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The influence of age and sex on sleep latency in the MSLT-30--a normative study
Peter Geisler1, Ferenc Tracik, Tatjana Crönlein
1Sleep Disorders and Research Centre, Department of Psychiatry and Psychotherapy, University of Regensburg, Regensburg, Germany. peter.geisler@medbo.de
Study Objectives:
The Multiple Sleep Latency Test-30 (MSLT-30) is a variation of the Multiple Sleep Latency Test with a fixed duration of 30 minutes for each of 5 test sessions. It requires less effort for reliable recording and is not susceptible to on-line scoring errors. The aim of the study was to provide normative data for the clinical use of the MSLT-30 and to evaluate the influence of age, sex, and other sociodemographic variables.
Design:
An MSLT-30, along with measures of mood, objective, and subjective sleepiness was performed in a sample of healthy subjects in a balanced quota design.
Setting:
Sleep laboratory in a sleep disorders center.
Participants:
One hundred subjects with no complaint of sleep disturbance or daytime sleepiness, 10 men and 10 women each from 5 age decades from 20 to 69 years.
Interventions:
None.
Results:
Mean latency to sleep stage 1 or any other sleep stage was 13.9 +/- 6.9 minutes. The SL-30 showed a clear quadratic association with age, with the shortest latencies in the middle age groups. No correlation was found between the mean latency to sleep stage 1 or any other sleep stage and sociodemographic variables or other measures of daytime sleepiness (Epworth Sleepiness Scale, vigilance test), mood scales, sleep quality (Pittsburgh Sleep Quality Index), and amount of prior sleep.
Conclusions:
Sleep latencies in normal subjects are age dependent in a quadratic fashion, with a minimum in middle-aged subjects. This reconciles the findings of a long mean sleep latency in the MSLT of adolescents and of an increase on the mean sleep latency with age in adults.
Insights
The Multiple Sleep Latency Test-30 (MSLT-30) reveals sleep latency is age-dependent, with middle-aged adults showing the shortest sleep durations. This study provides normative data for the MSLT-30, essential for diagnosing sleep disorders.
Area of Science:
- Sleep Medicine
- Neuroscience
- Clinical Psychology
Background:
- The Multiple Sleep Latency Test-30 (MSLT-30) is a standardized 30-minute sleep test.
- It offers a reliable and less error-prone alternative to traditional MSLT protocols.
- Understanding normative sleep latency data is crucial for clinical diagnosis.
Purpose of the Study:
- To establish normative data for the MSLT-30 in a healthy adult population.
- To investigate the impact of age, sex, and sociodemographic factors on MSLT-30 results.
- To evaluate the MSLT-30's utility in clinical settings.
Main Methods:
- A cohort of 100 healthy adults (20-69 years) underwent the MSLT-30.
- Participants completed measures of mood, subjective and objective sleepiness, and sleep quality.
- A balanced quota design ensured representation across age and sex demographics.
Main Results:
- Mean sleep latency on the MSLT-30 was 13.9 ± 6.9 minutes.
- Sleep latency exhibited a quadratic relationship with age, peaking in middle age.
- No significant correlations were found between sleep latency and other measured variables.
Conclusions:
- Normal sleep latency follows a quadratic age-dependent pattern, with a minimum in middle age.
- These findings help reconcile previous MSLT data across different age groups.
- The MSLT-30 provides valuable normative data for assessing sleepiness.
