A life-course perspective on physical functioning in women.

Area of Science:

• Gerontology
• Public Health
• Epidemiology

Background:

• The Kalache & Kickbusch model posits that functional capacity peaks in early adulthood and declines with age.
• This decline is hypothesized to be dependent on an individual's fitness level, eventually reaching a "disability threshold".

Purpose of the Study:

• To validate the Kalache & Kickbusch model regarding functional capacity decline.
• To investigate the relationship between age, physical functioning, and the rate of decline.

Main Methods:

• Utilized data from the Australian Longitudinal Study on Women's Health (1996-2011).
• Assessed physical functioning using the Short Form (36) Health Survey.
• Modeled age-related physical functioning decline using spline regression, considering baseline physical functioning and physical activity levels.

Main Results:

• Physical functioning decline accelerates with age, with no decline observed in young adults but significant decline in older adults.
• The rate of decline was influenced by baseline physical functioning, with lower levels in younger/mid-aged cohorts and higher levels in the older cohort.
• The disability threshold was reached at a mean age of 79 years, with a wide range (45-88 years) depending on initial physical functioning and activity.

Conclusions:

• Age and physical decline are non-linearly related, with decline accelerating over time.
• Baseline physical functioning significantly influences the rate of physical decline.
• Physical activity level did not demonstrate a significant influence on the rate of decline.