The basic aim of this research was to determine the magnitude of the effect of short-term high intensity interval training (HIIT) on transformation of morphological characteristics and motor abilities in physically inactive women. Based former studies, one can assume that aerobic training of high intensity will probably affect the improvement of motor abilities and reduction of body mass in bodily inactive women. Subject of this research were 30 examinees of an average aged 32.2±1.83., who were physically inactive in the past year, but they have previous training experience necessary for realization of predicted training content. Examinees did not have conspicuous health problems or injuries in the past year. Morphological status (body height: 171.1±7.82 cm and body mass: 76.17±11.74 kg) shows increased body mass index 26.67 ± 3.62 and excess of body fat in total body mass. Morphological characteristics are evaluated with battery of 8 tests, while muscular endurance and explosive strength are evaluated with 5 variables which cover all topological regions of the body. Experimental training treatment lasted for 4 weeks with frequency of 4 trainings per week, which is in total 16 training units. An average duration of the training lasted between 45-50 minutes, and training principles of high intensity interval training are applied (HIIT).Analysis of pre-post differences in the group of morphological variables, we can conclude that all variables except for circumference of the waist/hip which statistically and significantly differ (p<0.05) in final compared to initial measurement in range of 0.73% to 5.32% with an average effect of 3, 53%. Analysing the results acquired in motor tests, we can conclude that there is a statistic difference (p<0.05) between all results recorded in final when compared to initial testing, in range of 15.1% to 148.9 % with average effect of 67.2%. By comprehensive analysis of effects conducted during the training program, the conclusion is imposed that changed experimental protocol when observed quantitatively, has triggered positive transformational effects in all researchable variables.
Key words: HIIT, body fat, physical fitness