Immediate effect of neuromuscular electrical stimulation on kinematics of shot put stand throw.

Introduction: Shot put throwing techniques are divided into spinning and sliding, and must have certain physical qualities such as speed, explosive power, and coordination. The purpose of this study was to analyze the effect of neuromuscular electrical stimulation intervention training on shot put throwing performance and to explore the shot put throwing technique and kinematic differences at each movement stage. Methods: Fifteen male college students who had not received electrical stimulation previously were the research participants. Two high-speed cameras were used to obtain synchronous images of shot put throwing actions of the participants before and after electrotherapy. Three-dimensional kinematic image analysis was performed using the Kwon 3D motion analysis system. The Wilcoxon signed-rank test was used to test differences in shot put parameters at each action stage before and after electrotherapy. Results: Throwing distance was longer (p < .01) and throwing speed was faster (p < .01) after electrotherapy than before electrotherapy. The ankle joint angle with the lowest center of gravity (p < .05), ankle joint angle of the left foot off the ground (p < .01), and ankle joint angle of the right foot was off the ground (p < .05) were greater after electrotherapy than before electrotherapy. The shoulder-hip separation angle in the throwing stage was smaller (p < .05), shoulder-hip separation angle in the turning stage was larger (p < .05), and left ankle joint angle in the turning stage was smaller (p < .05) after electrotherapy than before electrotherapy. Conclusion: Neuromuscular electrical stimulation has an impact on shot put throwing. Appropriate electrical stimulation can enhance muscle activation, increase muscle contraction force, and improve athletic ability and shot put throwing performance. [ABSTRACT FROM AUTHOR]