Segregating the distinct effects of sedentary behaviour and physical activity on older adults’ cardiovascular profile: Part 2- Isotemporal substitution approach.

Declan John Ryan, Jorgen Wullems, Georgina Stebbings, Christopher Morse, Claire Stewart, Gladys Onambele-Pearson

    Research output: Contribution to journalArticle

    Abstract

    BACKGROUND: 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.
    Original languageEnglish
    Article number7
    Pages (from-to)537-542
    Number of pages6
    JournalJournal of Physical Activity and Health
    Volume15
    Issue number7
    DOIs
    Publication statusPublished - 1 Jul 2018

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    Popliteal Artery
    Carotid Arteries
    Brachial Artery
    Thigh
    Life Style
    Heart Rate
    Phenotype
    Light

    Cite this

    Ryan, Declan John ; Wullems, Jorgen ; Stebbings, Georgina ; Morse, Christopher ; Stewart, Claire ; Onambele-Pearson, Gladys. / Segregating the distinct effects of sedentary behaviour and physical activity on older adults’ cardiovascular profile: Part 2- Isotemporal substitution approach. In: Journal of Physical Activity and Health. 2018 ; Vol. 15, No. 7. pp. 537-542.
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    Segregating the distinct effects of sedentary behaviour and physical activity on older adults’ cardiovascular profile: Part 2- Isotemporal substitution approach. / Ryan, Declan John; Wullems, Jorgen; Stebbings, Georgina; Morse, Christopher; Stewart, Claire; Onambele-Pearson, Gladys.

    In: Journal of Physical Activity and Health, Vol. 15, No. 7, 7, 01.07.2018, p. 537-542.

    Research output: Contribution to journalArticle

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    AU - Ryan, Declan John

    AU - Wullems, Jorgen

    AU - Stebbings, Georgina

    AU - Morse, Christopher

    AU - Stewart, Claire

    AU - Onambele-Pearson, Gladys

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    N2 - BACKGROUND: 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.

    AB - BACKGROUND: 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.

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