Table 5. Comparison of the two methods of Weyand et al.

Method	R2	MAE	MAPE	RMSE	RMSRE
1	0.441	3.65	7.96%	4.86	10.89%
2	0.467	3.58	7.81%	4.74	10.63%

R² = explained variance, MA(P)E = mean absolute (percentage) error and RMS(R)E = root mean squared (relative) error. MAE and RMSE are expressed in ml ⋅ kg⁻¹ ⋅ min⁻¹.