Evidence map›Paper›PMID 27081163›Full record

ArticlePhysiological reports2016

PlanHab: Hypoxia counteracts the erythropoietin suppression, but seems to exaggerate the plasma volume reduction induced by 3 weeks of bed rest.

Michail E Keramidas, Igor B Mekjavic, Roger Kölegård, Alexander Choukèr, Claudia Strewe, Ola Eiken

Open access · goldAbstract read
In one paragraph

Article in Physiological reports, 2016. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 10 papers.

0numbers the graph read from it
0cells of the map it votes in
10citing papers in PubMed
2.7field-weighted citation impact, top 10% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

10 citing papers in PubMed, 13 citations in OpenAlex.

  1. Trial
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  3. PlanHabThe Journal of physiology · 2018
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4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

6 authors at 4 institutions in 3 countries.

Michail E KeramidasDepartment of Environmental Physiology, Swedish Aerospace Physiology Center, School of Technology and Health, Royal Institute of Technology, Stockholm, Sweden michail.keramidas@sth.kth.se.
Igor B MekjavicDepartment of Automation, Biocybernetics and Robotics, Jozef Stefan Institute, Ljubljana, Slovenia.
Roger KölegårdDepartment of Environmental Physiology, Swedish Aerospace Physiology Center, School of Technology and Health, Royal Institute of Technology, Stockholm, Sweden.
Alexander ChoukèrDepartment of Anaesthesiology, Stress and Immunology Lab, University of Munich, Munich, Germany.
Claudia StreweDepartment of Anaesthesiology, Stress and Immunology Lab, University of Munich, Munich, Germany.
Ola EikenDepartment of Environmental Physiology, Swedish Aerospace Physiology Center, School of Technology and Health, Royal Institute of Technology, Stockholm, Sweden.
KTH Royal Institute of Technology · SEJožef Stefan Institute · SIKatholische Stiftungsfachhochschule München · DELudwig-Maximilians-Universität München · DE

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

The study examined the distinct and synergistic effects of hypoxia and bed rest on the erythropoietin (EPO) concentration and relative changes in plasma volume (PV). Eleven healthy male lowlanders underwent three 21-day confinement periods, in a counterbalanced order: (1) normoxic bed rest (NBR; PIO2: 133.1 ± 0.3 mmHg); (2) hypoxic bed rest (HBR; PIO2: 90.0 ± 0.4 mmHg, ambient simulated altitude of ~4000 m); and (3) hypoxic ambulation (HAMB; PIO2: 90.0 ± 0.4 mmHg). Blood samples were collected before, during (days 2, 5, 14, and 21) and 2 days after each confinement to determineEPOconcentration. Qualitative differences inPVchanges were also estimated by changes in hematocrit and hemoglobin concentration along with concomitant changes in plasma renin concentration.NBRcaused an initial reduction inEPOby ~39% (P = 0.04). By contrast,HBRenhancedEPO(P = 0.001), but the increase was less than that induced byHAMB(P < 0.01). All three confinements caused a significant reduction inPV(P < 0.05), with a substantially greater drop inHBRthan in the other conditions (P < 0.001). Thus, present results suggest that hypoxia prevents theEPOsuppression, whereas it seems to exaggerate thePVreduction induced by bed rest.

Indexed as

Plasma VolumeActivities of Daily LivingAdultBed RestBiomarkersBlood PressureDown-RegulationErythropoietinExerciseHealthy VolunteersHeart RateHumansHypovolemiaHypoxiaMaleMotor ActivityBiomarkersEPO protein, humanErythropoietinOxyhemoglobinsReninBlood volumeconfinementhypovolemiamicrogravityrenin

Identifiers

PMID27081163
PMCPMC4831328
OpenAlexW2336399628

What OpenQuestion holds

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LicenceCC BY
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Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.