Treadmill exercise testing in an epidemiologic study of elderly subjects.

Area of Science:

• Gerontology
• Exercise Physiology
• Cardiovascular Health

Background:

• Understanding physical performance in aging populations is crucial for health and fitness.
• Establishing normative data for exercise responses in older adults is essential for clinical and research applications.
• Community-based studies provide valuable insights into the health of diverse aging populations.

Purpose of the Study:

• To characterize the physical performance of older subjects in a community-based study.
• To establish norms of oxygen consumption (VO2) during exercise in individuals aged 55-94.
• To investigate age and sex differences in exercise capacity and factors influencing them.

Main Methods:

• A community-based census identified 3057 individuals; 2092 participated.
• 1101 healthy subjects (55-94 years) underwent treadmill exercise testing using the Cornell protocol.
• Maximal exercise was defined by a respiratory exchange ratio (RER) ≥ 1.10; peak oxygen consumption (VO2) was measured.

Main Results:

• 73.8% of women and 89.5% of men achieved a minimal exercise workload (RER ≥ 1.00).
• 32.9% of women and 52.7% of men achieved maximal exercise (RER ≥ 1.10).
• Peak VO2/kg/min decreased linearly with age for both sexes; sex differences were explained by body composition (body fat percentage).

Conclusions:

• This study provides community-based data on exercise participation and maximal exercise achievement in older adults.
• Exercise duration, peak VO2, and heart rate declined with age.
• Sex differences in peak VO2 are largely attributable to differences in body fat percentage, not lean body mass.