IJCS | Volume 32, Nº4, July/August 2019

381 Belli et al. Speed and grade increment during cardiopulmonary Int J Cardiovasc Sci. 2019;32(4):374-383 Original Article Figure 4 - Ventilatory and metabolic results from the prescribed submaximal exercise tests according to the speed and grade protocols. Darkened circles: exercise prescription based on the speed protocol; open circles: exercise prescription based on the grade protocol. All p values were obtained from generalized estimating equations. VE/VO 2 : ventilatory equivalent for oxygen. * p < 0.05 between protocols.