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PREDICTIVE STUDIES VII (PS VII): Interactions of Hyperoxia, Exercise, and Immersion in Neurologic O2 Poisoning.
Major Category: Oxygen toxicity and oxygenation. Immersion. Exercise. (PS VII)
Subcategory 3: Brain blood flow velocity responses to hypercapnia at rest and during exercise at 1.0 ATA.

Stressors: hypercapnia, exercise

Date: 1992

Expt. Title: Correlated measurements of ventilatory, cardiac and brain blood flow velocity responses to hypercapnia during O2 breathing at rest and during exercise. (Expt. 13.14)

Description:

See PS VII experiments protocols. Reports. Measurements in 7 Subjects at rest and during exercise while breathing 100% O2, 3% CO2 in O2, and 5% CO2 in O2. Imposed bicycle ergometer workload setting of 100 watts gave average O2 uptake rate of 1.35 l/min., while average P_aO2 ranged from about 38 to 45 mm Hg at rest and from 41 to 52 mm Hg during exercise.

Measurements:

MCA blood flow velocity, arterial and end-tidal PCO2, arterial PO2 and pH, heart rate, systolic and diastolic blood pressures, rates of O2 uptake and CO2 elimination.

REPORT: Stevens, W.C., J.M. Clark, R. Gelfand, G. Beck, M. Stierheim, R.E. Farber, and C.J. Lambertsen. Relationships of brain blood velocity to arterial PCO2 at rest and during exercise (ABSTRACT). Med. Sci. Sports Exer. 25(5): S55, 1993.

07 February 2000 11:06:59 AM