2022 Volume 2 Pages 1-8
Objective: This study was performed to investigate the effects of the skeletal muscle index (SMI) of the whole body and lower limbs (as estimated by bioelectrical impedance analysis using an body composition meter) and the quadriceps muscle thickness and echo intensity (as measured by an ultrasound imaging system that can be easily used in clinical practice) on the knee extensor strength in healthy young adults.
Methods: The SMI of the whole body and lower limbs, the muscle thickness and echo intensity of each quadriceps muscle, and the knee extensor strength were measured in 120 legs of 60 healthy young adults.
Results: A significant relationship was found between the knee extensor strength and SMI of the whole body and lower limbs and between the knee extensor strength and the muscle thickness and echo intensity of each quadriceps muscle. Multiple regression analysis suggested that the SMI of the lower limbs, muscle thickness of the vastus medialis, and sex affected the knee extensor strength.
Conclusion: Multiple regression analysis suggested that the SMI of the lower limbs, muscle thickness of the vastus medialis, and sex can be used to estimate the knee extensor strength in healthy young adults.
