Journal of Applied Physiology Fuel your research with LabChart
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

J Appl Physiol 65: 2190-2194, 1988;
8750-7587/88 $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 Barney, J. A.
Right arrow Articles by Smith, J. J.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Barney, J. A.
Right arrow Articles by Smith, J. J.

Journal of Applied Physiology, Vol 65, Issue 5 2190-2194, Copyright © 1988 by American Physiological Society

ARTICLES

Carotid baroreflex responsiveness in high-fit and sedentary young men

J. A. Barney, T. J. Ebert, L. Groban, P. A. Farrell, C. V. Hughes and J. J. Smith
Department of Physiology, Medical College of Wisconsin, Milwaukee.

The influence of fitness on cardiac vagal activity and baroreflex-mediated control of heart rate has not been clearly established in humans. Therefore, we studied resting cardiac vagal activity by evaluating respiratory sinus arrhythmia (RSA) and examined carotid-cardiac baroreflex responsiveness with a neck collar in 11 high-fit and 9 sedentary [based on maximal O2 consumption (VO2max) and history of physical activity] healthy young men (19-31 yr of age). Resting cardiac vagal activity was determined from the standard deviation of 100 consecutive resting R-R intervals. Baroreflex responsiveness was determined from the R-R interval responses to neck suction and pressure (repeated trials of 5-s stimuli of -20, -40, and 35 mmHg). Both RSA and the bradycardic (R-R interval) responses to neck suction of -40 mmHg were significantly greater (P less than 0.05) in the high-fit individuals (RSA, 116.5 +/- 11.5 ms; neck-suction response, 145.3 +/- 17.0 ms; mean +/- SE) compared with sedentary subjects (RSA, 65.2 +/- 6.6 ms; neck-suction response, 86.9 +/- 12.5 ms). Responses of the high-fit volunteers to the other intensities of neck stimuli (-20 and 35 mmHg) showed a similar trend but were not significantly different from those of the sedentary volunteers. The baroreflex slope derived from these data was significantly greater in the high-fit subjects (4.00 +/- 0.39 ms/mmHg) compared with the sedentary controls (2.53 +/- 0.28 ms/mmHg). These data suggest that resting cardiac vagal activity is greater, carotid-to-cardiac activity is well maintained, and baroreflex sensitivity, i.e., slope, is augmented in high-fit subjects.


This article has been cited by other articles:


Home page
 J. Appl. Physiol.Home page
K. De Angelis, R. B. Wichi, W. R. A. Jesus, E. D. Moreira, M. Morris, E. M. Krieger, and M. C. Irigoyen
Exercise training changes autonomic cardiovascular balance in mice
J Appl Physiol, June 1, 2004; 96(6): 2174 - 2178.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
K.-i. Iwasaki, R. Zhang, J. H. Zuckerman, and B. D. Levine
Dose-response relationship of the cardiovascular adaptation to endurance training in healthy adults: how much training for what benefit?
J Appl Physiol, October 1, 2003; 95(4): 1575 - 1583.
[Abstract] [Full Text] [PDF]

Home page
 HypertensionHome page
D. D. Christou, P. P. Jones, and D. R. Seals
Baroreflex Buffering in Sedentary and Endurance Exercise-Trained Healthy Men
Hypertension, June 1, 2003; 41(6): 1219 - 1222.
[Abstract] [Full Text] [PDF]


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