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- Title
Walking cadence (steps/min) and intensity in 21–40 year olds: CADENCE-adults.
- Authors
Tudor-Locke, Catrine; Aguiar, Elroy J.; Han, Ho; Ducharme, Scott W.; Schuna, John M.; Barreira, Tiago V.; Moore, Christopher C.; Busa, Michael A.; Lim, Jongil; Sirard, John R.; Chipkin, Stuart R.; Staudenmayer, John
- Abstract
Background: Previous studies have reported that walking cadence (steps/min) is associated with absolutely-defined intensity (metabolic equivalents; METs), such that cadence-based thresholds could serve as reasonable proxy values for ambulatory intensities. Purpose: To establish definitive heuristic (i.e., evidence-based, practical, rounded) thresholds linking cadence with absolutely-defined moderate (3 METs) and vigorous (6 METs) intensity. Methods: In this laboratory-based cross-sectional study, 76 healthy adults (10 men and 10 women representing each 5-year age-group category between 21 and 40 years, BMI = 24.8 ± 3.4 kg/m2) performed a series of 5-min treadmill bouts separated by 2-min rests. Bouts began at 0.5 mph and increased in 0.5 mph increments until participants: 1) chose to run, 2) achieved 75% of their predicted maximum heart rate, or 3) reported a Borg rating of perceived exertion > 13. Cadence was hand-tallied, and intensity (METs) was measured using a portable indirect calorimeter. Optimal cadence thresholds for moderate and vigorous ambulatory intensities were identified using a segmented regression model with random coefficients, as well as Receiver Operating Characteristic (ROC) models. Positive predictive values (PPV) of candidate heuristic thresholds were assessed to determine final heuristic values. Results: Optimal cadence thresholds for 3 METs and 6 METs were 102 and 129 steps/min, respectively, using the regression model, and 96 and 120 steps/min, respectively, using ROC models. Heuristic values were set at 100 steps/min (PPV of 91.4%), and 130 steps/min (PPV of 70.7%), respectively. Conclusions: Cadence thresholds of 100 and 130 steps/min can serve as reasonable heuristic thresholds representative of absolutely-defined moderate and vigorous ambulatory intensity, respectively, in 21–40 year olds. These values represent useful proxy values for recommending and modulating the intensity of ambulatory behavior and/or as measurement thresholds for processing accelerometer data. Trial registration: Clinicaltrials.gov (NCT02650258).
- Subjects
CALORIMETRY; DIAGNOSIS; EXERCISE; GAIT in humans; HEART beat; REGRESSION analysis; TREADMILLS; BODY mass index; PREDICTIVE tests; CROSS-sectional method; RECEIVER operating characteristic curves; EXERCISE intensity; WALKING speed
- Publication
International Journal of Behavioral Nutrition & Physical Activity, 2019, Vol 16, Issue 1, pN.PAG
- ISSN
1479-5868
- Publication type
Article
- DOI
10.1186/s12966-019-0769-6