The results of this study revealed that in addition to well-established factors such as sex, age, and overweight status, social environment factors like parents’ education, friends’ support for PA, personal motivation for PA, and organised sports participation significantly explained the variation in the PF of Lithuanian adolescents.
Factors affecting both PF are complex, but it is clear that volume and type of regular PA are of primary importance to PF status. In its own way, PA is associated with a myriad of factors 29, including the children’s household environment harrin 40 and social skills (empathy) 41. Importantly, among various benefits, regular PA is inversely associated with depressive symptoms in adolescents 42. In addition, PA level is negatively associated with overweight/obesity status 29,43, supporting the negative association in our study between BMI and performance on PF tests where body mass was either transported (i.e. running, jumping) or supported (i.e. hanging). Notably, it was organised sports participation rather than reported leisure time PA that was consistently associated with different aspects of PF. Of relevance, even if we have not analysed unhealthy habits in this study, others have reported that organised sports participation is negatively associated with unfavorable behaviours like smoking, using snus, and alcohol consumption 44, which in turn might negatively affect PF.
Social support has been proposed to be more important than the intrinsic desire for PA (exercise intention or ‘subjective norm’) of adults’ actual PA 45. In addition, the importance of a close social environment in forming the attitude, norms, and habits towards PA have been observed by others 46,47. In our adolescent population of 11-to 18-year-olds, both personal motivation and friends’ support for PA were associated with objectively measured PF. Interestingly, compared to girls, boys showed not only better performance on nearly all PF tests, but also had higher friends’ support for PA, personal motivation for PA, and a higher percentage were active and participated in organised sport, despite a higher percentage being classified as overweight/obese. Consistent with previous research 48, we found that upper-body speed/coordination was similar for boys and girls but boys outperformed girls on all other PF tests.
Since PF during adolescence prognosticates the risk of major non-transmittable (cardiometabolic) disease burden at least up to the age of 60 years 49, a practical consideration is warranted for promoting the development of PF in youth through PA, sports participation, and overall healthy lifestyle to both build the bumper and develop health-promoting habits. Close social environment affects PA level 32–35 and children’s PF positively associates with PF of their parents’ 50. However, our findings on PF status stand for the more important effect of friends’ support while family’s influence on adolescence's actual level of PF seems negligible. The lack of effect of family support for PA on PF observed in our study deserves further investigation of the underlying reasons. It could be speculated that the specific age of our population (teenagers) precludes the acceptance of support for being more active from parents and rather peers are more influential at this stage of life.
Limitations. One of the limitations of the study was self-reported levels of PA and the categorization into two groups (meeting or not meeting the WHO recommended amount of PA per day). Additionally, specifics of the engaged sports (i.e. more technical or physical; endurance or power; etc.) or a degree of involvement were not analysed, as it was not the modes of PA stratified. Moreover, a prolonged lockdown implemented for most of the organized formal PA about a year before the study might well have decreased some aspects of PF 51, changed some social and personal factors analysed here, and thus putatively the relationships. The timescale of reconditioning after the lockdown was released is however unclear, and with the cross-sectional analysis of the current study, it was not possible to solve this effect. The motivation of the schoolchildren to perform the tests maximally was left not tightly controlled or even estimated due to the large scale of the study. It also needs to be admitted that our model of the analysis (design of the study) did not allow for a clear cause-effect relationship between the factors analysed. Finally, the study was cross-sectional and performed on the participants of quite a homogeneous population, which may limit the generalizability of the findings to other groups (e.g. differing in age and ethnic mix).