Small Contraction Of The Biceps Muscle example essay topic

There are many different apparatus that can be used when doing bicep curls such as bicep curls machines, multipurpose machines dumbbells or barbells. Free weights are said to be better because they take the muscle thought a natural range of movement. I would say that the use of dumbbells for the biceps curl is the best because it allows you to carry out one-arm curls, which allows each arm to be worked to it's full potential. It can also be done standing or seated. The preacher curl bench allows you to isolate the muscles used during the biceps curl and also eliminate elbow stress. By using a preacher curl bench the trunk is more stable which provides a good base.

During the exercise the resistance is greatest at full extension and decreases as the arm is flexed. Below shows a preacher curl bench: The picture below shows how to do the seated alternating dumbbell bicep curl. Start Finish Description The common name is Biceps, the scientific name is Biceps brachii these are located on the Body in the front of the arms. The short or medial head attaches to the coracoid process of the scapula; the long or lateral head attaches to the glenoid. Both run to a tendon that travels between the radius and ulna attaching medially. The motion performed is flexion, when you bend your arm to pick something up, you use your biceps.

Flexes elbow joint and supinates forearm. Although the bicep crosses the shoulder joint, it is a better shoulder-joint stabilizer than mover. The bicep curl is broken down into two phases; 1. Flexion and 2 Extension. The biceps curl can be done standing, or seated Phase 1. Flexion Elbow: Hinge joint.

Concentric contraction of agonist muscle biceps brachii causes flexion at this joint. Antagonist muscle triceps brachii relaxes and lengthens. The synergist muscle brachialis works with the biceps brachii muscle to flex the elbow joint. Phase 2. Extension Elbow joint: Eccentric contraction of antagonist muscle triceps brachii allows for controlled extension at the elbow joint. Biceps brachii and brachialis relax.

Below is list of the muscles and joints common in both phases of the biceps curl. During the bicep curl the Shoulder ball and socket joint maintains flexion of the upper arm and acts as a fix ator through the isometric contraction. The deltoid muscles, providing a leverage point for the biceps and triceps brachii. The elbow hinge joint is made up from the humerus, ulna and radius. The elbow provides a small amount of rotation as well as a hinge action, which is needed to carry out the biceps curl. The human body is a system of levers, which allow us to perform basic and complex movements.

Bones are the rigid part of the levers, the joints provide the axes of rotation, and the muscles provide the force or tension needed to generate movement. The force produced by a muscle through tendons to the bone. The biceps curl is a third class lever, a small contraction of the biceps muscle can cause a wide & rapid movement of the hand. Example of a third class lever is a mousetrap shown below. Third-class levers have the effort applied on the same side of the fulcrum as the resistance but the effort is applied between the resistance and the fulcrum, and both effort and resistance move in the same direction.

These two diagrams above shows the angle of the arm at the start and finish of the biceps curl.