[The effects of daily physical activity on QOL in the elderly].

Objective: To ascertain the meaning and the influence of daily physical activity on QOL among the elderly, we surveyed their lifestyle exercise habits, cross-sectionally and longitudinally.

Methods: The subjects of this study were all residents living in a certain suburb of Nagoya-city, aged 63, 68, 73, 78, 83 years of age. They answered questionnaires regarding their exercise, physical activity, and QOL with six categories. The same questionnaire survey was conducted again 3 years later, and 958 people who answered both of them were examined in this study. The three-year-trend for physical activities, exercise habits and QOL scores, were analyzed and a comparison of QOL was made between the first and third year data based on the primary physical-activity-scores. In addition we applied logistic regression analysis to investigate the influence of physical activity changes (independent variable) on maintaining or improving of QOL scores (dependent variable).

Results: Daily physical activities were well maintained, but the percentage of feasible activities decreased by 5-10% as the sample population aged. On the other hand, 20 to 30% of the subjects increased their physical activity. The more people moved, the higher the QOL scores they had in both cross-sectional and longitudinal analyses. According to the logistic regression analysis, baseline physical activity habits positively contributed to most QOL change, increase in exercise tending to maintain or improve the QOL scores.

Conclusions: Daily physical activity was relatively well maintained among the sample population, and some increased their physical activity scores over the period studied. Those with high values had better physical conditions and a consistently high QOL. These results suggest that maintaining or increasing physical activity positively influences QOL in the elderly.