Table 1.

Effects of dihydrexidine (DHD) on phrenic nerve activity

Parameters	Control	DHD	P, t-test*
Cycle frequency, cycles·min−1	16.2±1.4	14.4±1.4	0.007†
Peak AP frequency‡	983±49.6	1162±73.2	0.030†
Inspiratory phase, s§	1.55±0.20	1.68±0.19	0.050†
Postinspiratory phase§	0.90±0.15	1.20±0.27	0.290
Expiratory phase§	1.48±0.20	1.51±0.20	0.560

Parameter values are presented as means ± SE; n =7 experiments. DHD doses, 0.8 or 1.0 mg/kg iv.

^*Significance of differences derived from two-tailed t-tests;

^†difference is significant;

^‡peak compound action potential (AP) frequency (APs·s⁻¹) at end of augmenting inspiratory phase discharge;

^§phase durations.