Prospective associations between physical activity levels and white matter integrity in older adults: results from the MAPT study.

Background: Higher levels of physical activity (PA) are known to be associated with better white matter integrity measured by diffusion tensor imaging (DTI) in older adults in cross-sectional studies. However, no studies have investigated the association between PA levels and the evolution of DTI parameters (fractional anisotropy and mean diffusivity).

Objectives: To examine the cross-sectional associations between PA levels and DTI parameters, then to investigate the association between baseline PA levels and the evolution of DTI parameters in older adults.

Longitudinal associations of physical activity levels with morphological and functional changes related with aging: The MAPT study.

Introduction: The biological process of aging is characterized by molecular and physiological processes that lead to alterations in the organism. There is still a lack of a consensus about the measurement of biological aging, but physical activity (PA) could be a potential marker of an aging phenotype.

Methods: Measurements of body composition, muscle quality (MQ), blood biochemistry, and neurodegeneration were assessed over three years.

Relationships between physical activity across lifetime and health outcomes in older adults: Results from the NuAge cohort.

This study aims to (1) describe participation in four physical activity (PA) domains across life and (2) examine the influence of PA during adolescence, early, middle, and later adulthood on health variables at older age. This observational study was conducted in 1378 generally healthy older adults (age 67-84 at baseline in 2003-2005; 52% women) in Quebec, Canada. Using a modified version of the interviewer-administered Lifetime Total Physical Activity Questionnaire (LTPAQ) and life events calendar to facilitate the recall, participants reported the frequency, duration, and intensity of occupational (OPA), commuting (CPA), household (HPA), and leisure time (LTPA) they participated in at age 15, 25, 45, and 65, and at the first follow-up (age 68-85 in 2005-2006).

Effects of lifestyle interventions that include a physical activity component in class II and III obese individuals: a systematic review and meta-analysis.

Background: In class II and III obese individuals, lifestyle intervention is the first step to achieve weight loss and treat obesity-related comorbidities before considering bariatric surgery. A systematic review, meta-analysis, and meta-regression were performed to assess the impact of lifestyle interventions incorporating a physical activity (PA) component on health outcomes of class II and III obese individuals.

Methods: An electronic search was conducted in 4 databases (Medline, Scopus, CINAHL and Sportdiscus).

Pilot study: can older inactive adults learn how to reach the required intensity of physical activity guideline?

Most individuals do not reach the recommended physical activity level of at least 150 minutes of aerobic exercise (AE) at moderate-to-vigorous intensity per week. For example, only 13% of older Canadian adults reach World Health Organization physical activity guideline (PAG). One of the reasons might be a difficulty identifying the required intensity.