| Autor: |
Paterson C; Department of Exercise and Sports Science, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States., Stone K; Cardiff School of Sport and Health Sciences, Cardiff Metropolitan University, Cardiff, United Kingdom., Turner L; School of Natural, Social and Sport Sciences, University of Gloucestershire, Gloucester, United Kingdom., Moinuddin A; School of Natural, Social and Sport Sciences, University of Gloucestershire, Gloucester, United Kingdom., Stoner L; Department of Exercise and Sports Science, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States.; Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States.; Center for Health Promotion and Disease Prevention, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, United States., Fryer S; School of Natural, Social and Sport Sciences, University of Gloucestershire, Gloucester, United Kingdom. |
| Abstrakt: |
Prolonged uninterrupted sitting of >3 h has been shown to acutely cause central and peripheral cardiovascular dysfunction. However, individuals rarely sit uninterrupted for >2 h, and the cardiovascular response to this time is currently unknown. In addition, while increased cardiorespiratory fitness (CRF) and habitual physical activity (HPA) are independently associated with improvements in central and peripheral cardiovascular function, it remains unclear whether they influence the response to uninterrupted sitting. This study sought to 1 ) determine whether 2 h of uninterrupted sitting acutely impairs carotid-femoral pulse wave velocity (cfPWV), femoral ankle PWV (faPWV), and central and peripheral blood pressure and 2 ) investigate the associations between CRF and HPA versus PWV changes during uninterrupted sitting. Following 2 h of uninterrupted sitting, faPWV significantly increased [mean difference (MD) = 0.26 m·s -1 , standard error (SE) = 0.10, P = 0.013] as did diastolic blood pressure (MD = 2.83 mmHg, SE = 1.08, P = 0.014), however, cfPWV did not significantly change. Although our study shows 2 h of uninterrupted sitting significantly impairs faPWV, neither CRF ( r = 0.105, P = 0.595) nor HPA ( r = -0.228, P = 0.253) was associated with the increases. NEW & NOTEWORTHY We demonstrate that neither cardiorespiratory fitness nor habitual physical activity influence central and peripheral cardiovascular responses to a 2-h bout of uninterrupted sitting in healthy young adults. |
