Differences in levels of physical activity between White and South Asian populations within a healthcare setting: impact of measurement type in a cross-sectional study

Thomas Yates, Joe Henson, Charlotte Edwardson, Danielle H Bodicoat, Melanie J Davies, Kamlesh Khunti, Thomas Yates, Joe Henson, Charlotte Edwardson, Danielle H Bodicoat, Melanie J Davies, Kamlesh Khunti

Abstract

Objective: We investigate differences between White and South Asian (SA) populations in levels of objectively measured and self-reported physical activity.

Design: Cross-sectional study.

Setting: Leicestershire, UK, 2010-2011.

Participants: Baseline data were pooled from two diabetes prevention trials that recruited a total of 4282 participants from primary care with a high risk score for type 2 diabetes. For this study, 2843 White (age=64±8, female=37%) and 243 SA (age=58±9, female=34%) participants had complete physical activity data and were included in the analysis.

Outcome measures: Moderate-intensity to vigorous-intensity physical activity (MVPA) and walking activity were measured using the International Physical Activity Questionnaire (IPAQ), and a combination of piezoelectric pedometer (NL-800) and accelerometer (Actigraph GT3X) were used to objectively measure physical activity.

Results: Compared to White participants, SA participants self-reported less MVPA (30 vs 51 min/day; p<0.001) and walking activity (11 vs 17 min/day; P=0.001). However, there was no difference in objectively measured ambulatory activity (5992 steps/day vs 6157 steps/day; p=0.75) or in time spent in MVPA (18.0 vs 21.5 min/day; p=0.23). Results were largely unaffected when adjusted for age, sex and social deprivation. Compared to accelerometer data, White participants overestimated their time in MVPA by 51 min/day and SA participants by 21 min/day.

Conclusions: SA and White groups undertook similar levels of physical activity when measured objectively despite self-reported estimates being around 40% lower in the SA group. This emphasises the limitations of comparing self-reported lifestyle measures across different populations and ethnic groups.

Trial registration number: Reports baseline data from: Walking Away from Type 2 Diabetes (ISRCTN31392913) and Let's Prevent Diabetes (NCT00677937).

Keywords: EPIDEMIOLOGY; SPORTS MEDICINE.

Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions.

Figures

Figure 1
Figure 1
Bland Altman plots showing the mean bias and limits of agreement when comparing self-reported MVPA with accelerometer derived total MVPA (graph A for White participants and C for South Asian participants) and MVPA accumulated in at least 10 min bouts (graph B for White participants and graph D for South Asian participants). MVPA, moderate-intensity to vigorous-intensity physical activity.

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Source: PubMed

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