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Segregating the Distinct Effects of Sedentary Behavior and Physical Activity on Older Adults' Cardiovascular Profile: Part 2-Isotemporal Substitution Approach.

Ryan, DJ, Wullens, JA, Stebbings, GK, Morse, CI, Stewart, CE and Onambele-Pearson, GL (2018) Segregating the Distinct Effects of Sedentary Behavior and Physical Activity on Older Adults' Cardiovascular Profile: Part 2-Isotemporal Substitution Approach. Journal of Physical Activity and Health, 15 (7). pp. 537-542. ISSN 1543-5474

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Abstract

The aim of the study was to provide an isotemporal substitution model to predict how changes in physical behavior may affect the cardiovascular parameters (CVPs) of older adults. Methods: Participants wore a thigh-mounted accelerometer for 7 days. Phenotype of the carotid, brachial, and popliteal artery was conducted using ultrasound. Isotemporal substitution was used to simulate the degree to which replacing 1 hour of physical behavior with another would affect CVP. Results: Substitution of sedentary behavior with Standing and sporadic moderate- to vigorous-intensity physical activity (MVPA accumulated in bouts <10 min) would reduce resting heart rate [−6.20 beats per minute (−12.1 to −0.22) and −3.72 beats per minute (−7.01 to −0.44), respectively]. Substitution of sedentary behavior with light-intensity physical activity would reduce carotid artery diameter [−0.54 mm (−1.00 to −0.07)]. Substitution of Standing with sporadic MVPA would increase popliteal artery diameter [1.31 mm (0.11 to 2.51)]. Conclusions: Our modeling suggests that an accumulation of MVPA bouts that are shorter than the recommended 10-minute minimum may still improve CVP, with lower intensity physical activity also influencing CVP. Our findings are a promising avenue for lifestyle interventions in older adults to reduce the aging effects on CVP for those who cannot engage or sustain sufficient MVPA.

Item Type: Article
Additional Information: Accepted author manuscript version reprinted, by permission, from Journal of Physical Activity and Health, 2018, 8(7): 537- 542pp, https://doi.org/10.1123/jpah.2017-0326 © Human Kinetics, Inc.
Uncontrolled Keywords: 1106 Human Movement and Sports Sciences, 1302 Curriculum and Pedagogy
Subjects: R Medicine > RC Internal medicine > RC1200 Sports Medicine
Divisions: Sport & Exercise Sciences
Publisher: Human Kinetics
Date Deposited: 12 Feb 2019 11:59
Last Modified: 17 Mar 2019 21:17
DOI or Identification number: 10.1123/jpah.2017-0326
URI: http://researchonline.ljmu.ac.uk/id/eprint/10154

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