Division of Experimental Medicine, Department of Medicine, Faculty of Medicine, McGill University, Canada.
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The impact of accelerometer wear location on the relationship between step counts and arterial stiffness in adults treated for hypertension and diabetes
- Published on Aug 24, 2017
Objectives: Accelerometer placement at the wrist is convenient and increasingly adopted despite less accurate physical activity (PA) measurement than with waist placement. Capitalizing on a study that started with wrist placement and shifted to waist placement, we compared associations between PA measures derived from different accelerometer locations with a responsive arterial health indicator, carotid-femoral pulse wave velocity (cfPWV).
Design: Cross-sectional study.
Methods: We previously demonstrated an inverse association between waist-worn pedometer-assessed step counts (Yamax SW-200, 7 days) and cfPWV (-0.20m/s, 95% CI -0.28, -0.12 per 1000 step/day increment) in 366 adults. Participants concurrently wore accelerometers (ActiGraph GT3X+), most at the waist but the first 46 at the wrist. We matched this subgroup with participants from the ‘waist accelerometer’ group (sex, age, and pedometer-assessed steps/day) and assessed associations with cfPWV (applanation tonometry, Sphygmocor) separately in each subgroup through linear regression models.
Results: Compared to the waist group, wrist group participants had higher step counts (mean difference 3980 steps/day; 95% CI 2517, 5443), energy expenditure (967kcal/day, 95% CI 755, 1179), and moderate-to-vigorous-PA (138min; 95% CI 114, 162). Accelerometer-assessed step counts (waist) suggested an association with cfPWV (-0.28m/s, 95% CI -0.58, 0.01); but no relationship was apparent with wrist-assessed steps (0.02m/s, 95% CI -0.24, 0.27).
Conclusions: Waist but not wrist ActiGraph PA measures signal associations between PA and cfPWV. We urge researchers to consider the importance of wear location choice on relationships with health indicators.
Author(s)
- Cooke AB 1
- Daskalopoulou SS 2
- Dasgupta K 3
Institution(s)
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1
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2 Division of Experimental Medicine, Department of Medicine, Faculty of Medicine, McGill University, Canada; Division of Internal Medicine, Department of Medicine, Faculty of Medicine, Research Institute of the McGill University Health Centre, Canada.
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3 Division of Internal Medicine, Department of Medicine, Faculty of Medicine, Research Institute of the McGill University Health Centre, Canada; Division of Clinical Epidemiology, Department of Medicine, Faculty of Medicine, McGill University, Canada. Electronic address: kaberi.dasgupta@mcgill.ca.
Journal
Journal of Science and Medicine in Sport