Journal of Applied Physiology
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

J Appl Physiol 13: 75-80, 1958;
8750-7587/58 $5.00
This Article
Right arrow Full Text (PDF)
Right arrow Submit a response
Right arrow Alert me when this article is cited
Right arrow Alert me when eLetters are posted
Right arrow Alert me if a correction is posted
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Åstrand, P.-O.
Right arrow Articles by Åstrand, I.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Åstrand, P.-O.
Right arrow Articles by Åstrand, I.

Heart Rate During Muscular Work in Man Exposed to Prolonged Hypoxia

Per-Olof Åstrand 1 and Irma Åstrand 1

1 From the Department of Physiology, University of California, Berkeley, and the White Mountain Research Station, Big Pine, California

Heart rate was recorded on four subjects performing muscular work at sea level, during a 4-week sojourn at 14,250 feet altitude, during reacclimatization to sea level conditions and during acute exposure in an altitude chamber. The heart rate of two of these subjects after acclimatization seemed to approach a relatively low ceiling at high work rates. This probably limited their cardiac output and oxygen transport. It was observed that an increase in oxygen supply (Pio2) during heavy work in these subjects, however, promptly increased the heart rate well above this ceiling (in one case from 138 to more than 160 beats/min. within 15 seconds.) This response was observed only in acclimatized subjects. After reacclimatization to sea level, when acute hypoxia in the altitude chamber was removed by switching to oxygen during work, heart rate invariably decreased.

Submitted on January 27, 1958




This article has been cited by other articles:


Home page
 CirculationHome page
R. Boushel, J.-A. L. Calbet, G. Radegran, H. Sondergaard, P. D. Wagner, and B. Saltin
Parasympathetic Neural Activity Accounts for the Lowering of Exercise Heart Rate at High Altitude
Circulation, October 9, 2001; 104(15): 1785 - 1791.
[Abstract] [Full Text] [PDF]

Home page
 CirculationHome page
A. A. Kouatli, J. A. Garcia, T. M. Zellers, E. M. Weinstein, and L. Mahony
Enalapril Does Not Enhance Exercise Capacity in Patients After Fontan Procedure
Circulation, September 2, 1997; 96(5): 1507 - 1512.
[Abstract] [Full Text]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Visit Other APS Journals Online