Table 1.

Apnea duration between conditions and within apnea series

	Normal breathing (s)	Hyperventilation (s)	Time difference (s)	Time increase (%)
A1	93 ± 48	111 ± 42	18	19
A2	107 ± 51†	127 ± 49 †*	20	19
A3	115 ± 52†	134 ± 52†*	19	16
A4	118 ± 53†	142 ± 58†*	24	20
A5	123 ± 55†	152 ± 60†*	29	24
Mean	111 ± 12	133 ± 6*	22	20

Mean (SD) apnea duration values in seconds for A1–A5. Mean, an average of the five apneas in the same condition

*Significantly different from NB; ^†significantly different from A1 in the same condition. (n = 18)