Frequent question: What muscle group is worked concentrically in the leg extension?

What muscles cause leg extension?

A leg extension, also known as a knee extension, is an isolation exercise focused on the quadriceps, which are made up of four specific muscles on the front of your thigh—the rectus femoris, vastus lateralis, vastus medialis, and vastus intermedius.

Can extensions be concentric?

concentric: (Of a motion), in the direction of contraction of a muscle. (E.g., extension of the lower arm via the elbow joint while contracting the triceps and other elbow extensor muscles. eccentric: Against or in the opposite direction of contraction of a muscle.

What body parts does leg extension work?

The exercise works mainly the quadriceps muscles of the front of the thigh—the rectus femoris and the vastus muscles. You can use this exercise to build lower body strength and muscle definition as part of a strength training workout.

Is extension of the shoulder an eccentric?

The eccentric strength of the shoulder rotator muscles averaged 114% that of concentric strength. The concentric and eccentric elbow extension-to-flexion strength ratios ranged from 71% to 110%; eccentric strength averaged 33% higher than concentric strength.

What is the agonist muscle in a leg extension?

The hamstrings are the agonist and the quadriceps are the antagonist. In the contact and recovery phase, the quadriceps contract to extend the knee while the hamstrings lengthen to allow the movement.

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What is the concentric phase of a leg extension?

The concentric phase is the ‘work’ or ‘effort’ phase.

Do leg curls and extensions work?

Leg extensions primarily work the quadriceps muscles. This is the muscle found at the front of your thigh. If you’re looking to increase size in your quads, or want to define that “teardrop” section, leg extensions are your go-to exercise. Conversely, leg curls work the hamstring muscles.

What is the primary muscle muscle group being worked during a lateral raise?

The primary muscle worked in the Lateral Raise exercise is the medial or middle deltoid. This is achieved by lifting the arms to the sides. Lifting the arms to different directions will change the target muscles. For example – lifting the arms to the front will primarily work the anterior deltoids.