Nonexercise movement in elderly compared with young people.

Area of Science:

• Gerontology
• Human Physiology
• Kinesiology

Background:

• The relationship between daily physical activity and aging is not fully understood.
• Nonexercise movement and nonexercise activity thermogenesis (NEAT) in the elderly remain understudied.

Purpose of the Study:

• To test the hypothesis that free-living nonexercise movement is lower in older adults compared to younger controls.
• To investigate differences in daily activity patterns and energy expenditure between age groups.

Main Methods:

• Ten healthy, sedentary elderly and 10 lean young adults, matched for lean body mass, participated.
• Sensitive technology monitored nonexercise movement and body posture over 10 days.
• Energy expenditure was assessed using doubly labeled water and indirect calorimetry.

Main Results:

• Elderly subjects showed significantly lower total nonexercise movement, standing time, and standing acceleration.
• This reduction was primarily due to elderly individuals walking shorter distances daily.
• No significant differences were found in basal metabolic rate, thermic effect of food, total daily energy expenditure, or NEAT between groups.

Conclusions:

• Lean, healthy older adults may exhibit a biological predisposition for lower activity levels.
• The energetic cost of walking may be higher in the elderly compared to younger individuals.
• Reduced daily physical activity in older adults warrants further investigation into its implications for health and aging.