CO2 Retention and ECG Changes in Exercise during Prolonged Hyperbaric N2-O2 Breathing
NAVAL SUBMARINE MEDICAL RESEARCH LAB GROTON CT
Pagination or Media Count:
Respiratory function VE, VO2, VCO2, r and PACO2 was measured in tne subjects at rest and exercise during prolonged hyperbaric chamber exposure to 2. 52, 2.82, 4.03, and 7.00 atmospheres absolute ATA. At 4.03 ATA, the ventilatory response to exercise was found depressed at 150 watts. Increased PACO2 indicated CO2 retention. At 7.00 ATA there was a slight but significant elevation of PACO2 at rest and a depression of the ventilatory response to exercise at both 50 and 125 watts associated with a marked CO2 retention. Arrhythmias were found at 4.03 and 7.00 ATA with workloads of 150 and 125 watts, respectively. At 4.03 ATA, premature atrial contractions PAC were noted at 150 watts in two subjects during four separate testing sessions. At 7.00 ATA, PACs were observed at 125 watts in two subjects. One subject developed premature ventricular contractions PVCs during three different tests at 125 watts. Arrhythmias occurred only in those exercise tests which produced a marked CO2 retention at increased pressure.
- Stress Physiology