The AT point was primarily determined using the V-slope
method [5] in addition to the following conventional criteria [6,7]:
(1) ˙VE/˙VO2 increases after registering as flat or decreasing, whereas
˙V
E/˙VCO2 remains constant or decreases, and (2) R versus exercise
time, which was flat or slowly increasing, begins to increase
more sharply. Or, (3) FETO2 increases after registering as flat or
decreasing, whereas FETCO2 remains constant or decreases. AT was
expressed in ˙VO2 , and usually divided by body weight (ml/min/kg).