Table 1.

Number of motor units recorded across motor behaviors

	Number of Motor Units Discriminated During
Motor Units First Recruited During	Eupnea	Hypoxia-hypercapnia	Deep breath	Airway occlusion
Eupnea	64	55	48	40
Hypoxia-hypercapnia		8	4	4
Deep breath			10
Airway occlusion				16
Total	64	63	62	60

Motor units are segregated according to the motor behavior during which they were first recruited.