TABLE 3.

The relationship between diaphragm electromyogram (EMG_di) % of maximum (% max) and parasternal intercostal muscle electromyogram measured using surface electrodes (sEMG_para) % max at Borg score 1 during exercise and resting lung function, measured in 15 patients with cystic fibrosis

	EMGdi % max		sEMGpara % max
	Pearson's correlation r	p-value	Pearson's correlation r	p-value
FEV1 % pred	−0.664	0.007	0.212	0.449
VC % pred	−0.672	0.006	0.130	0.643
FEV1/VC	−0.423	0.115	0.334	0.223
TLC % pred	0.271	0.323	0.343	0.211
RV % pred	0.493	0.062	−0.055	0.470
RV/TLC	0.710	0.003	−0.102	0.71

FEV₁: forced expiratory volume in 1 s; % pred: % predicted; VC: vital capacity; TLC: total lung capacity; RV: residual volume.