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A wide range of baroreflex stimulation does not alter forearm blood flow |
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| Authors: | Reuben Howden J. Timothy Lightfoot Michael J. Turner Stephen J. Brown Ian L. Swaine |
| Affiliation: | (1) Physiology of Exercise, De Montfort University, Lansdowne Road, Bedford, UK;(2) Department of Health Promotion and Kinesiology, University of North Carolina, 9201 University City Boulevard, Charlotte, North Carolina, USA;(3) Canterbury Christ Church University College, North Holmes Road, Canterbury, UK;(4) Present address: National Institute of Environmental Health Sciences, National Institutes of Health, 111 T.W. Alexander Drive, Building 101, MD D2–01, Research Triangle Park, NC 27709, USA |
| Abstract: | The contribution to the regulation of forearm blood flow (FBF) by different baroreceptor populations has previously only been studied over a limited range of stimuli. Therefore, FBF and R-R interval were recorded during neck suctions and neck pressures ranging from –60 to +40 mmHg. The change in R-R interval (  R-R) during neck suction was significantly increased at each stage when compared to the control (P<0.05). R-R did not show any significant change during any of the neck pressure stages (P>0.05). Suction or pressure applied to the neck did not elicit any significant changes in FBF when compared to the control (P>0.05). These data show that widening the range of applied stimuli to carotid sinus baroreceptors does not induce a change in FBF. However, the small transient changes reported previously cannot be discounted. |
| Keywords: | Carotid sinus baroreflex Neck chamber Venous occlusion plethysmography |
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