Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Grouped data comparing the CO2 reserve (A) and apneic threshold (B). The bars represent averaged data for each age group (black bar = young, n = 15; gray bar = elderly age, n = 10). The CO2 reserve was reduced in elderly vs. young adults, denoting an increased propensity to central apneas (*P = 0.01). The apneic threshold was significantly reduced in the elderly (§P = 0.049) (see text for explanation).
