Monday, October 11, 2010

phase 1

From a sagittal view: The dominate shoulder is abducted about 90 degrees along the frontal plane in the anteropsterior axis of rotation, and elbow is flexed about 90 degrees along the sagittal plane in the mediolateral axis of rotation. The other shoulder is flexed about 60 degrees and holding the ball. Flex knees to about 35 degrees. Key fact: feet should not be parallel to each other because balance will be off. The non dominate foot goes in front of the dominant foot. 

phase 2

From a sagittal view: Throw the ball up by extend non dominant shoulder keeping, it in front where it is visible at all times. Dominate shoulder is abducted and flexed ready to hit the ball. Dominate leg must be hyperextended about 15 degrees. Note: legs are extended because the legs help with ball toss.

phase 3

From sagittal view: Contact the ball with the palm of dominate hand while plantar flexing non dominant foot and dorsiflex dominant foot. Then follow through with dominate leg. The non dominate shoulder is hyperextended about 10 degree. In the process of serving the ball, not only is arm strength needed but core strength, so hips and abs are going to be contracted and back will flex about 20 degrees giving power to the serve. 

phase 4

Once serve has gone over the net and the ball has traveled in a curvilinear motion, go back on the court into defensive position which is arms flexed at about 45 degrees , elbows flexed about 45 degrees,  knees flexed about 90 degrees, and on the ball of feet to move for the ball.

Scientific Terms:

Abduction-moving an appendage’s distal end away from the midsagittal plane.

Flexion- decreasing the angle of a joint.

Extension- increasing the angle of a joint.

Hyperextension- moving a joint beyond its normal range, or beyond the anatomical position.

Plantar flexion- movement of the foot that flexes the foot or toes downward toward the sole.

Dorsiflexion- flexion of the foot in an upward direction.

Qualitative- involving nonnumeric description of quality to analyze human movement.

Quantitative- involving the use of numbers to analyze human movement.

Axis of rotation- imaginary line perpendicular to the plane of rotation and passing through the center of rotation.

Linear- along a line that may be straight or curved with all parts of the body moving in the same direction at the same speed.

Curvilinear- along a curved line.

Sagittal Plane- plane in which forward and backward movements of the body and body segments occur. Sagittal plane movements include flexion, extension, hyperextension, dorsiflexion, and plantar flexion.

Frontal plane- plane in which lateral movements of the body and body segments occur. Frontal plane movements include abduction, adduction, later flexion, elevation, depression, inversion, eversion, and radial and ulnar deviation.

Joint flexibility- a term representing the relative ranges of motion allowed at a joint.

Range of motion- angle through which a joint moves from anatomical position to the extreme limit of segment motion in a particular direction.

Glenohumeral joint- ball and socket joint in which the head of the humerus articulates with the glenoid fossa of the scapula.

Mediolateral axis- imaginary line around which sagittal planes rotations occurs. 

Anatomical reference position- erect standing position with all body parts, including the palms of the hands, facing forward; considered the starting position for body segment movements. 

Anteroposterior axis- imaginary line around which frontal plane rotations occur. 

Agonist- role played by a muscle acting to cause a movement.