Directly measured and predicted <math xmlns='http://www.w3.org/1998/Math/MathML'> <mrow> <mover accent='true'> <mi>V</mi> <mo>˙</mo> </mover> <msub> <mi>O</mi> <mrow> <mn>2</mn><mi>max</mi></mrow> </msub> </mrow> </math> values (from 20m shuttle run test performance), bias and confidence intervals for the three models.

Table 1: Directly measured and predicted $\dot{V} O_{2 \max}$ values (from 20m shuttle run test performance), bias and confidence intervals for the three models.

VO_2maxdata		95% Confidence Interval		Pearson Correlation
Mean ± SD (ml kg^-1 min^-1)	Bias (ml kg^-1 min^-1)	Lower Bound	Upper Bound	Pearson r value
Direct measure 51.2 ± 8.6
RR (1988) 44.4 ± 9.1	6.8	6.02	7.49	0.844
LL (1988) 46.8 ± 7.9	4.4	3.66	5.07	0.839
AN (2020) 49.8 ± 9.3	1.4	0.66	2.16	0.842

Key: RR = Ramsbottom, et al. [15]; LL = Leger, et al. [14]; AN = Nevill, et al. [1].