Fig. 2From: Estimation of energy expenditure of Nordic walking: a crossover trialVentilatory gas analysis results during walking (W) and Nordic walking (NW). a. Oxygen uptake (V̇O2). b. Ventilation (V̇E). c. Heart rate. d. Systolic blood pressure (SBP). e. Rate of perceived exertion (RPE). * P < .05Back to article page