The Study Of Men’s100Meters Backstroke Swimming Stroke Hands Technology Analysis And Propulsion Changes

Swimming is the movement which combines skills and power. Among the fourgestures, the backstroke is the only one which lying on the surface of the water on theswimming style. In backstroke swim, athletes driven body forward mainly through thepropulsive force, it generated by the left, right arms alternately draw water, then thetechnology of oarsman is obviously important. In this study, a total of16namedsubjects select different levels of swimmers, we use Casio EX-FH25the Nikon P500high-speed camera and GGC-16-type force measuring device to measure the16subjects, in that way, we could get the stroke length and stroke frequency data andmechanical data of the athletes. Study the changes of different level athletes’100backstroke length and stroke frequency. Different levels of athletes in each25msegment, we compared the changes of time (Into the water and grab the water,pushing the water on the program, air shift arm) power and rapid which their strokehands alternated by left and right arms, as well as the athletes push the size of thewater before the arm angle and athletes underwater body position changes. Thenthrough the data, to identify the differences between the different levels of athletes inthe backstroke swim paddlers technology and advancing force size changes. In orderto evaluate the technical movements of the athletes, guide scientific training andimprove athletes performance.The main findings of this paper:1. In the every25meters section at the100-meter backstroke swimming, stroke frequency of level1athlete and level2athletes has a descending trend, in the corresponding25meters section strokes frequency of level1athletes generally higher than stroke frequency of level2athletes.2. In the100-meter backstroke process, stroke rate of level1athletes in every25meters section shows ascendant trend, stroke rate of level2athletes inevery25meters section assumes the drop tendency. In the corresponding25meters section, stroke rate of level1athletes is higher than level2athletes, soas the ability of keep the stroke rate.3. In the100-meter backstroke process arm moves (Into the water and grab the water, pushing the water on the program, air shift arm), every sectionhas a descending trend. In the part of into the water and grab the water, pushing the water on the program, the time of level1athletes is obviously faster th an level2. In the part of air shift arm, the time of level2is slower than level1.4. In the100-meter backstroke process, both the two parts (Into the water and grab the water, pushing the water) that produce motive power, their driving force has a descending power. In the corresponding25meters section, thedriving power of level1athletes is greater than level2athletes, the gap is very obvious.5. In the corresponding25meters section, the hands movement (Into thewater and grab the water, pushing the water on the program, air shift arm) rapid of level1athletes is faster than level2. Especially the two sections of into the water and gab the water and the air shift arm, level1is faster than level2.6. Before the driving section, the angle between upper arm and lower arm is about65-75°of level1athletes, and the angle of level2is about80-90°,technology has obvious differences.7. Compare the two levels, level1athletes’body position is closer to thewater surface, also the maintaining of the body streamline is stronger. However, after left hand push the water, compare the depth of the arm away from the surface, level2is higher than level1.