Table 2.
Selected peak exercise data in patients, split according to diagnosis, sex, and slope of the cardiac output–oxygen uptake relationship during exercise (in POTS patients only)
| POTS | Chronic fatigue | |||||
|---|---|---|---|---|---|---|
Normal 
|
Hyperkinetic | |||||
| M | F | M | F | M | F | |
| ||||||
| mL·kg−1·min−1 | 33.8 ± 8.2 | 31.3 ± 6.2* | 34.0 ± 7.6 | 27.9 ± 6.5* | 36.1 ± 8.2 | 27.4 ± 6.0 |
| L·min−1 | 2.11 ± 0.60 | 1.86 ± 0.44 | 2.51 ± 0.38 | 1.63 ± 0.41 | 2.46 ± 0.57 | 1.64 ± 0.32 |
| Work | ||||||
| Watts | 150 ± 50 | 138 ± 30 | 184 ± 315 | 125 ± 31 | 170 ± 46 | 127 ± 26 |
| % predicted | 60 ± 23 | 77 ± 17 | 59 ± 14 | 73 ± 23 | 71 ± 19% | 76 ± 25% |
| HR | ||||||
| Beats·min−1 | 186 ± 17 | 187 ± 11 | 190 ± 11 | 189 ± 8 | 189 ± 10 | 187 ± 13 |
| O2 pulse | ||||||
| mL·beat−1 | 11.3 ± 3.0 | 9.3 ± 2.3 | 11.7 ± 3.8 | 8.7 ± 2.2 | 13.1 ± 3.2 | 8.8 ± 1.6 |
| VAT | ||||||
% peak 
|
58 ± 9 | 58 ± 8 | 53 ± 6 | 58 ± 7 | 55 ± 12% | 61 ± 8% |
*
P < 0.02 girls with hyperkinetic circulation versus normal cardiac output.