Figure 1 .

(A) Representative raw traces of EMG activity of the right (R) and left (L) hemidiaphragm of a control rat, immediately after C2 hemisection (acute), 1 week following C2 hemisection, and 16 weeks following C2 hemisection. Note the absence of EMG activity ipsilateral to SCI in animals immediately following hemisection (R) and 1 week following hemisection (R); only EKG activity is visible. By 16 weeks, spontaneous activation of crossed phrenic pathways occurs and activity is recorded in the hemidiaphragm ipsilateral to the SCI (L). (B) A 10-minute representative trace of the working hemidiaphragm from a 1-week hemisected rat showing the stability of the preparation over time.