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Am J Epidemiol. 2018 Oct 1;187(10):2145-2150. doi: 10.1093/aje/kwy117.

Ten-Year Changes in Accelerometer-Based Physical Activity and Sedentary Time During Midlife: The CARDIA Study.

Author information

1
Department of Epidemiology, Human Genetics, and Environmental Sciences and Michael & Susan Dell Center for Healthy Living, UTHealth School of Public Health, Austin Campus, Austin, Texas.
2
Dell Medical School, Department of Women's Health, The University of Texas at Austin, Austin, Texas.
3
Division of Research, Kaiser Permanente Northern California, Oakland, California.
4
School of Public Health, Division of Epidemiology & Community Health, University of Minnesota, Minneapolis, Minnesota.
5
Division of Health and Human Physiology, University of Iowa, Iowa City, Iowa.
6
Feinberg School of Medicine, Department of Preventive Medicine, Northwestern University, Chicago, Illinois.
7
Department of Epidemiology, University of Alabama at Birmingham, Birmingham, Alabama.
8
Department of Medicine, Division of Preventive Medicine, University of Alabama at Birmingham, Birmingham, Alabama.
9
Division of Cardiovascular Sciences, Program in Prevention and Population Sciences, National Heart, Lung, and Blood Institute, Bethesda, Maryland.

Abstract

We describe 10-year changes in accelerometer-determined physical activity (PA) and sedentary time in a midlife cohort of the Coronary Artery Risk Development in Young Adults Study, within and by race and sex groups. Participants (n = 962) wore the accelerometer with valid wear (≥4 of 7 days, ≥10 hours per day) at baseline (2005-2006; ages 38-50 years) and 10-year follow-up (2015-2016; ages 48-60 years). Data were calibrated to account for accelerometer model differences. Participants (mean age = 45.0 (standard deviation, 3.5) years at baseline) had reduced accelerometer counts overall (mean = -65.5 (standard error (SE), 10.2) counts per minute/day), and within race and sex groups (all P < 0.001). Sedentary time increased overall (mean = 37.9 (SE, 3.7) minutes/day) and within race and sex groups, whereas light-intensity PA (mean = -30.6 (SE, 2.7) minutes/day) and moderate- to vigorous-intensity PA (mean = -7.5 (SE, 0.8) minutes/day) declined overall and within race and sex groups (all P < 0.001). Significant differences in 10-year change estimates were noted by race and sex groups for accelerometer counts, sedentary time, and moderate- to vigorous-intensity PA bouts; black men had the greatest reductions in PA compared with other groups. PA declines during midlife were characterized by reductions in light-intensity PA with increases in sedentary time, which may have important health consequences. Targeted efforts are needed to preserve PA, regardless of intensity level, across midlife.

PMID:
29893772
PMCID:
PMC6166210
[Available on 2019-10-01]
DOI:
10.1093/aje/kwy117

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