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Sleep Med. 2014 Dec;15(12):1586-9. doi: 10.1016/j.sleep.2014.07.010. Epub 2014 Sep 2.

Delayed sleep timing is associated with low levels of free-living physical activity in normal sleeping adults.

Author information

1
New York Obesity Research Center, Columbia University, New York, NY, USA.
2
New York Obesity Research Center, Columbia University, New York, NY, USA. Electronic address: ms2554@columbia.edu.

Abstract

OBJECTIVE AND BACKGROUND:

We and others have reported that experimentally induced short sleep does not affect resting metabolic rate and leads to increased laboratory-measured 24-h energy expenditure. Here, we aimed to determine if sleep timing and/or quality are related to physical activity (PA) levels.

METHODS:

Measures of PA via waist actigraphy, sleep diary, and sleep quality questionnaires were collected over a 7-18-day period in 22 adults (mean age ± standard deviation (SD): 35.8 ± 4.6 years, and mean body mass index ± SD: 23.8 ± 1.1 kg/m(2)) who were on their habitual sleep-wake and activity schedules.

RESULTS:

During the recording period, mean (±SD) bedtime and wake times were 00:17 ± 1:07 h (range: 22:02-02:07 h) and 08:20 ± 1:14 h (range: 06:30-10:11 h), respectively. After controlling for sleep duration, later bedtime, wake time, and midpoint of sleep were associated with less time spent in moderate-to-vigorous PA (p = 0.013, p = 0.005, and p = 0.007, respectively), and increased time in sedentary PA (p = 0.016, p = 0.013, and p = 0.013, respectively).

CONCLUSIONS:

Current results suggest that even relatively small alterations in sleep timing may influence PA. However, causality cannot be inferred from this cross-sectional study. Clinical intervention studies should be conducted to assess the relationship between sleep timing and energy balance.

TRIAL REGISTRATION:

ClinicalTrials.gov NCT00935402.

KEYWORDS:

Accelerometry; Chronotype; Obesity; Physical activity; Sleep quality; Sleep timing

PMID:
25311835
PMCID:
PMC4260995
DOI:
10.1016/j.sleep.2014.07.010
[Indexed for MEDLINE]
Free PMC Article

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