engleski

Influence of latent morphological features of students on the judo technique performance efficiency grade

In many studies it has been etermined that certain features have influence on performance quality of certain judo techniques. On the sample of PE students Sertić (1993) determined significant correlation between indices of longitudinal dimensionality and quality of performing certain judo throwing techniques. He also investigated (2000) influence of a greater number of morphological features on the process of learning judo techniques and found that influence to be negligible. The subjects were PE freshmen in Split, aged 18-20yrs. The sample of predictor variables embraced: anthropometric measures assessing body volume and mass (9), longitudinal dimensionality (5), transversal dimensionality (8) and subcutaneous fatty tissue (8). The criterion variable was derived from individual effeciency grades produced by five judo experts for the performance of 33 elements from various groups of judo technique (6 falls, 13 throws, 14 floor techniques), according to the systematisation of Kodokan. Classical analysis metric characteristics of multi-item tests assessment was used to verify reliability and validity. Latent structure of anthropometric variables was determined by using component model of factorial analysis. Regression analysis was used to determine relations between athropometric dimensions and performance. By means of factorial analysis and GK criterion the set of anthropometric measures was successfully reduced to five interpretable latent dimensions which explain 67% of the variance of anthropometric features (the first principal component explains 30.09%, the second 18.11%, the third 9.27%, the fourth 1.54% and the fifth 1.34%). Statistically significant influence of morphologocal dimensions on the judo technique performance grade was determined at the significance level of 95% by means of regression analysis. Individual anthropometric measures contributed variably to the obtained correlation. Significant negative correlation of longitudinal dimensionality and judo technique performance was obtained at the significance level of 99%. The obtained results may be explained by the crucial role of measures transversal dimensionality and voluminosity as well as of body mass. Measures of longitudinal dimensionality and of subcutaneous fatty tissue have negative influence on efficiency in judo (statistical negative correlation has been determined only for the former dimensionality) meaning that the subjects with the pronounced measures of longitudinal dimensions got lower grades for their performance of judo tecniques due to a greater number of performance errors. On the sample of 60 PE students the statistically significant relations were determined among five anthropological dimensions. Longitudinal dimesionality of skeleton had the greatest although negative predictive power.

morphology; latent dimensions; influence; regression analysis; judo; technique quality

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