What type of contraction does the tricep muscle undergo during the up phase of a wide arm push-up?

During the up phase of a wide arm push-up, the tricep muscle undergoes a concentric contraction. This type of contraction occurs when a muscle shortens while generating force, allowing for movement against resistance. In the case of a push-up, as you push your body away from the ground, the triceps work to extend the elbow joint, effectively straightening the arm. This action requires the muscle fibers to contract and shorten to lift and move the body upward. Understanding this movement pattern is key in kinesiology, as it illustrates how muscles function during specific exercises to produce movement.