Fig. 1
From: A Comparison of Methodological Approaches to Measuring Cycling Mechanical Efficiency
Spearman’s rank correlations ρ for the inspected six indices of mechanical efficiency. With two transversal lines, values corresponding to significance levels p < 0.05 and p < 0.01 have been drawn. The indices can be divided into three groups: groups I, II, and III. GE gross efficiency, NE net efficiency, T economy, DE delta efficiency, WEe work efficiency with extrapolated zero load energy expenditure, WEm work efficiency with measured zero load energy expenditure