Bidirectional Associations between Handgrip Strength and Depressive Symptoms: A Longitudinal Cohort Study

Area of Science:

• Gerontology
• Epidemiology
• Mental Health Research

Background:

• Handgrip strength is a key indicator of physical function and overall health.
• Depressive symptoms are a significant public health concern, particularly among older adults.
• Understanding the interplay between physical and mental health is crucial for developing effective interventions.

Purpose of the Study:

• To investigate the bidirectional relationship between handgrip strength and depressive symptoms.
• To examine the dose-response patterns in these associations within a large, nationally representative sample.

Main Methods:

• Utilized data from 13,208 participants in the China Health and Retirement Longitudinal Study (CHRLS).
• Employed a 4-year follow-up cohort design.
• Assessed depressive symptoms using the Center for Epidemiological Studies-Depression Scale (CES-D) and analyzed associations using generalized estimating equations and restricted cubic spline models.

Main Results:

• Lower handgrip strength was associated with an increased risk of subsequent depressive symptoms (OR 1.36 in the lowest vs. highest quartile).
• A linear dose-response relationship was observed: a 5-unit increase in handgrip strength correlated with an 11% decrease in depressive symptom risk (OR 0.89).
• Depressive symptoms were prospectively associated with decreased handgrip strength (β = -0.84), with an L-shaped dose-response pattern.

Conclusions:

• Confirmed bidirectional associations between handgrip strength and depressive symptoms.
• Highlighted dose-response relationships, indicating that improvements in one area may positively impact the other.
• Supports the development of integrated interventions targeting both physical strength and mental well-being.