In Experiment 2, the rectus femoris activation was significantly higher during knee extension than during leg press, whereas no differences were observed in the vasti. The addition of isometric hip extension torque significantly decreased rectus femoris activation (Experiment 1). Muscle activation during exercises was measured using surface electromyography from the rectus femoris, vastus lateralis and medialis. ![]() In Experiment 2, 15 men performed knee extension and leg press separately at intensities of 20, 40, 60 and 80 % of their one repetition maximum (1RM) load, and 14 men conducted leg press at intensities of 40 and 80 % of 1RM until exhaustion (Experiment 3). This study aimed to examine whether muscle activation of the quadriceps femoris differs between single- and multi-joint exercises, and to explore the factors resulting in muscle and exercise specificity in activation.Įleven adults developed isometric hip extension torque gradually while maintaining submaximal isometric knee extension torque (Experiment 1).
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