. Author manuscript; available in PMC: 2013 Jul 31.

Published in final edited form as: Med Sci Sports Exerc. 2012 Apr;44(4):709–715. doi: 10.1249/MSS.0b013e3182366f6c

Table 2.

Maximal exercise metabolic data according to PRAL (mEq/day) tertiles.

	All Subjects (n=57)	Lower PRAL Tertile (n=19)	Middle PRAL Tertile (n=19)	Upper PRAL Tertile (n=19)	P-value

PRAL, mEq/day	−8.2 (−29.8, 51.9)	−10.8 (−29.8, −1.1)	8.2 (1.0, 15.1)	27.1 (15.4, 51.9)	------
VO₂max, L/min	2.05 ± 0.07	1.95 ± 0.11	2.07 ± 0.13	2.13 ± 0.14	0.60
VO₂max, ml/kg/min	25.5 ± 0.6	23.4 ± 0.9	26.1 ± 1.1	25.1 ± 1.3	0.82
V_E/VCO₂max ratio	26.1 ± 0.4	25.4 ± 0.8	26.3 ± 0.6	26.5 ± 0.7	0.52
HR_max, beats/min	169 ± 2	164 ± 3^*	171 ± 2	173 ± 3	0.04
HR_max, % of predicted HR_max	100 ± 1	97 ± 2^*	102 ± 1	102 ± 1	0.03

PRAL scores are given as means with ranges (min, max). Metabolic outcomes are means ± SE. P-value is from the ANOVA comparing outcomes across PRAL tertiles.

P ≤ 0.05 vs. the highest PRAL tertile. V_E/VCO₂max ratio, ventilatory equivalent for carbon dioxide production during maximal exercise. Heart rate maximum is presented as a percentage of age predicted HR_max (208-(0.7× age in yr).