Fig. 3.

Representative examples illustrating the impact of cervical HF-ES on phrenic and XII nerve activity. Following a left-sided C2 spinal cord hemisection injury, HF-ES was delivered to the ventrolateral epidural surface of the C4 spinal cord, ipsilateral to the side of injury. A: representative compressed traces depict integrated (∫)phrenic and hypoglossal (XII) nerve activity before and after HF-ES at 100, 500, and 1,000 µA from a rat that is 12 wk post-C2Hx. B: expanded traces depict both raw and integrated phrenic and hypoglossal nerve activity at baseline and following each bout of stimulation. Scale bars represent 1 min (A) and 1 s (B).