Independent and Opposing Associations of Habitual Exercise and Chronic PM2.5 Exposures on Hypertension Incidence
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AbstractBACKGROUND:
We investigated the joint associations of habitual physical activity (PA) and long-term exposure to fine particulate matter (PM2.5) with the development of hypertension in a longitudinal cohort in Taiwan.

METHODS:
We selected 140 072 adults (≥18 years of age) without hypertension who joined a standard medical screening program with 360 905 medical examinations between 2001 and 2016. PM2.5 exposure was estimated at each participant’s address using a satellite data-based spatiotemporal model with 1 km2 resolution. Information on habitual
PA and a wide range of covariates was collected using a standard self administered questionnaire. We used the Cox regression model with time dependent covariates to examine the joint associations.

RESULTS:
The mean age of all observations was 41.7 years, and 48.8% were male. The mean value for systolic and diastolic blood pressure was 112.5 and 68.7mm Hg, respectively. Approximately 34.2% of all observations were inactive (0 metabolic equivalence values-hours), 29.8% had moderate-PA (median [interquartile range]; 3.75 [3.38 to 4.38]
metabolic equivalence values-hours), and 36.0% had high-PA (15.7 [10.3 to 24.8] metabolic equivalence values-hours). The mean±SD of PM2.5 was 26.1±7.3 μg/m3. The prevalence of cardiovascular disease, diabetes mellitus,
and cancer was 2.1%, 2.9%, and 1.5%, respectively. After adjusting for a wide range of covariates (including a mutual adjustment for PA or PM2.5), a higher PA level was associated with a lower risk of hypertension (hazard
ratio [HR] for the moderate- and high-PA was 0.93 [95% CI, 0.89–0.97] and 0.92 [95% CI, 0.88–0.96], respectively, as compared with the inactive-PA), whereas a higher level of PM2.5 was associated with a higher risk of
hypertension (HR for the moderate- and high-PM2.5 was 1.37 [95% CI, 1.32–1.43] and 1.92 [95% CI, 1.81–2.04], respectively, as compared with the low-PM2.5 group]. No significant interaction was observed between PA
and PM2.5 (HR 1.01 [95% CI, 1.00–1.02]).

CONCLUSIONS:
A high-PA and low PM2.5 exposure were associated with a lower risk of hypertension. The negative association between PA and hypertension remained stable in people exposed to various levels of PM2.5, and the positive association between PM2.5 and hypertension was not modified by PA. Our results indicated that PA is a suitable hypertension prevention strategy for people residing in relatively polluted regions.
Acceptance Date10/06/2020
All Author(s) ListCui Guo, Yiqian Zeng, Ly-yun Chang, Zengli Yu, Yacong Bo, Changqing Lin, Alexis KH Lau, Tony Tam, Xiang Qian Lao
Journal nameCirculation
Year2020
Month8
Volume Number142
Issue Number7
PublisherAmerican Heart Association
Pages645 - 656
ISSN0009-7322
eISSN1524-4539
LanguagesEnglish-United Kingdom
Keywordsambient particulate matter, cohort studies, hypertension, physical activity, Taiwan

Last updated on 2021-15-09 at 00:02