Elizabeth C Lefferts1, Esmée A Bakker2, Salvatore Carbone3, Carl J Lavie4, Duck-Chul Lee5. 1. Department of Kinesiology, College of Human Sciences, Iowa State University, Ames, IA, United States. 2. Radboud Institute for Health Sciences, Department of Physiology, Radboud University Medical Center, Nijmegen, The Netherlands; Research Institute for Sports and Exercise Sciences, Liverpool John Moores University, Liverpool, United Kingdom. 3. Department of Kinesiology & Health Sciences, College of Humanities & Sciences, Virginia Commonwealth University, Richmond, VA, United States; Department of Cardiovascular Diseases, John Ochsner Heart and Vascular Institute, Ochsner Clinical School, University of Queensland School of Medicine, New Orleans, LA, United States. 4. Pauley Heart Center, Department of Internal Medicine, Virginia Commonwealth University, Richmond, VA, United States. 5. Department of Kinesiology, College of Human Sciences, Iowa State University, Ames, IA, United States. Electronic address: dclee@iastate.edu.
Abstract
PURPOSE: To examine the associations of total steps/day and faster aerobic steps/day (≥60 steps/min) with the development of frailty in older adults with hypertension (HTN) using a two-phased cross-sectional and prospective approach. METHODS: The sample consisted of 427 older adults with HTN from the Physical Activity and Aging Study (PAAS), aged ≥65 years, with valid step data from an accelerometer-based pedometer. Participants were classified into tertiles of total steps/day (low, mid, high) and three categories of aerobic steps/day (none, low, high). Frailty was defined using a modified Fried score with 5 subdomains including shrinking, weakness, slowness, low physical activity (PA), and exhaustion. RESULTS: We observed a negative dose-response relationship across categories of total steps/day and aerobic steps/day for the prevalence of frailty and the subdomains of slowness, low PA, and exhaustion (all p for trends <0.05). Greater aerobic steps/day, but not total steps/day, was associated with lower incidence of developing frailty in the 241 participants with a follow-up examination who had no frailty at baseline. CONCLUSION: Higher aerobic steps/day were more strongly associated with the lower prevalence and incidence of frailty compared to total steps/day, suggesting that faster aerobic walking may potentially provide greater benefits regarding frailty in older adults with HTN.
PURPOSE: To examine the associations of total steps/day and faster aerobic steps/day (≥60 steps/min) with the development of frailty in older adults with hypertension (HTN) using a two-phased cross-sectional and prospective approach. METHODS: The sample consisted of 427 older adults with HTN from the Physical Activity and Aging Study (PAAS), aged ≥65 years, with valid step data from an accelerometer-based pedometer. Participants were classified into tertiles of total steps/day (low, mid, high) and three categories of aerobic steps/day (none, low, high). Frailty was defined using a modified Fried score with 5 subdomains including shrinking, weakness, slowness, low physical activity (PA), and exhaustion. RESULTS: We observed a negative dose-response relationship across categories of total steps/day and aerobic steps/day for the prevalence of frailty and the subdomains of slowness, low PA, and exhaustion (all p for trends <0.05). Greater aerobic steps/day, but not total steps/day, was associated with lower incidence of developing frailty in the 241 participants with a follow-up examination who had no frailty at baseline. CONCLUSION: Higher aerobic steps/day were more strongly associated with the lower prevalence and incidence of frailty compared to total steps/day, suggesting that faster aerobic walking may potentially provide greater benefits regarding frailty in older adults with HTN.
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