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Cadence (steps/min) and relative intensity in 61 to 85-year-olds: the CADENCE-Adults study.
McAvoy, Cayla R; Miller, Taavy A; Aguiar, Elroy J; Ducharme, Scott W; Moore, Christopher C; Schuna, John M; Barreira, Tiago V; Chase, Colleen J; Gould, Zachary R; Amalbert-Birriel, Marcos A; Chipkin, Stuart R; Staudenmayer, John; Tudor-Locke, Catrine; Bucko, Agnes; Mora-Gonzalez, Jose.
Afiliação
  • McAvoy CR; College of Health and Human Services, University of North Carolina at Charlotte, 9201 University City Blvd, Charlotte, NC, 28223, USA.
  • Miller TA; College of Health and Human Services, University of North Carolina at Charlotte, 9201 University City Blvd, Charlotte, NC, 28223, USA.
  • Aguiar EJ; Department of Kinesiology, The University of Alabama, Tuscaloosa, AL, USA.
  • Ducharme SW; Department of Kinesiology, California State University, Long Beach, Long Beach, CA, USA.
  • Moore CC; Department of Epidemiology, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
  • Schuna JM; School of Biological and Population Health Sciences, Oregon State University, Corvallis, OR, USA.
  • Barreira TV; Exercise Science Department, Syracuse University, Syracuse, NY, USA.
  • Chase CJ; Department of Kinesiology, University of Massachusetts Amherst, Amherst, MA, USA.
  • Gould ZR; Department of Kinesiology, University of Massachusetts Amherst, Amherst, MA, USA.
  • Amalbert-Birriel MA; Department of Kinesiology, University of Massachusetts Amherst, Amherst, MA, USA.
  • Chipkin SR; Department of Kinesiology, University of Massachusetts Amherst, Amherst, MA, USA.
  • Staudenmayer J; Department of Mathematics and Statistics, University of Massachusetts Amherst, Amherst, MA, USA.
  • Tudor-Locke C; College of Health and Human Services, University of North Carolina at Charlotte, 9201 University City Blvd, Charlotte, NC, 28223, USA. Tudor-Locke@charlotte.edu.
  • Bucko A; College of Health and Human Services, University of North Carolina at Charlotte, 9201 University City Blvd, Charlotte, NC, 28223, USA.
  • Mora-Gonzalez J; College of Health and Human Services, University of North Carolina at Charlotte, 9201 University City Blvd, Charlotte, NC, 28223, USA.
Int J Behav Nutr Phys Act ; 20(1): 141, 2023 Nov 29.
Article em En | MEDLINE | ID: mdl-38031156
BACKGROUND: We previously demonstrated that a heuristic (i.e., evidence-based, rounded yet practical) cadence threshold of ≥ 100 steps/min was associated with absolutely-defined moderate intensity physical activity (i.e., ≥ 3 metabolic equivalents [METs]) in older adults 61-85 years of age. Although it was difficult to ascertain achievement of absolutely-defined vigorous (6 METs) intensity, ≥ 130 steps/min was identified as a defensible threshold for this population. However, little evidence exists regarding cadence thresholds and relatively-defined moderate intensity indicators, including ≥ 64% heart rate [HR] maximum [HRmax = 220-age], ≥ 40% HR reserve [HRR = HRmax-HRresting], and ≥ 12 Borg Scale Rating of Perceived Exertion [RPE]; or vigorous intensity indicators including ≥ 77%HRmax, ≥ 60%HRR, and ≥ 14 RPE. PURPOSE: To analyze the relationship between cadence and relatively-defined physical activity intensity and identify relatively-defined moderate and vigorous heuristic cadence thresholds for older adults 61-85 years of age. METHODS: Ninety-seven ostensibly healthy adults (72.7 ± 6.9 years; 49.5% women) completed up to nine 5-min treadmill walking bouts beginning at 0.5 mph (0.8 km/h) and progressing by 0.5 mph speed increments (with 2-min rest between bouts). Directly-observed (and video-recorded) steps were hand-counted, HR was measured using a chest-strapped monitor, and in the final minute of each bout, participants self-reported RPE. Segmented mixed model regression and Receiver Operating Characteristic (ROC) curve analyses identified optimal cadence thresholds associated with relatively-defined moderate (≥ 64%HRmax, ≥ 40%HRR, and ≥ 12 RPE) and vigorous (≥ 77%HRmax, ≥ 60%HRR, and ≥ 14 RPE) intensities. A compromise between the two analytical methods, including Youden's Index (a sum of sensitivity and specificity), positive and negative predictive values, and overall accuracy, yielded final heuristic cadences. RESULTS: Across all relatively-defined moderate intensity indicators, segmented regression models and ROC curve analyses identified optimal cadence thresholds ranging from 105.9 to 112.8 steps/min and 102.0-104.3 steps/min, respectively. Comparable values for vigorous intensity indicators ranged between126.1-132.1 steps/min and 106.7-116.0 steps/min, respectively. Regardless of the relatively-defined intensity indicator, the overall best heuristic cadence threshold aligned with moderate intensity was ≥ 105 steps/min. Vigorous intensity varied between ≥ 115 (greater sensitivity) or ≥ 120 (greater specificity) steps/min. CONCLUSIONS: Heuristic cadence thresholds align with relatively-defined intensity indicators and can be useful for studying and prescribing older adults' physiological response to, and/or perceived experience of, ambulatory physical activity. TRIAL REGISTRATION: Clinicaltrials.gov NCT02650258. Registered 24 December 2015.
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Texto completo: 1 Base de dados: MEDLINE Assunto principal: Exercício Físico / Caminhada Limite: Aged / Female / Humans / Male Idioma: En Ano de publicação: 2023 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Assunto principal: Exercício Físico / Caminhada Limite: Aged / Female / Humans / Male Idioma: En Ano de publicação: 2023 Tipo de documento: Article