title: Objectively-Measured Free-Living Physical Activity and Heart Rate Recovery.
abstract: The purpose of this study was to examine the association of free-living, objectively-measured physical activity on treadmill-based heart rate recovery (HRR), a parameter known to associate with morbidity and mortality. Data was used from 2003 to 2004 NHANES. Physical activity was assessed via accelerometry, with HRR recovery assessed from a treadmill-based test. Heart rate recovery minute 1 (HRR1) and minute 2 (HRR2) were calculated. After adjustment, light and vigorous-intensity free-living physical activity, respectively, were associated with HRR1(βadjusted= 0.69, 95% CI 0.22-1.14; βadjusted1.94, 95% CI 0.01-3.9) and HRR2(βadjusted= 0.99, 95% CI 0.35-1.62; βadjusted= 5.88, 95% CI 2.63-9.12). Moderate physical activity was not associated with HRR1(βadjusted= 0.60, 95% CI -0.41 to 1.62), but was with HRR2(βadjusted= 2.28, 95% CI 1.27-3.28). As free-living physical activity intensity increased, there was a greater association with HRR. This finding may provide mechanistic insight of previous research observations demonstrating intensity-specific effects of physical activity on various health outcomes.
authors.affiliation: Department of Health, Exercise Science and Recreation Management, The University of Mississippi, P. O. Box 1848, University, MS, 38677, USA.
authors.forename: Brittany R
authors.initials: BR
authors.lastname: Counts
authors.affiliation: Department of Health, Exercise Science and Recreation Management, The University of Mississippi, P. O. Box 1848, University, MS, 38677, USA.
authors.forename: Jeremy P
authors.initials: JP
authors.lastname: Loenneke
authors.affiliation: Department of Health, Exercise Science and Recreation Management, The University of Mississippi, P. O. Box 1848, University, MS, 38677, USA. pdloprin@olemiss.edu.
authors.forename: Paul D
authors.initials: PD
authors.lastname: Loprinzi
mesh_terms: D061725:Accelerometry; D000328:Adult; D001341:Autonomic Nervous System / Q000502:physiology*; D017704:Baroreflex / Q000502:physiology; D015444:Exercise / Q000502:physiology*; D005260:Female; D006339:Heart Rate / Q000502:physiology*; D006801:Humans; D008297:Male
keywords: Accelerometry; Autonomic nervous system; Baroreflex sensitivity; Vagal tone