Dynamical Model-Based Aerobics Upper Limb Inward and Outward Rotation Motion Sports Injured Part Research

Abstract

In the flourishing society, aerobics as a sport event that can build one's body and cultivate one's taste, is popular among ordinary people, but due to professional knowledge deficiency, mass may unconsciously generate injuries in body when taking aerobics exercise, in order to reduce occurrence rate of such injuries, the paper firstly gets dynamics relations and arms rotational inertia when aerobics athletes exercise upper limb inward and outward rotation motion by researching, gets that aerobics athletes' arms potential energy size when exercise upper limb inward and outward rotation motion, and according to momentum theory of transmitting from near-end to far-end, athletes can strengthen elbow joint momentum through shoulder joint effective braking effect, and then transfer momentum to wrist joint by elbow joint braking to have end acceleration effects. It also gets forearm angular speed should be bigger than that of upper arm so that can more beneficial to elbow joint acceleration. And it gets that when aerobics athletes take upper limb inward and outward rotation motion, due to it should let forearm angular speed to be bigger than upper arm's angular speed to drive elbow joint acceleration, athletes should let elbow joint speed to be more faster than shoulder joint in the process, and then shoulder joint is likely to suffer injuries because of braking, by comparing, elbow joint injury extent is far less than that of shoulder joint, athlete can take some corresponding prevention measures by referencing the result.