Tricep
The antagonist to the Triceps are the biceps-brachii
Latissimus Dorsi
The triceps lengthens when the biceps contracts, making the triceps the antagonist.
Incorporating grip curl dumbbell exercises into your workout routine can help strengthen your forearm muscles, improve grip strength, and enhance overall arm muscle development.
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The primary agonist muscle in a lateral dumbbell raise is the deltoid, specifically the lateral (side) head of the deltoid. The antagonist muscle is the latissimus dorsi, which performs the opposite movement by extending the shoulder while the deltoid is lifting the dumbbell.
A concentric movement would be flexing the elbow and curling a dumbbell towards the shoulder, an eccentric contraction would be the opposite movement ie bringing the dumbbell back down towards the thigh.
The opposite of an antagonist muscle is a protagonist muscle, often referred to as an agonist. The agonist muscle is the primary muscle responsible for performing a specific movement, while the antagonist muscle opposes that movement. For example, during a bicep curl, the biceps act as the agonist, and the triceps serve as the antagonist.
With elbows to sides, raise one dumbbell until forearm is vertical and thumb faces shoulder. Lower to original position and repeat with alternative arm.
As of my last knowledge update in October 2023, the world record for the dumbbell curl is held by a number of athletes, with the weights varying by class and competition rules. The heaviest verified dumbbell curl was performed with a weight of 175 pounds (79.4 kg) by professional bodybuilder and powerlifter Ronnie Coleman. Records can change frequently, so it’s advisable to check the latest updates from reputable sources for the most current information.
The agonist (not angonist) muscle are the Biceps Brachii and the Brachioradialis and the antagonist is the Triceps Brachii.
The antagonist muscle used in a leg curl is the quadriceps, located at the front of the thigh. During a leg curl, the hamstrings contract to flex the knee, while the quadriceps must relax and lengthen to allow this movement. This reciprocal inhibition helps facilitate smooth and controlled leg movements.