Page 33 - MANUAL ESTUDIANTES ENG ML1

CHAPTER 9. DYNAMICS
9.1 FRONT-BACK BEATS
Keep in mind that performing this type of beats on rope can increases the risk of shoulder injury. (kinetic parameters shoulders).
9.1.1 TECHNIQUE
To perform this skill, the rope can be placed to the side or between
the legs depending on the skill we want to perform next. Independent of the technique used (arms straight or bent), the head should be placed neutrally in between the arms during the back beat, the same as when stretching the shoulders. Because of the maximal explosive stretching of the shoulders happening when swinging back, performing this type of beats increases the risk of shoulder injury, particularly to the glenohumeral area and the rotator cuff. This maximal stretching (flexion effort) occurs as the result of the force applied to the shoulders during the back beat; this force in turn, will depend on the energy generated by the body weight, the speed of rotation, and the distance from our center of gravity to the axis of rotation.
A greater amplitude on the front beat will generate more rotational energy during the descending phase. If we have the proper shoulder flexibility the stress applied to the glenohumeral area will be less during the back beat, since we will be able to reach the weightless moment without reaching maximum shoulder extension. A lack of
flexibility will mean our shoulders will absorb the impact of all the energy produced by the front beat, reaching full extension before attaining the weightless moment and causing major stress to the glenohumeral area, increasing the risk of injury. Shoulder flexibility, strength, and stability plays a critical role in injury prevention.
STRAIGHT ARMS in the BACK BEAT:
This technique allows us to achieve a more powerful ballistic movement, since it involves a "single leverage point" (shoulders).
However, we also lose some height in the back beat.
BENT ARMS in the BACK BEAT:
This technique allows us to gain height in the back beat, because of a greater scapular retraction and chest extension. However this will place more stress on the glenohumeral area than when using straight arms, due to the position of the humerus bones, thereby increasing the risk of injury.
While we may be able to reach more height, we will be losing power due to the shock absorption effect of the arms ("double leverage point", shoulders plus elbows).
FRONT BEAT:
Depending on the movement desired, we can do a front beat flexing the hips (pike beats used in a back salto, etc.) or in a straight line with a full body extension and engagement of the glutes, with a pull-up (twists and variations) or without a pull-up (360o, etc.).
GLUTE ENGAGEMENT should be performed with proper retroversion of the pelvis (pelvic retroversion). BREATHING: Inhalation during the back beat, forced exhalation during the front beat.
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