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Open Access Research article

Occupational and leisure time physical activity in contrasting relation to ambulatory blood pressure

Els Clays1*, Dirk De Bacquer1, Koen Van Herck1, Guy De Backer1, France Kittel2 and Andreas Holtermann3

Author affiliations

1 Department of Public Health, Ghent University, University Hospital, (2) Block A, De Pintelaan 185, B-9000, Ghent, Belgium

2 Department of Epidemiology and Health Promotion, School of Public Health, Université Libre de Bruxelles, Campus Erasmus CP 596, route de Lennik 808, B-1070, Brussels, Belgium

3 National Research Centre for the Working Environment, Lersø Parkallé 105, DK-2100, Copenhagen, Denmark

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Citation and License

BMC Public Health 2012, 12:1002  doi:10.1186/1471-2458-12-1002

Published: 20 November 2012

Abstract

Background

While moderate and vigorous leisure time physical activities are well documented to decrease the risk for cardiovascular disease, several studies have demonstrated an increased risk for cardiovascular disease in workers with high occupational activity. Research on the underlying causes to the contrasting effects of occupational and leisure time physical activity on cardiovascular health is lacking. The aim of this study was to examine the relation of objective and self-report measures of occupational and leisure time physical activity with 24-h ambulatory systolic blood pressure (BP).

Methods

Results for self-reported physical activity are based on observations in 182 workers (60% male, mean age 51 years), while valid objective physical activity data were available in 151 participants. The usual level of physical activity was assessed by 5 items from the Job Content Questionnaire (high physical effort, lifting heavy loads, rapid physical activity, awkward body positions and awkward positions of head or arms at work) and one item asking about the general level of physical activity during non-working time. On a regular working day, participants wore an ambulatory BP monitor and an accelerometer physical activity monitor during 24 h. Associations were examined by means of Analysis of Covariance.

Results

Workers with an overall high level of self-reported occupational physical activity as well as those who reported to often lift heavy loads at work had a higher mean systolic BP at work, at home and during sleep. However, no associations were observed between objectively measured occupational physical activity and BP. In contrast, those with objectively measured high proportion of moderate and vigorous leisure time physical activity had a significantly lower mean systolic BP during daytime, while no differences were observed according to self-reported level of leisure time physical activity.

Conclusions

These findings suggest that workers reporting static occupational physical activities, unlike general physically demanding tasks characterized by dynamic movements of large muscle groups, are related to a higher daily systolic BP, while high objective levels of moderate and vigorous leisure time physical activity are related to lower daytime systolic BP. Ambulatory systolic BP may be a physiological explanatory factor for the contrasting effects of occupational and leisure time physical activity.

Keywords:
Physical activity; Occupational; Blood pressure