ABSTRACT
Throwing is a very difficult action which needs the coordination of many parts of the body. Throwing ability is of great value in infants’ daily life, work and physical activities. So it is significant to observe infants’ development in throwing action as well as its development patterns.[1-3] Research on human’s throwing action by far for the purpose of improving competitive sport performance such as shout put, hammer throw and javelin. Other research concerning average healthy infants focused on the value of games to the development of infants’ throwing ability.[4-6] Rarely is there any research or documents monitoring infants’ structure of throwing action, changes of joint angle of different phase and the maturity of action from the aspect of sport biomechanics. This paper is based on sport biomechanics and conducts technical analysis on infants’ throwing action by means of video analysis. The study focuses on the feature difference and development pattern of body movement of different age and gender, so as to lay a foundation for the evaluation of the development level of infants and
into phases and obtains indices of joint angle change of the subjects with a calibration error less than 0.5 mm. DV tracker was employed to analyze these videos and configure physical quantity to be analyzed. Matsui Hideji’s 15-link model was adopted and 21 tracking points were used to calculate human gravity center. The measured data were processed with five-spot e smoothing method. Spss13.0 was used to process data, and the data were presented with (x s± ), Independent Samples T-test was employed to compare the two groups, P < 0.05 means significant difference and P < 0.01 indicates rather significant difference.
