Page 91 - AERIAL ACROBATICS & CALISTHENICS VOL. 1 (ENG).pdf

9.2.1 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 stretch- ing 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 glenohu- meral 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 gen- erate more rotational energy during the de- scending phase. If we have the proper shoulder flexibility the stress applied to the glenohumer- al 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 at- taining the weightless moment and causing ma- jor stress to the glenohumeral area, increasing the risk of injury.
Shoulder flexibility, strength, and stability plays a critical role in injury prevention.
ROPE
infographic
= 70 kg
V = velocity
Back beat
0 kg
0 kg
Front beat
V2
glenohumeral stress
V1
glenohumeral stress
glenohumeral stress
THE AERIAL MOVEMENT®
89
maximum weight Dynamometer test: V1 ≈= 180 kg — V2 ≈= 350 kg
velocity
velocity
velocity
velocity