Age-related changes in large muscle group movements during sleep

Area of Science:

• Sleep Medicine
• Neuroscience
• Human Aging

Background:

• Large muscle group movements (LMM) during sleep are common but their age-related changes and relationship with sleep architecture are not fully understood.
• Understanding these movements is crucial for characterizing normal sleep patterns across the lifespan.

Purpose of the Study:

• To investigate large muscle group movements (LMM) during sleep across the lifespan.
• To examine the relationship between LMM, sleep architecture (REM and NREM), and age.
• To establish normative data for LMM across different age groups.

Main Methods:

• 141 healthy participants across five age groups (children to older adults) underwent polysomnography (PSG).
• LMM, LMM associated with arousals (LMMA), and LMM associated with awakenings (LMMW) were scored.
• Statistical analyses compared LMM indices and durations between age groups and sleep stages (REM/NREM).

Main Results:

• LMM frequency (including LMMA and LMMW) significantly increased with age; older adults had the highest frequency.
• LMM duration was longer in younger individuals and shorter in older adults.
• LMM and LMMA were more prevalent in REM sleep for adults and older adults, suggesting age-related sleep fragmentation.

Conclusions:

• Sleep-related LMM exhibit distinct age-related trends, becoming more frequent and shorter in duration with advancing age.
• Increased LMM during REM sleep in older adults reflects age-related sleep instability.
• The study provides normative data for LMM and highlights their connection to sleep architecture changes throughout life.