NDLI: Effect of sex and ovarian hormones on carotid baroreflex resetting and function during dynamic exercise in humans

Content Provider	PubMed Central
Author	Kim, Areum Deo, Shekhar H. Fisher, James P. Fadel, Paul J.
Copyright Year	2012
Abstract	To date, no studies have examined whether there are either sex- or ovarian hormone-related alterations in arterial baroreflex resetting and function during dynamic exercise. Thus we studied 16 young men and 18 young women at rest and during leg cycling at 50% heart rate (HR) reserve. In addition, 10 women were studied at three different phases of the menstrual cycle. Five-second pulses of neck pressure (NP) and neck suction (NS) from +40 to −80 Torr were applied to determine full carotid baroreflex (CBR) stimulus response curves. An upward and rightward resetting of the CBR function curve was observed during exercise in all groups with a similar magnitude of CBR resetting for mean arterial pressure (MAP) and HR between sexes (P > 0.05) and at different phases of the menstrual cycle (P > 0.05). For CBR control of MAP, women exhibited augmented pressor responses to NP at rest and exercise during mid-luteal compared with early and late follicular phases. For CBR control of HR, there was a greater bradycardic response to NS in women across all menstrual cycle phases with the operating point (OP) located further away from centering point (CP) on the CBR-HR curve during rest (OP-CP; in mmHg: −13 ± 3 women vs. −3 ± 3 men; P < 0.05) and exercise (in mmHg: −31 ± 2 women vs. −15 ± 3 men; P < 0.05). Collectively, these findings suggest that sex and fluctuations in ovarian hormones do not influence exercise resetting of the baroreflex. However, women exhibited greater CBR control of HR during exercise, specifically against acute hypertension, an effect that was present throughout the menstrual cycle.
Related Links	http://dx.doi.org/10.1152/japplphysiol.01308.2011
Starting Page	1361
File Format	PDF
ISSN	15221601
e-ISSN	15221601
Journal	Journal of Applied Physiology
Issue Number	8
Volume Number	112
Language	English
Publisher	American Physiological Society
Publisher Date	2012-04-15
Access Restriction	Open
Rights Holder	American Physiological Society
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Physiology Physiology (medical) Sports Science

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