Sleep and musculoskeletal pain

Area of Science:

• Sleep Medicine
• Rheumatology
• Neuroscience

Background:

• "Fibrositis syndrome" is characterized by chronic musculoskeletal pain and fatigue.
• This condition is associated with a specific sleep anomaly: alpha electroencephalographic (EEG) activity during non-rapid-eye-movement sleep, indicating a physiological arousal disorder.
• The sleep disturbance is described as nonrestorative, contributing to the persistence of symptoms.

Purpose of the Study:

• To explore the underlying mechanisms of "fibrositis syndrome."
• To identify factors contributing to pain and mood symptoms in this condition.
• To propose a more accurate descriptive term for this poorly understood rheumatic syndrome.

Main Methods:

• The study reviews existing literature and clinical observations regarding "fibrositis syndrome."
• It analyzes the association between sleep anomalies (alpha EEG during NREM sleep) and symptoms.
• It considers various potential mediating factors for pain and mood symptoms.

Main Results:

• Chronic musculoskeletal pain and fatigue are linked to a physiological arousal disorder during sleep, specifically an alpha EEG anomaly in non-rapid-eye-movement sleep.
• Symptoms may be influenced by diverse factors including psychologic distress, environmental stimuli, physiological disturbances (e.g., rheumatoid arthritis), and altered central nervous system metabolism (e.g., serotoninergic functions).
• The heterogeneity of causative agents highlights the complexity of the syndrome.

Conclusions:

• "Fibrositis syndrome" is characterized by nonrestorative sleep with a specific EEG arousal pattern.
• The syndrome's symptoms are modulated by a complex interplay of psychological, environmental, physiological, and metabolic factors.
• The term "rheumatic pain modulation disorder" is proposed to better describe this nonarticular rheumatic syndrome due to its multifaceted nature.