The Influence Of The Material And Gauge Of Tennis String On The Groundstroke Performance And Racket-hold Forearm’s Impact Force

The purposes of the research:chose two different kinds of material of tennis string often used by tennis lovers, that is TAAN TS5000 polyester string whose diameter is 1.25mm with the gauge of 16L and TAAN TS5800 nylon synthetic gut string whose diameter is 1.25mm with the gauge of 16L, in addition, two different kinds of gauge of tennis string, that is TAAN TS5000 polyester string whose diameter is 1.25mm with the gauge of 16L and TAAN TS5600 polyester string whose diameter is 1.25mm with the gauge of 16L as the string of the tennis racket for the experiment. The objects of the experiment are 15 under graduations majoring in tennis in Beijing Sport University, who are all the national tennis player of the second-class. Simulating the actual hardcourt conditions of the play through experiment, to test the influence of the different kinds of material and diameter of tennis string result in the stroke effects and impact load of the racke-holder’s forearm.The method of the research:ExaminationThe results of the examination:The groundstroke effects behind the baseline were reflected by the stroke’s speed and accuracy:the speed of the subjects was measured by the radar gun, and the accuracy by the technique test standard, record the the score of the stroke, and then analyze the accuracy of them.The conclusions of the research:1. The harder (rough) string of polyester string and nylon synthetic gut string, have no effect on it. In additional, the two different kinds of material and gauge of tennis string have a little influence on the accuracy of groundstroke. According to the research analizations.2. The two different kinds of material and gauge of tennis string have no effect on the vibration frequency of the tennis racket when the subjects used racket imapcts the ball and swings the racket forward.3. The two different kinds of gauge of tennis string don’t have great effects on the discharge duration of the Pronation teres, the Padial lateral wrist flexor and the Refers to the extensor;and The two different kinds of material and gauge of tennis string all have great effect on the discharge duration of Gong radial muscle in the subjects’racket-hold forearm.