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Research note
Ian Cook
University of Limpopo Faculty of Health Sciences
Corresponding Author
ORCiD: https://orcid.org/0000-0001-5098-2936
License:
This work is licensed under a CC BY 4.0 License. Read Full License
View the published article at BMC Research Notes.
Objectives: To investigate the descriptive nature of objectively-measured, free-living sleep quantity and quality, and the relationship to adiposity, in a rural African setting in 145 adults (≥40 years, female: n=104, male: n=41). Wrist-mounted, triaxial accelerometry data was collected over nine days. Measures of sleep quantity and quality, and physical activity were extracted from valid minute-by-minute data. Adiposity indices were body-mass-index, waist circumference and conicity index. Self-reported data included behavioural, health and socio-demographic variables. Community consultation followed the quantitative data analyses, for validation and interpretation of findings.
Results: Females had more nocturnal sleep than males (7.2 vs. 6.8 hours/night, p=0.0464) while males recorded more diurnal sleep time (p=0.0290). Wake after sleep onset and number of awakenings were higher in females, and sleep efficiency was higher in males (p≤0.0225). Sleep indices were generally similar between weekdays and weekends, except for sleep fragmentation index (p=0.0458). Sleep quantity, but not sleep quality was independently and inversely associated with adiposity (p=0.0453). Physical activity and morbidity measures were significantly and consistently associated with sleep and adiposity measures (p<0.0458). The preliminary qualitative data suggests that future studies should include more detailed data around contextual issues of sleep (social, cultural, economic, environment).
Keywords
body composition, anthropometry, accelerometer, actigraphy, movement monitor, measurement
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CURRENT STATUS: Published
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Posted 11 Jun, 2020
Published
On 01 Jul, 2020
No community comments so far
Editorial decision: Accept
On 24 Jun, 2020
Reviewers invited
Invitations sent on 08 Jun, 2020
Editor assigned
On 06 Jun, 2020
Submission checks complete
On 05 Jun, 2020
Editor invited
On 05 Jun, 2020
No comments provided
Editorial decision: Major revision
On 26 May, 2020
Review #2 received
Received 25 May, 2020
Review #1 received
Received 23 Mar, 2020
Reviewer #2 agreed
On 09 Mar, 2020
First submitted
On 13 Feb, 2020
Editor assigned
On 13 Feb, 2020
Reviewers invited
Invitations sent on 13 Feb, 2020
Reviewer #1 agreed
On 13 Feb, 2020
Submission checks complete
On 12 Feb, 2020
Editor invited
On 12 Feb, 2020
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Subject Areas
Health Economics & Outcomes Research
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This preprint is under consideration at BMC Research Notes. A preprint is a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Learn more about In Review
Research note
Ian Cook
University of Limpopo Faculty of Health Sciences
Corresponding Author
ORCiD: https://orcid.org/0000-0001-5098-2936
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
Peer Review Timeline
CURRENT STATUS: Published
Version 2
Posted 11 Jun, 2020
Published
On 01 Jul, 2020
No community comments so far
Editorial decision: Accept
On 24 Jun, 2020
Reviewers invited
Invitations sent on 08 Jun, 2020
Editor assigned
On 06 Jun, 2020
Submission checks complete
On 05 Jun, 2020
Editor invited
On 05 Jun, 2020
No comments provided
Editorial decision: Major revision
On 26 May, 2020
Review #2 received
Received 25 May, 2020
Review #1 received
Received 23 Mar, 2020
Reviewer #2 agreed
On 09 Mar, 2020
First submitted
On 13 Feb, 2020
Editor assigned
On 13 Feb, 2020
Reviewers invited
Invitations sent on 13 Feb, 2020
Reviewer #1 agreed
On 13 Feb, 2020
Submission checks complete
On 12 Feb, 2020
Editor invited
On 12 Feb, 2020
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
Subject Areas
Health Economics & Outcomes Research
License:
This work is licensed under a CC BY 4.0 License. Read Full License
View the published article at BMC Research Notes.
Objectives: To investigate the descriptive nature of objectively-measured, free-living sleep quantity and quality, and the relationship to adiposity, in a rural African setting in 145 adults (≥40 years, female: n=104, male: n=41). Wrist-mounted, triaxial accelerometry data was collected over nine days. Measures of sleep quantity and quality, and physical activity were extracted from valid minute-by-minute data. Adiposity indices were body-mass-index, waist circumference and conicity index. Self-reported data included behavioural, health and socio-demographic variables. Community consultation followed the quantitative data analyses, for validation and interpretation of findings.
Results: Females had more nocturnal sleep than males (7.2 vs. 6.8 hours/night, p=0.0464) while males recorded more diurnal sleep time (p=0.0290). Wake after sleep onset and number of awakenings were higher in females, and sleep efficiency was higher in males (p≤0.0225). Sleep indices were generally similar between weekdays and weekends, except for sleep fragmentation index (p=0.0458). Sleep quantity, but not sleep quality was independently and inversely associated with adiposity (p=0.0453). Physical activity and morbidity measures were significantly and consistently associated with sleep and adiposity measures (p<0.0458). The preliminary qualitative data suggests that future studies should include more detailed data around contextual issues of sleep (social, cultural, economic, environment).
Figure 1
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