Light-Intensity Physical Activity and Medical Multimorbidity

Area of Science:

• Public Health
• Epidemiology
• Gerontology

Background:

• Multimorbidity, defined as having two or more chronic diseases, is a growing public health concern.
• Previous research has primarily focused on moderate-to-vigorous physical activity (MVPA) and its impact on chronic disease.
• The role of light-intensity physical activity (LIPA) in relation to multimorbidity remains underexplored in national adult populations.

Purpose of the Study:

• To investigate the association between objectively measured LIPA and multimorbidity in a representative sample of US adults.
• To determine if LIPA is independently associated with the odds of having multiple chronic diseases.

Main Methods:

• Utilized data from the 2005-2006 National Health and Nutrition Examination Survey (N=2048).
• Assessed physical activity using accelerometry to objectively measure LIPA.
• Determined multimorbidity status through physician diagnoses and biometric screening.

Main Results:

• Each 60-minute/day increase in LIPA was associated with a lower multimorbidity index (βadjusted = -0.09, P < 0.001).
• Participants with higher LIPA had reduced odds of being multimorbid (ORadjusted = 0.87, P = 0.01).
• These associations remained significant after adjusting for potential confounders.

Conclusions:

• Objectively measured LIPA is independently associated with reduced odds of multimorbidity in US adults.
• Promoting LIPA, in addition to MVPA, could be a valuable strategy for preventing and managing multimorbidity.
• Findings highlight the importance of light activities in maintaining health and preventing multiple chronic conditions.