Figure 3.

Spinal locomotor-like activity may be initiated in relation to Mayer waves. (A) Three Mayer wave cycles are illustrated, where these consisted of relatively short-lasting hypotensive phases from a more steady value. Note that intermittent nerve discharges commence at the BP increase and cease at the BP drop. The alternation between discharges in the different nerves during these periods is seen better in the expanded sweep in (B) [from the period marked by the dotted rectangle in (A)]. Note that TA and GS were co-activated in this example, though alternating with PBSt. Also note that the intensity of the PBSt (and partly TA) discharges were also modulated according to the respiratory cycle [approximately one respiratory cycle included in (B)].