![]() At least six studies have proposed a cadence of 100 steps/min as a reasonable heuristic threshold (evidence-based, practical, rounded value) associated with absolutely-defined moderate intensity (3 metabolic equivalents, METs 1 MET = 3.5 mL/kg/min of O 2 consumption), which is the minimal level of intensity recommended in public health physical activity guidelines. Cadence is the principal strategy for increasing over-ground ambulatory speed, at least up to a self-selected preferred speed. Ĭadence and stride length combine to determine speed of ambulation. More recently, it has become recognized that the time-stamped sampling nature of accelerometry-based physical activity monitors also uniquely lends itself to the minute-by-minute study of ambulatory behavior in terms of cadence (steps/min) enacted in free-living contexts. Step counting has been embraced by researchers, clinicians, and consumers as an intuitively simple approach to communicating physical activity volume, expressed typically as steps/day. It is evident, however, that despite the diversity of design, most technologies capable of monitoring the wearer’s physical activity offer step counting as one of the detectable metrics. Objective monitoring of physical activity has quickly advanced since the millennium with the increasing and widespread availability of a variety of research- and consumer-grade wearable technologies. These values represent useful proxy values for recommending and modulating the intensity of ambulatory behavior and/or as measurement thresholds for processing accelerometer data. ConclusionsĬadence 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. Heuristic values were set at 100 steps/min (PPV of 91.4%), and 130 steps/min (PPV of 70.7%), respectively. 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. Positive predictive values (PPV) of candidate heuristic thresholds were assessed to determine final heuristic values. 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. Cadence was hand-tallied, and intensity (METs) was measured using a portable indirect calorimeter. ![]() 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. 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/m 2) performed a series of 5-min treadmill bouts separated by 2-min rests. To establish definitive heuristic (i.e., evidence-based, practical, rounded) thresholds linking cadence with absolutely-defined moderate (3 METs) and vigorous (6 METs) intensity. ![]() Thus, YOGA may be a viable form of physical activity to achieve public health guidelines and to elicit health benefits.Ĭaloric expenditure exercise heart rate indirect calorimetry perceived exertion physical activity.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. YOGA meets the criteria for moderate-intensity physical activity. 001) but not compared with SELF (difference = 15.1 ± 48.7 kcal P =. Analyses using only the initial 45 minutes from each of the sessions, which excluded the restorative component of YOGA, showed energy expenditure was significantly lower in YOGA compared with HR-Match (difference = 68.0 ± 40.1 kcal P <. A similar pattern was observed for metabolic equivalents (HR-Match = 4.7 ± 0.8, SELF = 4.4 ± 0.7, YOGA = 3.6 ± 0.6 P <. 001), but not in SELF compared with HR-Match (difference = 27.8 ± 72.6 kcal P =. Energy expenditure was assessed via indirect calorimetry.Įnergy expenditure was significantly lower in YOGA compared with HR-Match (difference = 79.5 ± 44.3 kcal P <. Participants (20 males, 18 females) performed 60-minute sessions of vinyasa yoga (YOGA), treadmill walking at a self-selected brisk pace (SELF), and treadmill walking at a pace that matched the heart rate of the YOGA session (HR-Match). To compare energy expenditure during acute bouts of vinyasa yoga and 2 walking protocols. Whether the energy cost of vinyasa yoga meets the criteria for moderate-to-vigorous physical activity has not been established.
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