Table 3.
Coefficients of variation, reference change values and minimal important differences of cardiac index measurements performed at rest and at 10 Watt pedalling using inert gas rebreathing and impedance cardiography (visit 1 vs. visit 2)
| IGRrest (%) | ICGrest (%) | IGR10W (%) | ICG10W (%) | |
|---|---|---|---|---|
| CVa (%) | 2 | 2 | 2 | 2 |
| CVi (%) | 5.44 (2.82–9.78) | 1.12 (0.65–4.26) | 3.80 (0.86–8.48) | 3.34 (1.76–6.56) |
| CVt (%) | 5.80 (2.99–9.98) | 2.29 (1.19–4.71) | 4.29 (1.32–8.71) | 3.89 (2.02–6.86) |
| RCV (L/min/m2) | 0.33 | 0.10 | 0.34 | 0.28 |
| RCV (% of CI) | 15.14 | 3.32 | 10.59 | 9.33 |
| ICC | 0.532 | 0.689 | 0.780 | 0.665 |
| MID (L/min/m2) | 0.37 | 0.22 | 0.34 | 0.35 |
| MID (% of CI) | 15.87 | 7.76 | 11.02 | 11.78 |
CI, cardiac index; CV, coefficient of variation; CVa, analytical CV; CVi, individual CV; CVt; total CV; ICC, intraclass correlation coefficient; ICGrest, impedance cardiography measured at rest; ICG10W, impedance cardiography measured at 10 Watt pedalling; IGRrest, inert gas rebreathing measured at rest; IGR10W, inert gas rebreathing measured at 10 Watt pedalling; RCV, reference change value; MID, minimal important difference.
Values are represented as median (interquartile range).