NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
'Diving reflex' in man - Its relation to isometric and dynamic exercise.To test the influence of physical activity on the diving reflex, 10 normal men held their breath with their faces immersed in 15 C water during rest, bicycle exercise, and sustained isometric handgrip contraction. At all conditions, a slight but statistically significant elevation of blood pressure and a marked decrease in heart rate occurred during each dive. During moderate bicycle exercise heart rate fell more rapidly than at rest and the final level of bradycardia approached that achieved at rest, despite the fact that predive heart rates were much higher during exercise. When diving occurred in combination with isometric exercise, bradycardia was less severe than during resting dives and final heart rates could be represented as the sum of the expected responses to each intervention alone. In all conditions apnea without face immersion caused bradycardia that was less severe than during wet dives.
Document ID
19720052298
Document Type
Reprint (Version printed in journal)
Authors
Bergman, S. A., Jr.
Campbell, J. K.
Wildenthal, K. (Texas, University Dallas, Tex., United States)
Date Acquired
August 6, 2013
Publication Date
July 1, 1972
Publication Information
Publication: Journal of Applied Physiology
Volume: 33
Subject Category
BIOSCIENCES
Funding Number(s)
CONTRACT_GRANT: NGR-44-012-151
CONTRACT_GRANT: PHS-HL-06296
Distribution Limits
Public
Copyright
Other