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Int J Epidemiol. 2013 Apr;42(2):533-40. doi: 10.1093/ije/dyt015. Epub 2013 Feb 18.

Effect of physical activity measurement type on the association between walking activity and glucose regulation in a high-risk population recruited from primary care.

Author information

1
National Institute for Health Research Leicester-Loughborough Diet, Lifestyle and Physical Activity Biomedical Research Unit, University Hospitals of Leicester and University of Leicester, Leicester, UK. Ty20@le.ac.uk

Abstract

BACKGROUND:

We investigate associations of self-reported and objectively assessed walking activity with measures of glucose regulation in a multi-ethnic population at high risk of type 2 diabetes.

METHODS:

This study reports data from a 2009-2011 screening programme for impaired glucose regulation (IGR) within a high-risk primary care population in Leicestershire, UK; 2532 participants (38% women, 8% South Asian) with a mean age of 64 ± 8 years and an average BMI of 32.1 ± 5.6 kg/m(2) were included. Walking activity was measured by self-report (International Physical Activity Questionnaire) and objectively (pedometer). Glucose regulation assessments included 2h post-challenge glucose, fasting glucose and HbA1c.

RESULTS:

Higher levels of self-reported walking activity and pedometer steps were associated with lower 2h post-challenge glucose after controlling for several known confounding variables, including BMI. Similarly, when categorized in tertiles, both measures were associated with a lower odds of having any form of IGR; odds ratio for lowest vs highest tertile was 0.64 (0.51-0.80) for self-report and 0.69 (0.55-0.87) for pedometer steps. There was no significant difference between self-reported and objective measures in the strength of associations with glucose regulation; associations with self-report were maintained when further adjusted for pedometer steps. Stronger associations between self-reported walking activity and glucose regulation were observed in South Asians compared with White Europeans.

CONCLUSIONS:

Self-reported and objectively measured walking activity were equally associated with indices of glucose regulation. Associations with self-reported walking activity were maintained when further adjusted for pedometer steps, suggesting that self-reported walking activity may measure facets of physical activity that are beyond total volume.

PMID:
23421988
DOI:
10.1093/ije/dyt015
[Indexed for MEDLINE]

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