The physical fitness of police officers needs to support good health and physical performance. Physical fitness comprises a considerable amount of training for police students who are to become police officers. However, to what degree police students are able to perceive their fitness level and differentiate between health-related and performance-related physical fitness is unknown. Therefore, the first aim of this study was to investigate the possibility of differentiation between health-related and performance-related physical fitness using physical self-concept and measured indicators of physical fitness. The second aim of this study was to investigate the association between components of physical self-concept and measured indicators of physical fitness of police students. The sample of 177 police students of both sexes (98 males and 79 females) completed a 40-item physical self-description questionnaire and their physical abilities were assessed for handgrip strength, standing long jump, 30 s sit-ups, and 12-min running. Principal component analysis established health-related and performance-related physical fitness from both perceived and measured physical fitness measures. Correlation analysis revealed a significant relationship between the perceived and measured physical fitness. Results suggest small to moderate ability to recognize the level of certain physical abilities, indicating the association between psychological mechanisms and biological functioning.

Significant deviations from recommendations for healthy lifestyle was noted in adolescents' habits, knowledge and practice. It is therefore necessary to develop and organize programs for promotion of healthy behaviours adapted to the adolescents' needs.

Introduction To achieve an improvement in self-regulation, and consequently competitive performance, it is necessary to evaluate psychological skills training programs. It was hypothesized that the introduction of autogenic training and guided imagery could bring about positive changes in anxiety and self-confidence, as compared to regular training and competitive activities. Objective To investigate the effects of a psychological skills training program on the optimization of anxiety and self-confidence. Methods Twenty-four athletes from the Serbian national karate team were divided into experimental (EXP) and control (CON) groups. During eight weeks, both groups underwent an identical karate training and competing program. The program was adapted for top karate athletes according to their daily routines and the specific demands of the activity. In addition, the EXP group underwent the psychological skills training program, based on autogenic training and guided imagery. The Competitive State Anxiety Inventory-2 was used to measure the multidimensional construct of the state of anxiety, and the Movement Imagery Questionnaire-3 to assess individual ability to imagine movements. Results Repeated measures ANOVA results indicated a difference in anxiety levels between the EXP and CON groups after the intervention. Further analysis indicated a decrease in cognitive anxiety and an increase in self-confidence among participants from the EXP group. Conclusion The applied psychological skills program had a positive effect on anxiety optimization and self-confidence levels in top karate athletes. As emotional self-regulation is also crucial for athletes of other sports, the implementation of this intervention can be recommended, provided that it is adapted to the specific characteristics of each sport. Level of evidence II; Therapeutic studies – Investigating treatments results.

Date of dissertation defending: _________________________ ZahvalnostHvala prof. dr Nebojši Petroviću, mom mentoru na ukazanom poverenju, koji je strpljivo razvijao moju samostalnost.Hvala članovima komisije, prof. dr Mariji Mitić, doc. dr Goranu Opačiću i prof. dr Dušanki Lazarević, koji su me iskrerno podržavali i vešto usmeravali.Hvala dr Nadi Polovini, mom dugogodišnjem supervizoru i uzoru zato što je podstakla moju radoznalost bez koje ne bih pošla na ovo putovanje. Hvala prof. dr Vladimiru Koprivici koji me je sa lakoćom i mudro usmeravao da pronađem svoje mesto u sportu.Hvala mom prijatelju i kolegi Nikoli Petroviću od koga sam naučila kako se prepreke u prikupljanju literature pretvaraju u mogućnosti. Hvala Slavici Miletić koja je svojim lektorskim umećem ovaj rad jezički i stilski unapredila. Hvala mom prijatelju Daliboru Šipki koji je značajno doprineo izgledu teksta. Hvala svim sportistima, roditeljima i trenerima koji su učestvovali u ovom istraživanju i mojim prijateljima i kolegama koji su mi omogućili da prikupim veliki uzorak. Posebno se zahvaljujem doc. dr Zoranu Valdevitu i RK "Junior", koji su i tokom pripreme za ovaj poduhvat bili uz mene, treneru Bojanu Iliću, mr Nenadu Koropanovskom, prof. dr Goranu Nešiću, kolegama Milanu Sikimiću, Radivoju Mandiću, Radovanu Tomiću i selektoru mr Goranu Maksimoviću.Hvala mojim prijateljima koji su me pratili na ovom putovanju: Srđanu Markoviću, Ivoni-Katarini Jevtić, Gordani Vekarić, Marini Đorđević-Nikić, Slobodanu Spaciću, i Tatjani Radanović-Rajković.Hvala mojim roditeljima Slavici i Vlastimiru, koji su svojim beskrajnim razumevanjem pomogli da postanem sve ono što sam želela, koji su me bezuslovno podržavali da stignem do kraja ovog puta. Doktorska disertacija: Roditelji kao agensi sportske socijalizacije mladih RezimeTema ovoga rada je sportska socijalizacija mladih, a poseban naglasak je stavljen na ulogu roditelja mladih sportista u tom procesu. Istraživanje na kom je rad zasnovan imalo je tri osnovna cilja: a) utvrđivanje efekata sportske socijalizacije među mladima, kao i karakteristika i načina angažovanja roditelja u vezi sa sportskom aktivnošću mladih; b) specifikacija doprinosa raznih činilaca i mehanizama kojima roditelji deluju kao agensi sportske socijalizacije u specifičnim uslovima naše sredine; c) definisanje sadržaja funkcionalne uključenosti roditelja u sportsku aktivnost mladih. Teorijsku osnovu rada čine dve teorije motivacije. Jedna je teorija ciljeva (AGT), čiju je primenu u sportu među prvima predložila Duda i po kojoj je svaka osoba usmerena ka nekom cilju i želi da demonstrira svoju kompetentnost. Druga je teorija samoodređenja (SDT) Disija i Rajana, u kojoj je izgrađen diferenciran pristup motivaciji za učestvovanje u različitim aktivnostima.Ovo istraživanje je miks-metodsko (kombinuje kvantitativnu i kvalitativnu metodu) i sprovedeno je u dve faze: u prvoj je realizovano kvantitativno istraživanje na uzorku mladih sportista (n=227) uzrasta od 15 do 18 godina, oba pola, koji se takmiče u okviru individualnog ili ekipnog sporta i...

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