Table 5. VO_2max prediction equations for cyclists.

Model’s category	Multiple linear regression equation	R2	Derivation group performance		Validation group performance
			RMSE	MAE	RMSE	MAE
AT	VO2max = 21.29 + 0.95 * rVO2AT + 1.74 * rPOWAT - 0.30 * BF	0.811	3.62	2.89	3.42	2.72
RCP	VO2max = 8.57 + 1.08 * rVO2RCP - 0.04 * VERCP	0.913	2.12	1.66	2.03	1.64
AT+RCP	VO2max = 10.57 + 0.98 * rVO2RCP - 0.12 * BF	0.909	2.26	1.78	2.11	1.72
SOM	VO2max = 82.36–0.14 * BM - 0.66 * BF - 0.22 * Age	0.43	6.06	4.70	6.11	4.74

AT, equation based on anaerobic threshold; RCP, equation based on respiratory compensation point; SOM, equation based on somatic variables only; R², adjusted R²; RMSE, root mean square error; MAE, mean absolute error (mL·min^–1·kg^–1); VO_2max, maximal oxygen uptake relative to body mass (mL·min^–1·kg^–1); rVO_2AT, oxygen uptake at anaerobic threshold relative to body mass (mL·min^–1·kg^–1); rPOW_AT, power at anaerobic threshold relative to body mass (W·kg^–1); rVO_2RCP, oxygen uptake at respiratory compensation point relative to body mass (mL·min^–1·kg^–1); VE_RCP, pulmonary ventilation at respiratory compensation point (L·min^–1); BF, body fat (%); BM, body mass (kg).