Considerable research on osteoporosis has recently focused on the prevention of bone loss in the later years. Researchers and clinicians are now able to accurately measure the effects of therapies and preventive strategies on the skeleton. It has been suggested that regular physical activity will be one of the valuable strategies in maintaining bone density and preventing osteoporosis. This paper will review the quantitative techniques available for bone density assessment and provide an overview of the recent cross-sectional and longitudinal studies related to the potential benefits of physical activity on the aging skeleton.

This investigation measured the physical fitness and anthropometrie parameters of a sample of 100 Saskatchewan women and men, aged 65 to 75 years. Subjects were grouped by age (65–69 years and 70–75 years) and these data were compared to the results from the Canada Fitness Survey (CFS) for women and men aged 65 to 69 years. In general, the Saskatchewan women in this study demonstrated an age-associated decline in the fitness and anthropometric variables measured. The Saskatchewan men, aged 65–69 years were significantly poorer in four variables (weight, sum of trunk skinfolds, Body Mass Index (BMI) and Maximal Oxygen Uptake (V02 MAX)) compared to the age-matched men tested in the CFS. However, the Saskatchewan men, aged 70–75 were not significantly different from the younger CFS subjects for these variables. Within limitations of the cross-sectional design, the results of this study indicate that Saskatchewan men in their early retirement years may require particular attention and further study with respect to their physical activity behaviour and fitness.

This article focusses on the likelihood of senior centre participation, the frequency of attendance among participants, changes in use/non-use over a four-year period, and associated characteristics. The data are from a longitudinal study conducted in Winnipeg and eight smaller Manitoba communities, with 1,399 individuals aged 65 and older interviewed in 1991/92 and 956 re-interviewed in 1995. About one in five individuals attended a senior centre in the six months prior to the interview, with a wide range among participants in the number of visits. Only 8 per cent joined a senior centre and 13 per cent ceased their participation over the four years. The influence of socio-demographic characteristics, health status, and social integration varied depending on the measure of participation and according to place of residence. Social factors, such as living arrangement, tended to be more important than health status. Directions for future research are discussed.