TAILIEUCHUNG - LONG-TERM FITNESS TRAINING IMPROVES THE CIRCADIAN REST-ACTIVITY RHYTHM IN HEALTHY ELDERLY MALES

Most of the early work on abuse of the elderly was limited to domestic settings and carried out in developed countries. In seeking explanations for elder abuse, researchers drew from the literature in the fields of psychology, sociology, gerontology and the study of family violence. To accommodate the complexity of elder abuse and the many factors associated with it, researchers have turned to the ecological model, which was first applied to the study of child abuse and neglect (24) and has been applied more recently to elder abuse (25, 26). The ecological model can take into account the interactions that take place across a number of systems. As described in Chapter 1, the. | Long-Term Fitness Training Improves the Circadian Rest-Activity Rhythm in Healthy Elderly Males Eus J. w. Van Someren 1 Cees Lijzenga Majid Mirmiran and Dick F. Swaab Graduate School Neurosciences Amsterdam Netherlands Institute for Brain Research Amsterdam Netherlands Graduate School Neurosciences Amsterdam Psychology Department University of Amsterdam Amsterdam Netherlands Abstract In old age the circadian timing system loses optimal functioning. This process is even accelerated in Alzheimer s disease. Because pharmacological treatment of day-night rhythm disturbances usually is not very effective and may have considerable side effects nonpharmacological treatments deserve attention. Bright light therapy has been shown to be effective. It is known from animal studies that increased activity or an associated process also strongly affects the circadian tuning system and the present study addresses the question of whether an increased level of physical activity may improve circadian rhythms in elderly. In the study 10 healthy elderly males were admitted to a fitness training program for 3 months. The circadian rest-activity rhythm was assessed by means of actigraphy before and after the training period and again 1 year after discontinuation. As a control for possible seasonal effects repeated actigraphic recordings were performed during the same times of the year as were the pre and post measurements in a control group of 8 healthy elderly males. Fitness training induced a significant reduction in the fragmentation of the rest-activity rhythm. Moreover the fragmentation of the rhythm was negatively correlated with the level of fitness achieved after the training. No seasonal effect was found. Previous findings in human and animal studies are reviewed and several possible mechanisms involved in the effect of fitness training on circadian rhythms are discussed. The results suggest that fitness training may be helpful in elderly people suffering from sleep problems .

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