Table 2.

Cardiovascular response during exercise

Variables	POTS		Controls
	Pre-training	Post-training
Standing resting
(l min−1)	0.24 ± 0.01	0.24 ± 0.01	0.26 ± 0.02
(ml kg−1 min−1)	3.5 ± 0.1†	3.5 ± 0.1†	3.9 ± 0.1
a-v (ml dl−1)	7.2 ± 0.3††	7.0 ± 0.3††	5.6 ± 0.2
HR (beats min−1)	116 ± 4††	107 ± 4*††	91 ± 4
(l min−1)	3.38 ± 0.14††	3.51 ± 0.17††	4.70 ± 0.33
SV (ml)	29 ± 1††	33 ± 2*††	52 ± 5
Peak exercise
(l min−1)	1.78 ± 0.08††	1.93 ± 0.08*††	2.40 ± 0.22
(ml kg−1 min−1)	26.1 ± 1.0††	28.9 ± 1.1**††	36.3 ± 0.9
Peak a-v (ml dl−1)	14.2 ± 0.5	14.4 ± 0.3	15.2 ± 0.7
Peak HR (beats min–1)	195 ± 3	194 ± 3	196 ± 4
Peak (l min−1)	12.62 ± 0.58†	13.57 ± 0.64**†	15.79 ± 1.02
Peak SV (ml)	65 ± 3††	70 ± 3*††	80 ± 5
Peak lactate (mmol)	7.91 ± 0.45	7.87 ± 0.33	9.55 ± 1.36

Values are means ± SEM. *P < 0.05 and **P < 0.01 compared with pre-training in POTS. †P < 0.05 and ††P < 0.01 compared with controls.