Symptom variability, affect and physical activity in ambulatory persons with multiple sclerosis: Understanding...

Area of Science:

• Neurology
• Rehabilitation Science
• Psychology

Background:

• Multiple sclerosis (MS) presents a highly variable clinical course.
• Daily symptom fluctuations significantly impact functional ability and quality of life in MS patients.
• The interrelationships between MS symptoms and physical/psychological health remain unclear.

Purpose of the Study:

• To explore variability patterns in multiple sclerosis (MS).
• To investigate time-bound relationships across symptoms, affect, and physical activity in individuals with MS.
• To understand the dynamic interplay of factors influencing daily life in MS.

Main Methods:

• Employed a multivariate, replicated, single-subject repeated-measures (MRSRM) design with four MS participants.
• Collected daily self-report data on mood, fatigue, pain, balance confidence, and balance losses over 28 days.
• Utilized accelerometry for daily physical activity measurement and dynamic factor analysis (DFA) to analyze variable relationships.

Main Results:

• Revealed person-specific models demonstrating significant time-dependent co-variation patterns.
• Identified considerable variation in these patterns across different subjects.
• Observed distinct variability structures correlating with varying levels of disability.

Conclusions:

• Modeling person-level variability is crucial for understanding MS heterogeneity.
• Highlights the importance of temporal and dynamic interrelationships among symptoms, affect, and health outcomes in MS.
• Suggests personalized approaches may benefit individuals with multiple sclerosis.