RT Journal Article SR Electronic A1 Bronikowski, Michał T1 Profiles of intensity loads in physical education classes in Poland JF Acta Universitatis Palackianae Olomucensis. Gymnica YR 2006 VO 36 IS 1 SP 47 OP 57 UL https://gymnica.upol.cz/artkey/gym-200601-0006.php AB The aim of the research was to compare the health-related effectiveness of various types of physical education lessons on the cardio-respiratory system. The research was carried out in the years 2002 and 2003 in two junior high schools in Poznań. There were four types of classes examined: outdoor athletics, volleyball, basketball and fun games, each type lasting 45 minutes. Heart rates of two randomly selected pupils aged 15-16 were recorded during class, with the use of Polar heart rate monitors. According to the findings of a cross-national study, Polish youth do not have enough moderate-to-vigorous activity on a daily basis (Cabak & Woynarowska, 2004). In our research the most effective in stimulating cardio-respiratory fitness appeared to be outdoor athletics classes in boys and girls, and basketball in boys. Our data support the earlier findings of other studies (Stratton, 1997; Fairclough & Stratton, 2005).