Table 2. Correlations of the six-minute walk distance with body composition, peripheral muscle performance, and pulmonary function in acromegalic patients.
| Variables | Six-minute walk distance (% predicted) |
|---|---|
| Body composition | |
| Body mass index (kg/m2) | −0.41 |
| Reactance (Ω) | −0.26 |
| Resistance (Ω) | −0.50* |
| Fat percentage (%) | −0.11 |
| Height(2)/resistance index (cm2/ Ω) | 0.52* |
| Fat-free mass (kg) | 0.62*** |
| Peripheral muscle performance | |
| Quadriceps muscle strength (kg) | 0.41 |
| RMS (mV) | −0.09 |
| MDF (Hz) | 0.65*** |
| Pulmonary function | |
| FVC (% predicted) | 0.45 |
| FEV1 (% predicted) | 0.50* |
| FEV1/FVC (%) | 0.30 |
| TLC (% predicted) | 0.40 |
| RV (% predicted) | −0.28 |
| Raw (cm H2O/L/s) | −0.08 |
| DLco (% predicted) | 0.35 |
| MIP (% predicted) | 0.43 |
| MEP (% predicted) | 0.60** |
RMS: angle of the linear regression line obtained using the values of the root mean square electromyography signal over time during the fatigability test for the vastus medialis muscle; MDF: angle of the linear regression line obtained using the values of the median frequency electromyography signal over time during the fatigability test for the vastus medialis muscle; FVC: forced vital capacity; FEV1: forced expiratory volume in 1 second; TLC: total lung capacity; RV: residual volume; Raw: airway resistance; DLco: diffusing capacity for carbon monoxide; MIP: maximal inspiratory pressure; MEP: maximal expiratory pressure. *p<0.05, **p<0.01, ***p<0.005