geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Forearm vascular and neuroendocrine responses to graded water immersion in humans


, : Forearm vascular and neuroendocrine responses to graded water immersion in humans. Acta Physiologica Scandinavica 169(2): 87-94

The hypothesis that graded expansion of central blood volume by water immersion to the xiphoid process and neck would elicit a graded decrease in forearm vascular resistance was tested. Central venous pressure increased (P < 0.05) by 4.2 +/- 0.4 mmHg (mean +/- SEM) during xiphoid immersion and by 10.4 +/- 0.5 mmHg during neck immersion. Plasma noradrenaline was gradually suppressed (P < 0.05) by 62 +/- 8 and 104 +/- 11 pg mL-1 during xiphoid and neck immersion, respectively, indicating a graded suppression of sympathetic nervous activity. Plasma concentrations of arginine vasopressin were suppressed by 1.5 +/- 0.5 pg mL-1 (P < 0.05) during xiphoid immersion and by 2.0 +/- 0.5 pg mL-1 during neck immersion (P < 0.05 vs. xiphoid immersion). Forearm subcutaneous vascular resistance decreased to the same extent by 26 +/- 9 and 28 +/- 4% (P < 0.05), respectively, during both immersion procedures, whereas forearm skeletal muscle vascular resistance declined only during neck immersion by 27 +/- 6% (P < 0.05). In conclusion, graded central blood volume expansion initiated a graded decrease in sympathetic nervous activity and AVP-release. Changes in forearm subcutaneous vascular resistance, however, were not related to the gradual withdrawal of the sympathetic and neuroendocrine vasoconstrictor activity. Forearm skeletal muscle vasodilatation exhibited a more graded response with a detectable decrease only during immersion to the neck. Therefore, the forearm subcutaneous vasodilator response reaches saturation at a lower degree of central volume expansion than that of forearm skeletal muscle.

US$19.90

PMID: 10848638

DOI: 10.1046/j.1365-201x.2000.00680.x


Other references

Cressie Noel, 1998: Aggregation and interaction issues in statistical modeling of spatiotemporal processes. The intention of this short paper is to bring some important statistical issues concerning spatiotemporal stratification, aggregation, and interaction to a community that might otherwise be unaware of them. While no comprehensiveness is claimed, t...

García Alonso, E.; de Francisco Velasco, S.; Polo Polo, M.J.; Sanz Cantalapiedra, R., 2003: Bed-side evaluation of chronic cardiac failure. Atencion Primaria 31(7): 463-4; Author Reply 464-5

Gimenez, M.; Mohan-Kumar, T.; Humbert, J.C.; D.T.lance, N.; Teboul, M.; Ariño Belenguer, F.J., 1987: Training and leucocyte, lymphocyte and platelet response to dynamic exercise. Journal of Sports Medicine and Physical Fitness 27(2): 172-177

Aguilera J.M.; Lusas E.W., 1986: Laboratory and pilot solvent extraction of extruded high oil corn. Oil extraction of flakes and extrudates of high-oil (HO) corn was studied, using hexane as solvent. HO corn contained 19.5% oil, 70% of which was located in the germ. Microstructures of starchy endosperm and germ were analyzed by scanning electron...

Makkamov, E.U.; Ubaĭdullaev, M.B.; Mamedov, T.G., 1989: Evaluation of the status of the palatopharyngeal area in children with congenital penetrating cleft palate. Gypsum models were constructed to study the transversal pharynx width and palate defect in 57 children with congenital opened palate clefts. Age-dependent increase in the defect width was noted and attributed to muscular dystrophy in the soft pala...

Filippovich, V.A.; Strotskii, A.V., 1996: Some peculiarities of the multiple bladder tumors recurrence. The long-term (5 year) results of treating 180 patients with single and multiple bladder tumors have been studied. Multiple tumors in phases pN1N0M0, pT2N0M0 have been revealed to be more unfavourable in prognosis of recurrences development than s...

Wang, Y.; Zhao, B.; Ma, H-Rong.; Aisa, H.Akber., 2016: Two new sesquiterpenoid glycosides from the leaves of Lycium barbarum. Two new sesquiterpenoid glycosides, lyciumionosides A-B (1-2), together with four known compounds (3-6), were isolated from the leaves of Lycium barbarum. Their structures were mainly established on the basis of MS, 1D and 2D NMR spectroscopic tec...

Nishikura, K.; Sugita, Y.; Nagai, M.; Yoneyama, Y.; Jagenburg, R., 1975: High cooperativity of haemoglobin M Boston in the completely reduced state. Nature 254(5502): 727-728

Khorashadi, L.; Ha, A.S.; Chew, F.S., 2012: Radiologic guide to surgical treatment of first carpometacarpal joint osteoarthritis. The purpose of this article is to provide a radiologic guide to surgical treatment of first carpometacarpal osteoarthritis, a common problem especially in older women.Knowledge of the indications, surgical technique, component design, normal posto...

Schmitt, C.N.Z.; Winter, A.; Bertinetti, L.; Masic, A.; Strauch, P.; Harrington, M.J., 2016: Mechanical homeostasis of a DOPA-enriched biological coating from mussels in response to metal variation. Protein-metal coordination interactions were recently found to function as crucial mechanical cross-links in certain biological materials. Mussels, for example, use Fe ions from the local environment coordinated to DOPA-rich proteins to stiffen th...