Cardiovascular fitness is associated with cognition in young adulthood.

During early adulthood, a phase in which the central nervous system displays considerable plasticity and in which important cognitive traits are shaped, the effects of exercise on cognition remain poorly understood. We performed a cohort study of all Swedish men born in 1950 through 1976 who were enlisted for military service at age 18 (N = 1,221,727). Of these, 268,496 were full-sibling pairs, 3,147 twin pairs, and 1,432 monozygotic twin pairs. Physical fitness and intelligence performance data were collected during conscription examinations and linked with other national databases for information on school achievement, socioeconomic status, and sibship. Relationships between cardiovascular fitness and intelligence at age 18 were evaluated by linear models in the total cohort and in subgroups of full-sibling pairs and twin pairs. Cardiovascular fitness, as measured by ergometer cycling, positively associated with intelligence after adjusting for relevant confounders (regression coefficient b = 0.172; 95% CI, 0.168-0.176). Similar results were obtained within monozygotic twin pairs. In contrast, muscle strength was not associated with cognitive performance. Cross-twin cross-trait analyses showed that the associations were primarily explained by individual specific, non-shared environmental influences (> or = 80%), whereas heritability explained < 15% of covariation. Cardiovascular fitness changes between age 15 and 18 y predicted cognitive performance at 18 y. Cox proportional-hazards models showed that cardiovascular fitness at age 18 y predicted educational achievements later in life. These data substantiate that physical exercise could be an important instrument for public health initiatives to optimize educational achievements, cognitive performance, as well as disease prevention at the society level.

End-of-life in a Swedish population: demographics, social conditions and characteristics of places of death.

The objectives of this study were to identify and describe the demographics and social conditions as well as characteristics of the places of death in a randomly selected sample that died in a county in Sweden during 2001. The present study reports part of the findings from a larger study undertaken during 2003 using a survey design of retrospective reviews of death certificates, medical records, and nursing records. Among several noteworthy findings are: first, an examination of these individuals' living arrangements reveal not only a large and vulnerable group that lives alone at the end-of-life but also a group living separated from their partners near end-of-life; second, individuals differ with respect to residence prior to death, that is private homes versus residential care facilities, imparting highly different contexts of care at the end-of-life; and third, a high prevalence of institutionalized deaths demonstrates that places of death other than hospitals and residential care facilities are uncommon, if not rare. It is concluded that increased attention to the social circumstances of the time period surrounding individuals' at the end-of-life is essential. There is need to develop more integrated models of care for dying people. Contemporary services available are not designed to meet a wide range of peoples' needs at the end-of-life. Home-based care, residential care and hospital care must be adapted to the changing patterns of dying. The services available should be organized to the benefit of the users rather than around the providers. This is the first study of its kind of a Swedish sample and while the data are limited to one county in Sweden its findings may contribute to a deeper understanding of demographic and social patterns at the end-of-life in general.