Lower-limb power
The Quattro Jump System (Kistler 9290AD, Switzerland) was used to assess the lower-limb power. Maximal vertical jump height was recorded to the nearest 0.1 cm after performed a counter movement jump (CMJ) without swinging the arm from the force plate. Specifically, children stood straight on the portable force plate with their hands on both sides of the hip joint as the initial position, and, after hearing the “start” cue from the instructor, they squatted down to a 90°knee angle position and jumped straight as high as possible, with a rapid, preparatory downward eccentric action while keeping hands on the hip joint. As suggested by a previous study [