Relationship between two-leg standing two-step back jump and knee flexion and extension muscles

Abstract

Physical strength tests such as grip strength and jumping stand are performed to evaluate the muscle mass and strength of the whole body to lead a healthy life. Quantitative evaluation is required, for example, the ratio of flexion strength to extension strength (HQ ratio) of the knee joint is pointed out to be related to the flesh of the lower limb. It has been pointed out that knee extension muscle strength is related to standing broad jump and the whole body muscle mass, but there are very few measurement methods that can easily estimate knee flexion muscle strength. Therefore, in this study, we decided to develop a method to estimate the flexion strength of the knee. Taking into account the standing backward double jump, we set various jump conditions as a cross-sectional study and examined the relationship with each muscle strength of the lower limbs.