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Device-based measures often rely on the positive relationship between walking cadence and metabolic equivalents of task (METs) to estimate physical activity. It is unknown whether this relationship remains during jogging/running. The study purpose was to investigate the relationships between METs, cadence, and step length during walking and jogging/running. A treadmill protocol with 5 walking (3.2–6.4 km•hr −1 ) and 5 jogging/running stages (8.0–11.3 km•hr −1 ) was completed in 43 adults (23 ± 5 years, 19♀). Predictors of METs during walking and jogging/running were determined by generalized mixed modeling. The strongest prediction models for walking (R 2  = 0.72,  P  &lt; .001) and jogging/running (R 2  = 0.75,  P  &lt; .001) included cadence 2 , cadence, step length, age, and leg length (all,  P  &lt; .001). Step length accounted for 49.1% and 78.3% of model variance during walking and jogging/running, respectively. METs are poorly estimated by cadence during jogging/running but step length reduces error. Strategies to measure step length in free-living settings could better predict physical activity intensity.

Step Length, But Not Stepping Cadence, Strongly Predicts Physical Activity Intensity During Jogging and Running