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Physical Activity Minimum Threshold Predicting Improved Function in Adults With Lower-Extremity Symptoms.

Dorothy D Dunlop¹, Jing Song¹, Jungwha Lee¹

¹Northwestern University Feinberg School of Medicine, Chicago, Illinois.

Arthritis Care & Research

|December 29, 2016

Summary

This summary is machine-generated.

For adults with lower-extremity joint pain, 45 weekly minutes of moderate-vigorous physical activity can improve or maintain high function. This is less than the 150-minute guideline but offers a reachable goal.

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Area of Science:

Gerontology and Rehabilitation Science
Biomedical Engineering and Biomechanics
Public Health and Preventive Medicine

Background:

Symptomatic lower-extremity joint pain affects function in older adults.
Current physical activity guidelines may not be optimal for this population.
Identifying a minimum effective physical activity threshold is crucial.

Purpose of the Study:

To determine an evidence-based minimum physical activity threshold for maintaining or improving function in adults with lower-extremity joint symptoms.
To compare the effectiveness of different physical activity metrics in predicting functional outcomes.

Main Methods:

Prospective study of 1,629 adults (age ≥49) with symptomatic lower-extremity joint pain.
Accelerometer data and clinical assessments were collected over 2 years.
Classification trees were used to identify optimal physical activity thresholds.

Main Results:

45 total moderate-vigorous (MV) minutes per week predicted improved or sustained high function.
This threshold showed a higher relative risk for improved gait speed and patient-reported physical function compared to less active individuals.
The identified threshold was consistent across various demographic and clinical subgroups.

Conclusions:

A minimum threshold of 45 total MV minutes per week is recommended to promote function in adults with lower-extremity joint symptoms.
This threshold is less demanding than the federal guideline of 150 MV-bout minutes per week.
It serves as an achievable intermediate goal for this population.