Descriptive epidemiology of objectively-measured, free-living sleep parameters in a rural African setting.
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
This is a list of supplementary files associated with this preprint. Click to download.
Posted 11 Jun, 2020
On 01 Jul, 2020
On 24 Jun, 2020
Invitations sent on 08 Jun, 2020
On 06 Jun, 2020
On 05 Jun, 2020
On 05 Jun, 2020
On 26 May, 2020
Received 25 May, 2020
Received 23 Mar, 2020
On 09 Mar, 2020
On 13 Feb, 2020
On 13 Feb, 2020
Invitations sent on 13 Feb, 2020
On 13 Feb, 2020
On 12 Feb, 2020
On 12 Feb, 2020
Descriptive epidemiology of objectively-measured, free-living sleep parameters in a rural African setting.
Posted 11 Jun, 2020
On 01 Jul, 2020
On 24 Jun, 2020
Invitations sent on 08 Jun, 2020
On 06 Jun, 2020
On 05 Jun, 2020
On 05 Jun, 2020
On 26 May, 2020
Received 25 May, 2020
Received 23 Mar, 2020
On 09 Mar, 2020
On 13 Feb, 2020
On 13 Feb, 2020
Invitations sent on 13 Feb, 2020
On 13 Feb, 2020
On 12 Feb, 2020
On 12 Feb, 2020
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