Isometric knee muscle strength measurement using a belt-stabilized hand-helddynamometer and an isokinetic dynamometer with and without trunk fixation: investigationof agreement of measurement values and factors influencing measurement

摘要

[Purpose] The purpose of this study was to examine the agreement between the valuesobtained by using a hand-held dynamometer with a belt (belt-HHD) and an isokineticdynamometer (IKD) for the measurement of isometric knee flexion and extension musclestrength. We also studied the factors influencing the measurement. [Participants andMethods] Overall, 26 healthy young adults (16 males, 10 females) participated in thestudy; the mean age was 21 years. Knee flexion and extension muscle strength were measuredby three methods: 1) belt-HHD, 2) conventional IKD with the participant sitting on anattached chair (conv-IKD), and 3) modified IKD with the participant sitting on the samemat table as HHD (mod-IKD). [Results] In the measurement of knee extension, mod-IKD andconv-IKD showed a fixed bias and a proportional bias, conv-IKD and belt-HHD showed a fixedbias, and belt-HHD and mod-IKD showed a fixed bias. In the measurement knee flexion,conv-IKD and mod-IKD showed a proportional bias, belt-HHD and conv-IDK showed a fixedbias, and mod-IKD and belt-HHD showed a fixed bias. In each combination, the measuredvalues were larger in the latter due to errors. However, the types and values of errorsdiffered when analysis was conducted based on gender. [Conclusion] In order to increasethe agreement between the values, it is necessary to revise the fixing method of thetrunk, and the fixing method of the belt and the sensor pad in belt-HHD.