Fig. 3.

Alterations in variables of phrenic activity [duration of the phrenic burst (Ti), period between bursts (Te), respiratory frequency (f), and peak height of integrated phrenic discharge, expressed as a percentage of value during eupnea] with change from eupnea (E) to gasping (G) in control (n = 15) and Pet-1 (n = 8) mice. Values are means ± SE. In both groups of mice, Ti and Te were significantly longer in gasping than in eupnea, whereas f was significantly less. Peak height was significantly greater in gasping. *P < 0.05.