Can actigraphy measure sleep fragmentation in children?

Area of Science:

• Pediatric Sleep Medicine
• Biomedical Engineering
• Sleep Research

Background:

• Polysomnography (PSG) is the gold standard for sleep quality assessment.
• Actigraphy is increasingly used as an ambulatory monitoring tool.
• Accurate measurement of sleep fragmentation is crucial in pediatric sleep assessment.

Purpose of the Study:

• To evaluate the effectiveness of actigraphy in measuring sleep fragmentation in children.
• To compare actigraphy-derived sleep fragmentation metrics with polysomnography (PSG) findings.
• To determine the diagnostic utility of actigraphy for sleep disordered breathing (SDB) in pediatric populations.

Main Methods:

• 130 children (aged 2-18 years) referred for sleep disordered breathing (SDB) assessment were included.
• Actigraphy's fragmentation index (FI) and number of wake bouts per hour were compared to the arousal index (AI) from PSG.
• Receiver operating characteristic (ROC) curves were used to assess classification accuracy.

Main Results:

• Actigraphy's fragmentation index (FI) showed fair ability to classify children with an arousal index (AI) >10 events/h (Area Under Curve [AUC] = 0.73).
• Actigraphy's wake bouts per hour metric demonstrated poor classification accuracy for AI >10 events/h (AUC = 0.67).
• These findings indicate limited accuracy of actigraphy in quantifying sleep arousal levels.

Conclusions:

• Actigraphy provides a fair but not definitive measure of sleep arousal in children.
• While actigraphy has limitations for diagnosing SDB, it remains valuable for monitoring sleep-wake schedules.
• Further research may refine actigraphy's role in pediatric sleep evaluation.