Original Article

International Journal of Obesity (2017) 41, 689–696; doi:10.1038/ijo.2017.30; published online 7 March 2017

Clinical Studies and Practice

Time spent in sedentary posture is associated with waist circumference and cardiovascular risk

W W Tigbe1, M H Granat2, N Sattar3 and M E J Lean4

  1. 1Division of Health Science, Warwick Medical School, University of Warwick, Coventry, UK
  2. 2School of Health Sciences, Brian Blatchford Building, University of Salford, Salford, UK
  3. 3Institute of Cardiovascular and Medical Sciences, BHF Glasgow Cardiovascular Research Centre, University of Glasgow, Glasgow, UK
  4. 4School of Medicine, Life-Course Nutrition and Health, University of Glasgow, Glasgow, UK

Correspondence: Dr WW Tigbe, Division of Health Science, Warwick Medical School, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL UK. Email: W.W.Tigbe@warwick.ac.uk

Received 8 July 2016; Revised 14 January 2017; Accepted 22 January 2017
Accepted article preview online 31 January 2017; Advance online publication 7 March 2017

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Abstract

Background:

 

The relationship between metabolic risk and time spent sitting, standing and stepping has not been well established. The present study aimed to determine associations of objectively measured time spent siting, standing and stepping, with coronary heart disease (CHD) risk.

Methods:

 

A cross-sectional study of healthy non-smoking Glasgow postal workers, n=111 (55 office workers, 5 women, and 56 walking/delivery workers, 10 women), who wore activPAL physical activity monitors for 7 days. Cardiovascular risks were assessed by metabolic syndrome categorisation and 10-year PROCAM (prospective cardiovascular Munster) risk.

Results:

 

Mean (s.d.) age was 40 (8) years, body mass index 26.9 (3.9)kgm−2 and waist circumference 95.4 (11.9)cm. Mean (s.d.) high-density lipoprotein cholesterol (HDL cholesterol) 1.33 (0.31), low-density lipoprotein cholesterol 3.11 (0.87), triglycerides 1.23 (0.64)mmoll−1 and 10-year PROCAM risk 1.8 (1.7)%. The participants spent mean (s.d.) 9.1 (1.8)h per day sedentary, 7.6 (1.2)h per day sleeping, 3.9 (1.1)h per day standing and 3.3 (0.9)h per day stepping, accumulating 14708 (4984) steps per day in 61 (25) sit-to-stand transitions per day. In univariate regressions—adjusting for age, sex, family history of CHD, shift worked, job type and socioeconomic status—waist circumference (P=0.005), fasting triglycerides (P=0.002), HDL cholesterol (P=0.001) and PROCAM risk (P=0.047) were detrimentally associated with sedentary time. These associations remained significant after further adjustment for sleep, standing and stepping in stepwise regression models. However, after further adjustment for waist circumference, the associations were not significant. Compared with those without the metabolic syndrome, participants with the metabolic syndrome were significantly less active—fewer steps, shorter stepping duration and longer time sitting. Those with no metabolic syndrome features walked >15000 steps per day or spent >7h per day upright.

Conclusions:

 

Longer time spent in sedentary posture is significantly associated with higher CHD risk and larger waist circumference.

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