Bibliographic Details
| Title: |
Limited Effect of 60-Days Strict Head Down Tilt Bed Rest on Vascular Aging |
| Authors: |
Stefan Möstl, Stefan Orter, Fabian Hoffmann, Martin Bachler, Bernhard Hametner, Siegfried Wassertheurer, Jérémy Rabineau, Edwin Mulder, Bernd Johannes, Jens Jordan, Jens Tank |
| Source: |
Frontiers in Physiology, Vol 12 (2021) |
| Publisher Information: |
Frontiers Media S.A., 2021. |
| Publication Year: |
2021 |
| Collection: |
LCC:Physiology |
| Subject Terms: |
pre-ejection period, pulse wave arrival time, pulse wave velocity, artificial gravity, AGBRESA, arterial stiffness, Physiology, QP1-981 |
| More Details: |
BackgroundCardiovascular risk may be increased in astronauts after long term space flights based on biomarkers indicating premature vascular aging. We tested the hypothesis that 60 days of strict 6° head down tilt bed rest (HDTBR), an established space analog, promotes vascular stiffening and that artificial gravity training ameliorates the response.MethodsWe studied 24 healthy participants (8 women, 24–55 years, BMI = 24.3 ± 2.1 kg/m2) before and at the end of 60 days HDTBR. 16 subjects were assigned to daily artificial gravity. We applied echocardiography to measure stroke volume and isovolumetric contraction time (ICT), calculated aortic compliance (stroke volume/aortic pulse pressure), and assessed aortic distensibility by MRI. Furthermore, we measured brachial-femoral pulse wave velocity (bfPWV) and pulse wave arrival times (PAT) in different vascular beds by blood pressure cuffs and photoplethysmography. We corrected PAT for ICT (cPAT).ResultsIn the pooled sample, diastolic blood pressure (+8 ± 7 mmHg, p < 0.001), heart rate (+7 ± 9 bpm, p = 0.002) and ICT (+8 ± 13 ms, p = 0.036) increased during HDTBR. Stroke volume decreased by 14 ± 15 ml (p = 0.001). bfPWV, aortic compliance, aortic distensibility and all cPAT remained unchanged. Aortic area tended to increase (p = 0.05). None of the parameters showed significant interaction between HDTBR and artificial gravity training.Conclusion60 days HDTBR, while producing cardiovascular deconditioning and cephalad fluid shifts akin to weightlessness, did not worsen vascular stiffness. Artificial gravity training did not modulate the response. |
| Document Type: |
article |
| File Description: |
electronic resource |
| Language: |
English |
| ISSN: |
1664-042X |
| Relation: |
https://www.frontiersin.org/articles/10.3389/fphys.2021.685473/full; https://doaj.org/toc/1664-042X |
| DOI: |
10.3389/fphys.2021.685473 |
| Access URL: |
https://doaj.org/article/fb38c1d368b341baabb180b629549acf |
| Accession Number: |
edsdoj.fb38c1d368b341baabb180b629549acf |
| Database: |
Directory of Open Access Journals |
