Pathological and Non-pathological Aging, Physical Activity, Genotype and Cognition

Several epidemiologic studies conducted in North America and in Europe have shown that the regular practice of physical activity, in opposition to a sedentary life, is associated with a reduced risk of developing neurodegenerative diseases such as AD. These results have been strengthened by cross-sectional and interventional studies, which have shown that physical activity slows down the decline of cognitive functions typically observed in normal and pathological aging and retards the onset of dementia. The positive effects of chronic exercise on cerebral and cognitive ageing are now recognised by scientists and clinicians; however, the mechanisms underlying these effects in humans are poorly understood and there is a real need for randomised controlled trial (RCT) on this topic. The objective of this research project is to understand the compensatory mechanisms that may account for the positive effects of regular physical activity on pathological and non-pathological cerebral ageing in human and in particular in people presenting prodromal AD. All participants will be separated into six groups corresponding to the combination of two independent variables: the population type (aged people without any neurological disease vs. prodromal Alzheimer's disease participants) and the type of physical activity program they will follow during six months (aerobic and strength exercise program, stretching and balance program, or maintaining sedentary life style). Cognitive performance, cardiovascular health, brain integrity and cerebral functioning will be assessed at two or three different times: before the onset of the training program (pre-test), at the end of the training period (post-test 1) and six months after the end of the training program (post-test 2).

Inclusion criteria

• Aged between 60 and 80 years
• Retired
• Complete autonomy on the following four instrumental activities of daily living scales (IADL) : ability to use telephone, mode of transportation, responsibility for own medications and ability to handle finances, level of physical activity practice ≤ 2
• 18.5 ≤ BMI < 40
• MMSE ≥ 25
• For prodromal Alzheimer Disease patients : subjective memory complaints of the participant, objective evidence of impaired encoding in episodic memory (Grober-Buschke free recall score < 17).

Exclusion criteria

• Presence of a counter-indication for Magnetic Resonance Imaging , presence of a counter-indication for Positron Emission TomographyScan with [18F]-Flutemetamol, presence of any health problem preventing travel to the imaging service of the University Hospital, being under the legal guardianship of another person or being unable to provide consent to participate