RT Journal Article SR Electronic A1 Videmšek, Mateja A1 Štihec, Jože A1 Karpljuk, Damir T1 Determination of diferences in runs between boys and girls aged 5.5 JF Acta Universitatis Palackianae Olomucensis. Gymnica YR 2005 VO 35 IS 2 SP 105 OP 111 UL https://gymnica.upol.cz/artkey/gym-200502-0013.php AB The aim of this research is to determine whether there are distinctions in runs among five and a half year old boys and girls. The research is based on studying 80 girls and 64 boys from seven kindergartens in Slovenia. The following five measurement methods have been used in our research: a 10-meter run, a 150-meter run, a 10-meter run with a flying start, 4-times 5-meter run, and a 300-meter run. The results of the t-test indicate a statistically characteristic difference among boys and girls in 300 m run test results only, that is, a method used for measuring aerobic endurance. Other motor skills results have shown that there are no statistically characteristic differences among boys and girls. It is important that sport activities for boys and girls are organized for both groups of children equally. Especially girls must take part in a variety of running exercises in order to increase their aerobic endurance. They should be encouraged to take part in a variety of games which require activating the energy component of movement. Based on the results of this research we can say that physical education (PE) of preschool children should be planned regardless of sex and the PE program should be the same for both boys and girls.