The aim of this study is determination of cardio-respiratory endurance level and its influence on the manifestation of certain anthropometric and motor differences in 14 years old male pupils. The main sample contains 156 fourteen year (+ 0.5 year) old male pupils from 15 primary schools from all urban and rural regions in the Republic of Macedonia. For the prediction of cardio respiratory endurance level multistage 20 meters shuttle run test was used (20SRT). According to the success in 20SRT test, using k-means clustering method, there were established three (N/Z-scores means) maximum distinguish groups with low (52/-1.112), average (66/.126) and high (38/1.304) level of cardio respiratory endurance. The anthropometric parameters triceps skin fold thickness, body height, body weight, and body mass index (BMI), as well as 5 motor tests from battery EUROFIT for children (bent arm hang, sit-ups, standing broad jump, shuttle run 10x5 and hand grip dynamometry) were used in the study. The inter-groups differences in all analyzed anthropometric and motor manifestations were obtained with statistical method ANOVA. The obtained results of the study show significant inter-groups differences ŠF (df1,2) = 2.174; p < .05¹ in all analyzed variables, except in variables body height and hand grip dynamometry, which indicate that, in this period of adolescence, better level of cardio-respiradory endurance generates higher level in analyzed components of physical fitness and lower level of fat body mass.
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