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Table 4 Estimation of oxygen consumption (O2, mL·kg−1·min−1) during Nordic walking (NW) and conventional walking (W) using simple linear regression analysis

From: Estimation of energy expenditure of Nordic walking: a crossover trial

  Walking stage (treadmill grade = 0.00) Linear regression analysis
Stage 1 Stage 2 Stage 3 Constant Coefficients for speed R R2
Treadmill speed 50.0 m·min−1 (3 km·h− 1) 66.7 m·min− 1 (4 km·h− 1) 83.3 m·min− 1 (5 km·h− 1)     
O2 NW 10.9 ± 0.57 12.1 ± 0.54 14.0 ± 0.64 6.16 0.09 0.497 0.247
O2 W 9.0 ± 0.38 10.1 ± 0.38 12.0 ± 0.38 4.36 0.09 0.648 0.420
  Walking stage (treadmill speed = 83.3 m·min− 1) Linear regression analysis
  Stage 3 Stage 4 Stage 5 Stage 6 Stage 7 Constant Coefficients for grade R R2
Treadmill grade 0.00 0.01 0.03 0.05 0.07     
O2 NW 14.0 ± 0.64 15.3 ± 0.54 16.5 ± 0.51 18.6 ± 0.52 21.2 ± 0.44 13.9 99.2 0.757 0.573
O2 W 12.0 ± 0.38 13.0 ± 0.43 14.8 ± 0.47 16.7 ± 0.39 19.0 ± 0.37 11.9 100.1 0.821 0.675
  1. Values are mean ± standard error