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Background. Hemp seed oil obtained by cold pressing is a source of polyunsaturated fatty acids omega 3 and omega 6 required for a normal diet. Aims. The study investigated the effects of dietary supplementation with hemp seed oil on aerobe effort capacity in experimental conditions. Materials and methods. The research was conducted in six groups (n = 10 animals / group) of male Wistar adult rats. The groups I-III comprised rats trained to exercise with different intensity, IV-VI groups included rats trained with different intensity of effort and supplemented with hemp oil. In all groups aerobic exercise capacity was determined daily for 27 days using the swimming test. Results. Compared with control grups (I,II and III) we found significant increases of the aerobic capacity in groups supplemented with oil (IV,V and VI) throughout the study. The maximum increase of aerobic capacity was in the group with 10% loading and oil supplementation compared with the groups with 15% and 20% loading with or without oil supplementation. Conclusions. Our study shows a favorable effect of polyunsaturated fatty acids on aerobic capacity.

Key words: rats, poliunsaturated fatty acids, exercise, aerobic capacity.