Relationship between the Power Index of Sit-to-Stand and Knee Extensor Strength

Abstract

[Purpose] The purpose of this study was to clarify the relationship between time and power indicators of the 10-repetition sit-to-stand test and the muscle function of the knee extensor muscles in healthy adults. [Participants and Methods] The study subjects were 105 healthy adults (53 males, 52 females). The time and power indexes were calculated from the results of the 10-repetition sit-to-stand test and were compared with the maximum torque and average power during isokinetic exercise measured using a Biodex as a measure of knee extensor muscle strength. [Results] The power index was significantly highly correlated with the maximum torque and average power at all angular velocities for all subjects. [Conclusion] We believe that the power index can be used to evaluate muscle function in knee extensors regardless of age, and that it has the potential to be a useful evaluation index for reflecting declines in muscle function and ADL due to aging.