Change search
ReferencesLink to record
Permanent link

Direct link
The arterial baroreflex and inherent G tolerance
KTH, School of Technology and Health (STH), Basic Science and Biomedicine, Environmental Physiology.ORCID iD: 0000-0001-6361-8965
KTH, School of Technology and Health (STH), Basic Science and Biomedicine, Environmental Physiology.
Show others and affiliations
2016 (English)In: European Journal of Applied Physiology, ISSN 1439-6319, E-ISSN 1439-6327, 1-9 p.Article in journal (Refereed) Epub ahead of printText
Abstract [en]

Purpose: High G tolerance is based on the capacity to maintain a sufficient level of arterial pressure (AP) during G load; therefore, we hypothesized that subjects with high G tolerance (H group) would have stronger arterial baroreflex responses compared to subjects with low G tolerance (L group). The carotid baroreflex was evaluated using the neck pressure method (NP), which assesses open-loop responses. Methods: The carotid baroreflex was tested in 16 subjects, n = 8 in the H and L group, respectively, in the supine and upright posture. Heart rate and AP were measured. Results: There were no differences between groups in the maximum slopes of the carotid baroreflex curves. However, the H group had a larger systolic and mean AP (SAP, MAP) increase to the initial hypotensive stimuli of the NP sequence in the upright position compared to the L group, 7.5 ± 6.6 vs 2.0 ± 2.4 and 4.1 ± 3.4 vs 1.1 ± 1.1 mmHg for SAP and MAP, respectively. Furthermore, the L group exhibited an increased latency between stimuli and response in AP in the upright compared to supine position, 4.1 ± 1.0 vs 3.1 ± 0.9 and 4.7 ± 1.1 vs 3.6 ± 0.9 s, for SAP and MAP. No differences in chronotropic responses were observed between the groups. Conclusions: It is concluded that the capacity for reflexive vasoconstriction and maintained speed of the vascular baroreflex during orthostatic stress are coupled to a higher relaxed GOR tolerance.

Place, publisher, year, edition, pages
Springer Berlin/Heidelberg, 2016. 1-9 p.
Keyword [en]
Acceleration, Arterial pressure, Baroreflex, G tolerance, Posture
National Category
URN: urn:nbn:se:kth:diva-187073DOI: 10.1007/s00421-016-3375-1OAI: diva2:929197

QC 20160518

Available from: 2016-05-18 Created: 2016-05-17 Last updated: 2016-05-18Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Sundblad, PatrikKölegård, RogerEiken, Ola
By organisation
Environmental Physiology
In the same journal
European Journal of Applied Physiology

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 3 hits
ReferencesLink to record
Permanent link

Direct link