Determinants of cognitive decline in older European men

In our ageing population, the number of persons with cognitive impairment, dementia and Alzheimer's disease still increase and cause many problems for the elderly themselves, their relatives and caregivers and for health care. Therefore, the need for preventive action is high. In this thesis we identified social, lifestyle and dietary risk factors for the postponement of cognitive impairment and decline in elderly European men.For the results presented in this thesis, data from theFinland,Italyand the Netherlands Elderly (FINE) Study were used. This prospective population-based cohort study was carried out between 1985 and 2000 among 2,285 Finnish, Italian and Dutch men bornbetween 1900 - 1920. Cognitive functioning was measured with the Mini-Mental State Examination (MMSE).In the FINE Study, cognitive functioning decreased on average with 1.5 points during the 10-year follow-up period. This decline was due to an age effect, but also to a period and birth cohort effect.Men who were married or who lived with others during five years had at least a two times smaller subsequent 10-year cognitive decline compared with men who lost a partner, who were unmarried, who started to live alone and who lived alone during these five years.Cognitive decline did not differ among men with a high or low duration of physical activity at baseline. However, men who participated in activities with at leasta medium-low intensity had a 1.8 to 3.5 times smaller cognitive decline compared with men who participated in activities with lowest intensity. Moreover, a decrease in duration or intensity of physical activity resulted respectively in a 2.6 or 3.6 times stronger cognitive decline than maintaining duration or intensity.Men who consumed coffee had a two times smaller 10-year cognitive decline than non-consumers. In addition, an inverse and J-shaped association between the number of cups of coffee per day consumed and 10-year cognitive decline was present, with the least decline for men consuming three cups of coffee per day.Fish consumers had significantly less 5-year subsequent cognitive decline than non-consumers. A linear trend was observed for the relation between the intake of the n-3 fatty acids EPA + DHA and cognitive decline. An average difference of about 380 mg/day in EPA + DHA intake was associated with a 1.1 points difference in cognitive decline.Men whose cognition decreased between 1990 and 1995 had a twofold higher risk of dying in the following five years compared with men whose cognition was stable. Mortality risk of men whose cognition improved between 1995 and 2000 was not different from men with a stable cognition. The associations between marital status, living situation and physical activity are strong and provide in combination with the existing literature enough evidence for justifying public health recommendations for postponing cognitive decline. However, our findings on coffee and fish consumption and on the intake of the fatty acids EPA + DHA in relation with cognitive functioning need confirmation in other studies

Investigation of long-term hurricane activity

This paper presents a new approach of applying numerical methods to model storm processes. A storm empirical track technique is utilized to simulate the full tracks of hurricanes, starting with their initial points over the sea and ending with their landfall locations or final dissipations. The theoretical framework was first described in the literature by Vickery et al. (2000) and is extended in this study by introducing a new formula and several substantial adjustments. The results show acceptable accuracy, even if the input data are for a short period. For the Vietnam area, the research successfully generates a large database of synthetic storm tracks on the basis of a limited historical track record and a local climatological variable (i.e. sea surface temperature). The model is evaluated through the comparisons between the key storm statistics derived from the observed and simulated data over the entire research area (i.e. the South China Sea). In addition, some possible applications of this method to coastal structure design and coastal risk assessment are proposed.Hydraulic EngineeringCivil Engineering and Geoscience

Physical activity in relation to cognitive decline in elderly men: the FINE study

BACKGROUND: Physical activity may be associated with better cognition. OBJECTIVE: To investigate whether change in duration and intensity of physical activity is associated with 10-year cognitive decline in elderly men. METHODS: Data of 295 healthy survivors, born between 1900 and 1920, from the Finland, Italy, and the Netherlands Elderly (FINE) Study were used. From 1990 onward, physical activity was measured with a validated questionnaire for retired men and cognitive functioning with the Mini-Mental State Examination (maximum score 30 points). RESULTS: The rates of cognitive decline did not differ among men with a high or low duration of activity at baseline. However, a decrease in activity duration of >60 min/day over 10 years resulted in a decline of 1.7 points (p <0.0001). This decline was 2.6 times stronger than the decline of men who maintained their activity duration (p = 0.06). Men in the lowest intensity quartile at baseline had a 1.8 (p = 0.07) to 3.5 (p = 0.004) times stronger 10-year cognitive decline than those in the other quartiles. A decrease in intensity of physical activity of at least half a standard deviation was associated with a 3.6 times stronger decline than maintaining the level of intensity (p = 0.003). CONCLUSIONS: Even in old age, participation in activities with at least a medium-low intensity may postpone cognitive decline. Moreover, a decrease in duration or intensity of physical activity results in a stronger cognitive decline than maintaining duration or intensit

Hurricane risk assessment in a long temporal scale

Hydraulic EngineeringCivil Engineering and Geoscience