The relationship between accelerometer-based physical activity, sedentary behavior, and seven common geriatric...

Area of Science:

• Gerontology
• Genetics
• Epidemiology

Background:

• Geriatric syndromes (GSs) pose significant health challenges for older adults.
• Understanding the causal factors influencing GSs is crucial for developing effective interventions.
• Physical activity (PA) and sedentary behavior (SB) are modifiable lifestyle factors with potential impacts on health outcomes.

Purpose of the Study:

• To investigate the potential causal associations between accelerometer-based physical activity (PA) and sedentary behavior (SB) with seven common geriatric syndromes (GSs) using Mendelian randomization (MR).
• To explore the specific relationships between different types of PA and SB and conditions such as frailty, falls, delirium, urinary incontinence, dysphagia, hearing loss, and visual impairment.

Main Methods:

• Utilized Mendelian randomization (MR) analysis with instrumental variables from genome-wide association studies.
• Examined three PA phenotypes (average acceleration, overall activity, moderate-intensity activity) and one SB phenotype as exposures.
• Applied the inverse variance weighted (IVW) method for primary analysis, supplemented by sensitivity, pleiotropy, and heterogeneity analyses to ensure result robustness.

Main Results:

• Genetically predicted moderate-intensity PA was associated with a reduced risk of urinary incontinence, hearing loss, and visual impairment.
• Higher overall activity and average acceleration were linked to a lower risk of frailty and delirium.
• Sedentary behavior (SB) showed a causal correlation with an increased risk of frailty, falls, and dysphagia.

Conclusions:

• Accelerometer-based physical activity (PA) demonstrates a potential causal relationship in lowering the risk of several geriatric syndromes (GSs).
• Sedentary behavior (SB) is causally associated with an elevated risk of developing common GSs.
• These findings support the importance of promoting physical activity and reducing sedentary time in geriatric populations to mitigate syndrome development.