Abstract
Introduction
Experiments during spaceflight and simulated microgravity as head-down tilt bedrest, demonstrated the role of arterial stiffness among others, in microgravity induced cardiovascular pathologies and emphasized the need for a robust countermeasure.
Aim
The purpose of the present study was to evaluate the use of a new countermeasure, consisting of a high intensity Reactive Sledge (RSL) jumps training protocol, to counteract changes in arterial stiffness during long term head down tilt bedrest (LTBR).
Methods
The participants enrolled in the study were 23 male, healthy volunteers, aged between 20 and 45 years, subjected to LTBR for 60 days and randomly assigned either to a control (11) or to a training sledge (12) group using RSL 3–4 times per week, as a countermeasure. Recorded values were systolic and diastolic blood pressure, heart rate and the user’s arterial stiffness index.
Results
Compared to baseline measurements, there was a deterioration in the values of arterial stiffness, systolic and diastolic blood pressure and heart rate, in both groups until day 35 of LTBR, interpreted as adaptation to the microgravity environment. From this day until the end of the experiment, arterial stiffness of the control group was constantly fluctuating, while constantly improving for the training group. During the recovery period, arterial stiffness values returned to the pre-experimental levels in both groups.
Conclusions
Overall, arterial stiffness increased the longer the time spent in LTBR and the countermeasure was partially effective in preventing the observed phenomenon.
German Clinical Trials Register (DRKS), DRKS00012946, September 18, 2017, retrospectively registered
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Funding
This bed rest study was funded by the European Space Agency (4000113871-15-NL). The construction of the sledge jump system was also funded by the European Space Agency (ESA Life Sciences Program TEC/MMG/2006/82).
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There are no conflicts of interest.
Ethics approval
This study was performed in line with the principles of the Declaration of Helsinki. Approval was granted by the ethics committee of the Northern Rhine Medical Association (Arztekammer Nordrhein) in Duesseldorf, Germany, and the Federal Office for Radiation Protection (Bundesamt für Strahlenschutz).
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After being fully informed of procedures and aims of the study, all participants signed a written informed consent, valid for all the experimental aspects of the study.
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Data supporting the conclusions of this article will be made available by the corresponding author upon request.
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Krachtis, A., Karkala, A., Frantzidis, C.A. et al. Arterial Stiffness Alterations in Simulated Microgravity and Reactive Sledge as a Countermeasure. High Blood Press Cardiovasc Prev 29, 65–74 (2022). https://doi.org/10.1007/s40292-021-00486-2
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DOI: https://doi.org/10.1007/s40292-021-00486-2