Format

Send to

Choose Destination
Sleep. 2012 Apr 1;35(4):513-7. doi: 10.5665/sleep.1736.

Ambient temperature and obstructive sleep apnea: effects on sleep, sleep apnea, and morning alertness.

Author information

1
Department of Internal Medicine, Umeå University, Umeå, Sweden. Fredrik.Valham@Lung.Umu.Se

Abstract

STUDY OBJECTIVES:

The aim of the study was to investigate the effect of ambient temperature on sleep, sleep apnea, and morning alertness in patients with obstructive sleep apnea.

DESIGN:

Randomized controlled trial.

SETTING:

In-hospital investigations.

PARTICIPANTS:

Forty patients with obstructive sleep apnea naïve to treatment, with an apnea-hypopnea index of 10-30.

INTERVENTIONS:

Three different nights in room temperatures of 16°C, 20°C, and 24°C.

MEASUREMENTS:

Overnight polysomnography and Karolinska Sleepiness Scale.

RESULTS:

The obstructive apnea-hypopnea index was 30 ± 17 at 16°C room temperature, 28 ± 17 at 20°C, and 24 ± 18 at 24°C. The obstructive apnea-hypopnea index was higher at 16°C room temperature versus 24°C (P = 0.001) and at 20°C room temperature versus 24°C (P = 0.033). Total sleep time was a mean of 30 min longer (P = 0.009), mean sleep efficiency was higher (77 ± 11% versus 71 ± 13% respectively, P = 0.012), and the patients were significantly more alert according to the Karolinska Sleepiness Scale (P < 0.028) in the morning at 16°C room temperature versus 24°C. The amount of sleep in different sleep stages was not affected by room temperature.

CONCLUSIONS:

Untreated patients with obstructive sleep apnea sleep longer, have better sleep efficiency, and are more alert in the morning after a night's sleep at 16°C room temperature compared with 24°C, but obstructive sleep apnea is more severe at 16°C and 20°C compared with 24°C.

CLINICAL TRIAL INFORMATION:

This study is registered in ClinicalTrials.gov number NCT00544752.

KEYWORDS:

Sleep apnea syndromes; ambient temperature; daytime sleepiness; polysomnography; randomized controlled trial; sleep quality; sleep stages; sleep time; treatment

PMID:
22467989
PMCID:
PMC3296793
DOI:
10.5665/sleep.1736
[Indexed for MEDLINE]
Free PMC Article

Supplemental Content

Full text links

Icon for Silverchair Information Systems Icon for PubMed Central
Loading ...
Support Center