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The unitary sense of self that exists across time is central to the human experience (Gallagher, 2000; Heatherton, Macrae, & Kelley, 2004). In this sense, the fundamental question on how humans understand and represent knowledge about themselves and others is attracting interest in social and cognitive neuroscience (Berkman, Livingston, & Kahn, 2017; Humphreys & Sui, 2016; Northoff, 2017). The concept of self-continuity is often defined as perceived associations of one's current self with past and future selves (Löckenhoff & Rutt, 2017). Northoff (2016a, 2017) has denoted this concept as a diachronic component linked to the awareness of the continuity of a person across time (i.e., "I am I" despite physical

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Summary Background Whether a high cardiorespiratory fitness (CRF) can attenuate the potential detrimental effect of childhood obesity on academic performance and particularly psychosocial functioning remains unclear. Objectives To analyse the academic performance/psychosocial functioning of schoolchildren attending to their CRF and weight status. Methods 470 schoolchildren (46% girls, 7 ± 0 years) from 20 schools in five European countries were categorized as (i) having overweight/obesity (n = 113) or normal weight (n = 357) attending to body mass index and (ii) ‘fit’ (n = 282) or ‘unfit’ (n = 188) based on 20‐meter shuttle‐run performance (CRF ≥ or <42 ml·kg−1·min−1 [boys] and 35 ml·kg−1·min−1 [girls], respectively). Academic performance and psychosocial functioning were assessed using the grades attained in school subjects and the Strengths and Difficulties Questionnaire (SDQ) for parents, respectively. Results Independent of their weight status, fit children showed a greater academic performance and psychosocial functioning than their peers who were unfit and overweight/obese. In fit children, academic performance and psychosocial functioning did not differ between the two weight status categories (normal weight or overweight/obesity). Conclusions Children with a higher CRF show a greater performance achievement and psychosocial functioning regardless of their weight status, thereby supporting the ‘fat but fit’ paradox and reinforcing the importance of improving CRF in this population.

To provide information regarding the anthropometric and fitness profile of young karatekas and to study its evolution with age. Data from top-level karatekas were included in the analysis: 97 athletes in the U14 category (12–13 years old), 238 in cadet (14–15 years old), 261 in junior (16–17 years old) and 177 in U21 (18–20 years old), which makes a total of 773 athlete data sets. Karatekas underwent anthropometric (weight, height, body mass index and body fat percentage) and fitness (sit and reach, 20-m shuttle run, standing long jump, overhead 3-kg ball throw, 10x5-m shuttle run, and plate-tapping) assessments during the training camps organized by the Spanish National Karate Federation between 1999 and 2016. Male karatekas were taller and heavier, and performed better than females in all the fitness dimensions assessed, except for flexibility and speed of upper limb movements. The obtained cardiovascular and lower-body muscular values indicated that karatekas in this study were placed between the 80th and the 90th percentile when compared with the general population. The results of the agility, coordination and speed of upper limb movements, and flexibility tests showed that the karatekas obtained much higher scores than those observed in age-matched populations. Young karatekas show a high fitness level in comparison with the general population, especially with regards to aerobic performance, lower-body muscular power and upper-limb movement speed. Reference values of anthropometric and fitness dimensions are provided in order to be used by coaches, conditioning trainers and sport scientists when testing young male and female karatekas.

Strong evidence supports physical activity and fitness levels being positively associated with cognitive performance and overall academic performance in youth. This also applies to sports participation. However, whether participation in sports at the elite level is associated with greater academic performance remains unknown. Thus, the present study aimed to compare the academic performance of young elite athletes to that of control students, as well as to analyze whether the type of sport mediates these results. Between 2010 and 2019, all students from the last Baccalaureate course of the Spanish Elite Sport High School—which also includes non-elite athletes and recreational athlete students, who were categorized as controls—participated in this study. Academic performance was assessed through both the grade point average of the two last Baccalaureate courses and through the average grades from the University Entrance Examinations. Athletes were categorized attending to different sport classifications. A total of 1126 adolescents (570 girls, 18.2 ± 0.6 years) participated in the study, of which 483 and 643 were categorized as elite athletes and control students, respectively. Elite athletes attained a lower overall academic performance than controls (p < 0.001), which was confirmed for both sexes (p < 0.001). These differences were separately confirmed for most academic subjects (p < 0.05), as well as when attending to different sport classifications (all p > 0.05). Young elite athletes attained a lower academic performance than their non-elite peers, regardless of their type of sport. These findings highlight the importance of programs aimed at facilitating dual careers among young elite athletes.