McLeod - Swimming Anatomy - 2010

Execution

1 . Position yourself so that you are standing 12 inches (30 cm) from a wall. Begin by holding an air-filled ball (for example, a soccer ball) in the palm of your hand, as a waiter would hold a serving tray overhead.

2.Initiate the bouncing motion by moving your entire arm. The target on the wall is either the 1 1 0 'clock (left arm) position or 1 0 'clock (right arm) position.

3.Emphasize small, rapid bounces.

Muscles Involved

Primary:Anterior deltoid, middle deltoid, posterior deltoid Secondary:Trapezius, rotator cuff (supraspinatus, infraspinatus, teres minor, subscapularis)

Swimming Focus

This exercise is useful for developing strength when the hand is in an overhead position, which will increase your confidence when you are trying to elongate your stroke. The hand positioning with this exercise closely mimics that seen with freestyle and butterfly. As a result this exercise can be beneficial in developing a quick transition from the catch portion of both strokes to the pulling portion.

When performing the bouncing motion, emphasize small, rapid movements to focus on the deltoid and rotator cuff. This exercise builds endurance in the scapular stabilizing and rotator cuff muscles, which aids in the prevention of injuries. If you use larger movements, you recruit the pectoralis major and latissimus dorsi, which is not the goal of this exercise.

CHAPTER 4

CHEST

The primary muscle of the chest, the pectoralis major, is one of two humeral propeller muscles involved in generating most of the forces that propel a swimmer through the water. With the aid of the shoulder girdle muscles described in chapter 3 and the muscles of the arm described in chapter 2, the forces generated by the pectoralis major are transmitted to the hand and forearm, which serve as the primary force conduits through which a swimmer guides the body through the water. Other muscles in the chest region are the pectoralis minor and the serratus anterior.

The pectoralis major (figure 4.1 on page 62) is typically divided into two heads: the clavicular (upper) head and the sternal (lower) head. The clavicular portion comprises the upper portion of the pectoralis major and arises from the anterior surface of the inner half of the clavicle. The sternal portion forms the lower portion and arises from the anterior surface of the sternum and the cartilage of the first six ribs. The upper and lower portions join and cross the shoulder joint, attaching to the humerus. As the pectoralis major contracts and pulls on the humerus, the following movements take place at the shoulder joint: flexion, extension,

adduction, and internal rotation. Flexion involves bringing the arm from the side of the body forward. Extension, the reverse of flexion, involves returning the arm to the side from a flexed position. Adduction involves bringing the arm toward the midline of the body when it has been raised to the side; this movement can be either horizontal or vertical in nature. Internal rotation involves rotating the hand across the body so that the palm is resting on the abdomen. For an in-depth description of the pectoralis minor and serratus anterior, refer to the introduction to chapter 3. For this chapter it is best to think of their role in helping to stabilize the shoulder blade and in turn the shoulder joint as the pectoralis major acts on the humerus. A number of other muscles are also activated during the exercises described in this chapter. The anterior deltoid often functions to assist the pectoralis major with shoulder flexion. The latissimus dorsi assists with shoulder extension, and the triceps brachii functions to extend the elbow joint during the many pressing exercises that target the pectoralis major.

As previously mentioned, the pectoralis major is one of two primary force generators acting to propel a swimmer through the water. During freestyle and butterfly, as the hand first enters into the water and the body is in an elongated position, the pectoralis major initiates the pulling phase of both strokes. At this time the upper portion of the pectoralis major is a key contributor to the movement. As the hand moves toward its anchor point, the lower portion along with the latissimus dorsi joins in to assist in propelling the swimmer through the water. As the hand passes below the shoulder joint, the contribution of the upper portion of the pectoralis major decreases and the lower portion takes over the primary responsibility for completing the propulsive phase. As in butterfly and freestyle, during breaststroke the upper portion of the pectoralis major is important in initiating the propulsive phase of the stroke, beginning with an outward sweep of the hands. As the hands transition into the lateral sweeping motion, the pectoralis major continues as a contributor, functioning both to adduct and to rotate the shoulder joint internally. The pectoralis major is active during the shift from the propulsive phase to the recovery phase as the hands are brought together at the midline of

because the swimming motion activates it to a large degree. Therefore, although using exercises that target the muscles in the chest is important, keep in mind that one of the key goals of a dryland program is to address muscle imbalances, not accentuate them. To avoid overemphasizing the chest, use a 2: 1 ratio of pulling exercises that emphasize the latissimus dorsi to pushing exercises that emphasize the pectoralis major.

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