Kinematic and electromyography characteristics of performing butterfly stroke with different swimming speeds in flow environment

ObjectiveTo investigate effect of flow speeds on the upper limb muscular activity butterfly swimmers training in a environment. A comparison kinematic characteristics and limbs were made when with different swimming flume. The purpose was to provide basis for scientifically formulating special advice athletes' environment.MethodsTen youth female participated study speed 70%, 80%, 90% level their max speeds. stroke cycle divided into four phases (entry, pull, push, recovery). parameters (stroke rate, length, duration each phase cycle) (onset timing, integrated electromyography (iEMG), contribution ratio) muscles (Biceps brachii (BB), Triceps (TB), Pectoralis major (PM), Latissimus dorsi (LD)) collected analyzed phases.ResultsThere no significant difference between rate length There differences among phases. entry had longest duration, pull shortest push longer than recovery phase, shorter phase. BB PM activated significantly earlier at target 80% speed, while TB later other two ratio highest lowest pushing lower three higher LD it phase.Conclusions(1) When athletes environment, didn't make or muscle activation movement except onset timing. (2) Stroke main factor during arm young athletes.