，利き手・非利き手からの予測が最も信頼性が高く，利き手は非利き手の105〜110％を目安とする．鍵ピンチ力は測定値の13％，指腹ピンチ力は25％を真の変化とすることが有用と考える．

　The purpose of this study is to clarify the key pinch strength and II to V fingers palmar pinch strength, the reliability of pinch strength measurement, the prediction method of pinch strength, and the clinical interpretation of the measured value. Measurements were performed 3 times over 2 days on 15 healthy young male and female adults. The correlation between dominant and non-dominant hand strength, grip strength, pinch strength, presence or absence of systematic error, and Minimal Detectable Change (MDC) were examined using the average value of three measurements. The Day-to-day Reliability was greater than 0.8 for all the pinch strength measurements, which was highly reproducible. When predicting the pinch strength, the predicting the dominant and non-dominant hands is the most reliable, while the dominant hand is 105〜110% more predictable than the non-dominant hand. It is useful to use a key pinch strength of 13% and palmar pinch strength of 25% of the measured value as the true changes.