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Background. We aim to link fitness-related genotypes to the development of specific physical fitness phenotypes and a predisposition towards a specific sport category in Lithuanian elite athletes. Materials and methods. The study involved 193 athletes (152 male and 41 female) and 250 controls. The athletes were stratified into four groups: endurance, mixed sports, speed / power, and team sports. Genotypes of the athletes were identified according to the genetic polymorphisms: ACE (rs1799752), ACTN3 (rs1815739), PPARGC1A (rs8192678) and PPARA (rs4253778). One-way analysis of variance and logistic regression modelling were used for testing the genotype–phenotype association. Results. The frequency of ACE I allele was higher in athletes than in controls, although only male athletes showed a significant difference from male controls. The PPARA C allele was more common in the athlete group than in the general population of Lithuania. There were no significant ACTN3 and PPARGC1A SNP allele / genotype frequency differences between the athlete group and the controls. We have found that the ACTN3 RR genotype is associated with single muscular contraction power; the PPARGC1A Ser482Ser was associated with the muscle fat mass index; the PPARA CC and ACE II genotypes are associated with the muscle mass and single muscular contraction power. The effect of the gene variants was different for male and female athletes. Conclusions. The ACE II, PPARA CC, ACTN3 RR genotypes are related to the speed/power sports and the ACE DD, PPARA GG are related to the endurance sports in Lithuanian athletes. PPARGC1A Ser482Ser may be not critical but rather additive to endurance performance. Keywords: physical performance, ACE, ACTN3, PPARGC1A and PPARA genetic variants, sport category

La cohesión y la cooperación son dos mecanismos psicológicos del equipo diferentes teóricamente, y relativamente independientes. En este trabajo se pretende estudiar, en una muestra de 945 jugadores de fútbol de competición, con edades comprendidas entre los 12 y los 18 años (media: 14.7 y dt: 1.8) los niveles de cohesión y de cooperación, y su relación entre sí, así como con otras variables. Los resultados indican que los factores de la cohesión deportiva se comportan casi como un factor único, al contrario de lo que ocurre con la cooperación, y que existe rela-ción entre cooperación incondicionada y cohesión. Se ha hallado diferencia significativa entre los jugadores titulares y suplentes, respecto de la coope-ración condicionada y de la cohesión global, pero no aparecen cambios con la posición de juego ni con los años de práctica. Finalmente, la co-hesión puede ser determinada en parte por la cooperación, mientras que el factor de la cohesión de la aceptación de roles se demuestra relevante para ambos constructos. ------ ABSTRACT ------ Cohesion and cooperation are two psychological mechanisms of teams that are theoretically different and relatively independent. The intent of this study was to assess the levels of cohesion and cooperation and the relationships between them, as well as other variables, in a sample of 945 competitive football players between the ages of 12 and 18 years (M = 14.7, SD = 1.8). The results indicate that the factors of athletic cohesion behave almost as one single factor, which is the opposite of what happens with cooperation, and that there is a relationship between uncon-ditional cooperation and cohesion. There is a significant difference be-tween starting and bench players with regard to the conditional coopera-tion and overall cohesion, but there are no differences with regard to player's position nor with the years of practice. Finally, cohesion may be determined in part by cooperation, while the factor of cohesion of the acceptance of roles has been demonstrated to be relevant for both con-structs.

La cohesión y la cooperación son dos mecanismos psicológicos del equipo diferentes teóricamente, y relativamente independientes. En este trabajo se pretende estudiar, en una muestra de 945 jugadores de fútbol de competición, con edades comprendidas entre los 12 y los 18 años (media: 14.7 y dt: 1.8) los niveles de cohesión y de cooperación, y su relación entre sí, así como con otras variables. Los resultados indican que los factores de la cohesión deportiva se comportan casi como un factor único, al contrario de lo que ocurre con la cooperación, y que existe relación entre cooperación incondicionada y cohesión. Se ha hallado diferencia significativa entre los jugadores titulares y suplentes, respecto de la cooperación condicionada y de la cohesión global, pero no aparecen cambios con la posición de juego ni con los años de práctica. Finalmente, la cohesión puede ser determinada en parte por la cooperación, mientras que el factor de la cohesión de la aceptación de roles se demuestra relevante para ambos constructos Cohesion and cooperation are two psychological mechanisms of teams that are theoretically different and relatively independent. The intent of this study was to assess the levels of cohesion and cooperation and the relationships between them, as well as other variables, in a sample of 945 competitive football players between the ages of 12 and 18 years (M = 14.7, SD = 1.8). The results indicate that the factors of athletic cohesion behave almost as one single factor, which is the opposite of what happens with cooperation, and that there is a relationship between uncon- ditional cooperation and cohesion. There is a significant difference be- tween starting and bench players with regard to the conditional coopera- tion and overall cohesion, but there are no differences with regard to player's position nor with the years of practice. Finally, cohesion may be determined in part by cooperation, while the factor of cohesion of the acceptance of roles has been demonstrated to be relevant for both constructs