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Table 1 Prediction equations for metabolic power [W/kg] as a function of speed [km/h] and added mass [kg] for all three body locations [20]

From: Harvesting biomechanical energy or carrying batteries? An evaluation method based on a comparison of metabolic power

Body location Equation R 2
Ankle e (0.67913 + 0.190769 speed + 0.075217 mass) 0.78
Knee e (0.596228 + 0.206819 speed + 0.059647 mass) 0.83
Back e (0.518479 + 0.220584 speed + 0.011237 mass) 0.85
  1. Note: For the ankle and knee, the mass refers to the added mass for each leg. Therefore, a mass of 0.5 kg means that the person is carrying 0.5 kg on each leg, a total of 1 kg.