Journal Article

A Comparison of Accelerometer Cut-Points among Individuals with Coronary Artery Disease

Prince, Stephanie A., Grace, Sherry L., Reid, Robert D., Reed, Jennifer L., Mark, Amy E., Blanchard, Christopher M.

2015

Overview

Accurate assessment of physical activity among coronary artery disease patients is important for assessing adherence to interventions. The study compared moderate-to-vigorous physical intensity activity and relationships with cardiometabolic health/fitness indicators using accelerometer cut-points developed for coronary artery disease patients versus those developed in younger and middle-aged adults. A total of 231 adults with coronary artery disease wore an Actigraph GT3X accelerometer for ≥4 days (≥10 hours/day). Moderate-to-vigorous intensity physical activity between cut-points was compared using Bland-Altman analyses. Partial spearman correlations assessed relationships between moderate-to-vigorous intensity physical activity from each cut-point with markers of cardiometabolic health and fitness while controlling for age and sex. Average time spent in bouts of moderate-to-vigorous intensity physical activity using coronary artery disease cut-points was significantly higher than the young (mean difference: 13.0±12.8 minutes/day) or middle-aged (17.0±15.2 minutes/day) cut-points. Young and middle-aged cut-points were more strongly correlated with body mass index, waist circumference and systolic blood pressure, while coronary artery disease cut-points had stronger relationships with triglycerides, high-density and low-density lipoproteins. All were similarly correlated with measures of fitness. Researchers need to exert caution when deciding on which cut-points to apply to their population. Further work is needed to validate which cut-points provide a true reflection of moderate-to-vigorous intensity physical activity and to examine relationships among patients with varying fitness.

• Publisher: Public Library of Science,Public Library of Science (PLoS)
• Subject: Accelerometers / Actigraphy - instrumentation / Actigraphy - methods / Adult / Adults / Aged / Aged, 80 and over / Biomarkers / Blood pressure / Body mass / Body mass index / Body size / Canada - epidemiology / Cardiac output / Cardiovascular disease / Coronary artery / Coronary artery disease / Coronary Artery Disease - epidemiology / Coronary Artery Disease - metabolism / Coronary Artery Disease - physiopathology / Coronary heart disease / Coronary vessels / Correlation analysis / Disease prevention / Exercise / Female / Fitness / Fitness training programs / Gender differences / Heart / Heart diseases / Humans / Lipids / Lipoproteins / Male / Measurement / Medical diagnosis / Middle age / Middle Aged / Motor Activity / Patients / Physical activity / Physical fitness / Physiological aspects / Reference Values / Rehabilitation / Researchers / Socioeconomic Factors / Studies / Triglycerides