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Inter-individual and intra-individual Variation of Spaceflight-induced Muscle Atrophy: Results from the EDOS-2 Study

Böcker, Jonas and Mittag, Uwe and Lau, Patrick and Gordienko, Kirill and Locrelle, Hervé and Vico, Laurence and Vasilieva, Galina and Rittweger, Jörn (2021) Inter-individual and intra-individual Variation of Spaceflight-induced Muscle Atrophy: Results from the EDOS-2 Study. Aerospace and Environmental Medicine. 23. International Symposium Human in Space, 05.-09. April 2021, Moskau, Russland. ISSN 0233-528X.

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Official URL: https://his2021-moscow.confreg.org/userfls/ufiles/Abstract%20Book%20HIS_2021.pdf


During long-term exposure to microgravity multiple musculoskeletal as well as cardiovascular adaptations of the human body including muscular wasting could occur. Due to lower loads of the anti-gravity muscles, especially the lower extremities are affected. To maintain a high level of musculoskeletal fitness, Cosmonauts and Astronauts perform daily exercises. Individual training responses and muscle adaptations are additionally influenced by parameters like body constitution, nutrition, training stimuli and training responses. During our EDOS-2 study we investigated the muscular loss during the long-term space missions despite intensive, high-volume training activities. Twelve Cosmonauts and Astronauts were examined pre- and post-flight. Two baseline measurements (B-90 and B-45) and three post-flight measurements (R+1, R+14, R+90) at Tibia 38% and Tibia 66% were performed. Data acquisition was performed with a peripheral quantitative computer tomography (pQCT). As a parameter for muscular wasting we used the cross-sectional area (CSA) at the two body sites. Percent change (pc) defined as the difference of the post-flight result and the baseline measurement divided by the baseline result was analyzed. Furthermore, we analyzed the correlation by using the Spearman correlation coefficient between the body sites. These results were compared to muscular adaptations after two month of bed rest without any intervention during our AGBRESA study, where we measured the CSA at Tibia 66 at B-13 and BR60. Repeated measures ANOVA indicated significant differences between the study days for both measurement sites (p<0.001), and contrast testing showed significant losses R+1 as well as R+14. Notably, there was no difference between baseline and R+90. The results of the pc showed an overall decrease of 13.6% (± 5.3) from baseline to R+1 and of 6.4 % (± 4.6) from baseline to R+14 for Tibia 38, respectively. For Tibia 66, the results were -12.7 % (± 5.4) at R+1 and -6.4 % (± 4.3) at R+14. In comparison, the pc of CSA at Tibia 66 during two month of bed rest was about -21.0 % (± 4.5) till BR60. The results for pc of baseline to R+1 showed that the individual pc for Cosmonauts and Astronauts ranged from -22.7 % to -5.4 % at Tibia 38 and from -24.4 % to -5.7 % at Tibia 66, respectively. The range during AGBRESA was from -27.5 % to -14.7 % from baseline to BR60. The correlation coefficients for pc at Tibia 38 and Tibia 66 during EDOS-2 were for R+1 at 0.8, R+14 at 0.6 and R+90 0.3. Despite daily activities, these results indicate sustained muscle wasting during long-term space missions. These results showed, that the muscular wasting of a long exposure to microgravity (about 6 month) is comparable to adaptations during two month of bed rest without any intervention. The adaptation at Tibia 38 and Tibia 66 showed a high correlation indicating little intra-limb variation.

Item URL in elib:https://elib.dlr.de/144145/
Document Type:Conference or Workshop Item (Speech)
Title:Inter-individual and intra-individual Variation of Spaceflight-induced Muscle Atrophy: Results from the EDOS-2 Study
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Böcker, JonasUNSPECIFIEDhttps://orcid.org/0000-0002-2388-0384
Mittag, UweUNSPECIFIEDhttps://orcid.org/0000-0002-8580-3085
Lau, PatrickUNSPECIFIEDhttps://orcid.org/0000-0002-7290-5875
Locrelle, HervéLBTO, Faculté de MédicineUNSPECIFIED
Vico, LaurenceLBTO, Faculté de MédicineUNSPECIFIED
Rittweger, JörnUNSPECIFIEDhttps://orcid.org/0000-0002-2223-8963
Date:April 2021
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Page Range:p. 23
Publisher:Aerospace and Environmental Medicine
Keywords:Muscle atrophy, Bone loss, Inter-individual variation, Intra-individual variation
Event Title:23. International Symposium Human in Space
Event Location:Moskau, Russland
Event Type:international Conference
Event Dates:05.-09. April 2021
Organizer:International Academy of Astronautics (IAA)
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Research under Space Conditions
DLR - Research theme (Project):R - Muscle Mechanics and Metabolism
Location: Köln-Porz
Institutes and Institutions:Institute of Aerospace Medicine > Muscle and Bone Metabolism
Deposited By: Böcker, Jonas
Deposited On:28 Sep 2021 08:59
Last Modified:29 Mar 2023 00:49

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