| The purpose of this study was to measure relative electromyographic activity of the quadriceps femoris, hamstrings, and the gluteus maximus during performance of the leg press exercise on the SX1. Ten volunteers participated in the study. The quadriceps, hamstrings, and gluteus maximus were studied using surface electrodes. Each participant performed a maximal voluntary isometric contraction of each muscle with the hip and knee in a position of 90 degrees of flexion. This was considered the acceptable maximum recruitment level for the tested muscle. The participants then performed three leg press repetitions on the SX1 at a resistance equal to their body weight. Results revealed that the vastus medialis had the highest relative activity in 90% of the participants for the concentric contraction for Trial 1. For Trial 2, the BF had the highest relative activity in 5 participants and the GM in 3 participants. |
