| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
Department of Anatomy and Physiology, Kansas State University, Manhattan, Kansas 66506
Frequency-domain analyses were used to determine the effect of heat stress on the relationships between the discharge bursts of sympathetic nerve pairs and sympathetic and phrenic nerve pairs in chloralose-anesthetized rats. Sympathetic nerve discharge (SND) was recorded from the renal, splanchnic, splenic, and lumbar nerves during increases in core body temperature (Tc) from 38 to 41.4 ± 0.3°C. The following observations were made: 1) hyperthermia transformed the cardiac-related bursting pattern of SND to a pattern that contained low-frequency, non-cardiac-related bursts, 2) the pattern transformation was uniform in regionally selective sympathetic nerves, 3) hyperthermia enhanced the frequency-domain coupling between SND and phrenic nerve bursts, and 4) low-frequency SND bursts recorded during hyperthermia contained significantly more activity than cardiac-related bursts. We conclude that acute heat stress profoundly affects the organization of neural circuits responsible for the frequency components in sympathetic nerve activity and that SND pattern transformation provides an important strategy for increasing the level of activity in sympathetic nerves during increased Tc.
sympathetic nerve activity; autospectral analysis; coherence function; Sprague-Dawley rats; hyperthermia
This article has been cited by other articles:
|
|
 |
|
  B. G. Helwig, S. Parimi, C. K. Ganta, R. Cober, R. J. Fels, and M. J. Kenney Aging alters regulation of visceral sympathetic nerve responses to acute hypothermia Am J Physiol Regulatory Integrative Comp Physiol, September 1, 2006; 291(3): R573 - R579. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
D. Bertram, V. Orea, B. Chapuis, C. Barres, and C. Julien Differential responses of frequency components of renal sympathetic nerve activity to arterial pressure changes in conscious rats Am J Physiol Regulatory Integrative Comp Physiol, October 1, 2005; 289(4): R1074 - R1082. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 N. Lu, B. G. Helwig, R. J. Fels, S. Parimi, and M. J. Kenney Central Tempol alters basal sympathetic nerve discharge and attenuates sympathetic excitation to central ANG II Am J Physiol Heart Circ Physiol, December 1, 2004; 287(6): H2626 - H2633. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 C. K. Ganta, F. Blecha, R. R. Ganta, B. G. Helwig, S. Parimi, N. Lu, R. J. Fels, T. I. Musch, and M. J. Kenney Hyperthermia-enhanced splenic cytokine gene expression is mediated by the sympathetic nervous system Physiol Genomics, October 4, 2004; 19(2): 175 - 183. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. J. Kenney and T. I. Musch Senescence alters blood flow responses to acute heat stress Am J Physiol Heart Circ Physiol, April 1, 2004; 286(4): H1480 - H1485. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 M. J. Kenney and R. J. Fels Forebrain and brain stem neural circuits contribute to altered sympathetic responses to heating in senescent rats J Appl Physiol, November 1, 2003; 95(5): 1986 - 1993. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. J. Kenney, M. L. Weiss, T. Mendes, Y. Wang, and R. J. Fels Role of paraventricular nucleus in regulation of sympathetic nerve frequency components Am J Physiol Heart Circ Physiol, May 1, 2003; 284(5): H1710 - H1720. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. J. Kenney and R. J. Fels Sympathetic nerve regulation to heating is altered in senescent rats Am J Physiol Regulatory Integrative Comp Physiol, August 1, 2002; 283(2): R513 - R520. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. J. Kenney, F. Blecha, Y. Wang, R. McMurphy, and R. J. Fels Sympathoexcitation to intravenous interleukin-1beta is dependent on forebrain neural circuits Am J Physiol Heart Circ Physiol, August 1, 2002; 283(2): H501 - H505. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. J. Kenney, F. Blecha, R. J. Fels, and D. A. Morgan Altered frequency responses of sympathetic nerve discharge bursts after IL-1beta and mild hypothermia J Appl Physiol, July 1, 2002; 93(1): 280 - 288. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. J. Kenney, M. L. Weiss, K. P. Patel, Y. Wang, and R. J. Fels Paraventricular nucleus bicuculline alters frequency components of sympathetic nerve discharge bursts Am J Physiol Heart Circ Physiol, September 1, 2001; 281(3): H1233 - H1241. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. J. Kenney, T. I. Musch, and M. L. Weiss Renal sympathetic nerve regulation to heating is altered in rats with heart failure Am J Physiol Heart Circ Physiol, June 1, 2001; 280(6): H2868 - H2875. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. L. Mathai, T. Hubschle, and M. J. McKinley Central angiotensin receptor blockade impairs thermolytic and dipsogenic responses to heat exposure in rats Am J Physiol Regulatory Integrative Comp Physiol, November 1, 2000; 279(5): R1821 - R1826. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. J. Kenney, J. G. Pickar, M. L. Weiss, C. S. Saindon, and R. J. Fels Effects of midbrain and spinal cord transections on sympathetic nerve responses to heating Am J Physiol Regulatory Integrative Comp Physiol, May 1, 2000; 278(5): R1329 - R1338. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
M. J. Kenney, D. E. Claassen, R. J. Fels, and C. S. Saindon Cold stress alters characteristics of sympathetic nerve discharge bursts J Appl Physiol, August 1, 1999; 87(2): 732 - 742. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
| Visit Other APS Journals Online |
