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Title: The association between seven-day objectively measured habitual physical activity and 24 hr ambulatory blood pressure: the SABPA study
Authors: Hamer, Mark
Bruwer, Erna J.
de Ridder, J. Hans
Swanepoel, Mariëtte
Kengne, André P.
Cockeran, Marike
Malan, Leone
Keywords: Physical activity
Accelerometry measures
Actiheart
Blood pressure
Hypertension
Ethnic differences
Issue Date: 2017
Publisher: © Nature Publishing Group
Citation: HAMER, M. ... et al., 2017. The association between seven-day objectively measured habitual physical activity and 24 hr ambulatory blood pressure: the SABPA study. Journal of Human Hypertension (in press)
Abstract: Few studies have examined objective physical activity in relation to 24 hour ambulatory blood pressure (BP). We aimed to assess the association of seven-day objectively measured habitual physical activity with ambulatory BP in a sample of African and Caucasian school teachers (n=216, age 49.7 yrs) from the Sympathetic Activity and Blood Pressure in Africans prospective cohort study. Hypertension (ambulatory systolic BP≥130 and / or Diastolic BP≥80 mmHg) was prevalent in 53.2% of the sample, particularly in black Africans. The hypertensive group spent significantly more awake time in sedentary activity (51.5 vs. 40.8 % of waking hours, p=0.001), as well as doing less light (34.1 vs. 38.9%, p=0.043) and moderate- (14.0 vs. 19.7%, p=0.032) intensity activities compared with normotensives, respectively. In covariate adjusted models, light intensity activity time was associated with lower 24-hr and day-time ambulatory systolic BP (β=-0.15 ,95% CI: -0.26, -0.05, p=0.004; β=-0.14, -0.24, -0.03, p=0.011) and diastolic BP (β=-0.14, -0.25, -0.03, p=0.015; β=-0.13 ,-0.24, -0.01, p=0.030), as well as resting Systolic BP (β=-0.13 ,-0.24, -0.01, p=0.028). Sedentary time was associated only with 24 hr Systolic BP (β=0.12; 0.01, 0.22), which was largely driven by night time recordings. Participants in the upper sedentary tertile were more likely to be “non-dippers” (odds ratio=2.11, 95% CI, 0.99, 4.46, p=0.052) compared with the lowest sedentary tertile. There were no associations between moderate to vigorous activity and BP. In conclusion, objectively assessed daily light physical activity was associated with ambulatory BP in a mixed ethnic sample.
Description: This paper is embargoed until six months after publication.
Sponsor: The SABPA study is funded by the North-West University, the North West Education Department, the Medical Research Council of South Africa, the National Research Foundation, Roche Diagnostics, South Africa and the Metabolic Syndrome Institute, France
Version: Accepted for publication
URI: https://dspace.lboro.ac.uk/2134/23462
ISSN: 1476-5527
Appears in Collections:Closed Access (Sport, Exercise and Health Sciences)

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