Gluteal muscle atrophy and increased intramuscular lipid concentration are not mitigated by daily artificial gravity following 60-day head-down tilt bed rest

De Martino, Enrico, Tran, Vienna, Hides, Julie, Cable, Gordon, Elliott, James, Hoggarth, Mark, Zange, Jochen, Lindsay, Kirsty, Debuse, Dorothée, Winnard, Andrew, Beard, David, Cook, Jonathan A., Salomoni, Sauro Emerick, Weber, Tobias, Scott, Jonathan, Hodges, Paul W. and Caplan, Nick (2021) Gluteal muscle atrophy and increased intramuscular lipid concentration are not mitigated by daily artificial gravity following 60-day head-down tilt bed rest. Frontiers in Physiology, 12. p. 745811. ISSN 1664-042X

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Exposure to spaceflight and head-down tilt (HDT) bed rest leads to decreases in the mass of the gluteal muscle. Preliminary results have suggested that interventions, such as artificial gravity (AG), can partially mitigate some of the physiological adaptations induced by HDT bed rest. However, its effect on the gluteal muscles is currently unknown. This study investigated the effects of daily AG on the gluteal muscles during 60-day HDT bed rest. Twenty-four healthy individuals participated in the study: eight received 30 minutes of continuous AG; eight received 6x5 minutes of AG, interspersed with rest periods; eight belonged to a control group. T1-Weighted Dixon magnetic resonance imaging of the hip region was conducted at baseline and day 59 of HDT bed rest to establish changes in volumes and intramuscular lipid concentration (ILC). Results showed that, across groups, muscle volumes decreased by 9.2 for gluteus maximus (GMAX), 8.0 for gluteus medius (GMED), and 10.5 for gluteus minimus after 59-day HDT bed rest (all P<0.005). The ILC increased by 1.3 for GMAX and 0.5 for GMED (both P<0.05). Neither of the AG protocols mitigated deconditioning of the gluteal muscles. Whereas all gluteal muscles atrophied, the ratio of lipids to intramuscular water increased only in GMAX and GMED muscles. These changes could impair the function of the hip joint and increased the risk of falls. The deconditioning of the gluteal muscles in space may negatively impact the hip joint stability of astronauts when reexpose to terrestrial gravity.

Item Type: Article
Additional Information: Funding information: The AGBRESA study was funded by the German Aerospace Center, the European Space Agency (4000113871/15/NL/PG), and the National Aeronautics and Space Administration (80JSC018P0078). The study was performed at the “:envihab” research facility of the DLR Institute of Aerospace Medicine. Funding for this ESA-selected project (ESA-HSO-U-LE-0629) was received from the STFC/UK Space Agency (ST/R005753/1). PH was supported by the National Health and Medical Research Council of Australia (APP1194937).
Uncontrolled Keywords: AGBRESA bed rest, Dixon sequence, Short-arm centrifugation, Intramuscular fatty infiltration, Gluteal muscles, muscle atrophy
Subjects: B100 Anatomy, Physiology and Pathology
C600 Sports Science
Department: Faculties > Health and Life Sciences > Sport, Exercise and Rehabilitation
Depositing User: Elena Carlaw
Date Deposited: 13 Oct 2021 15:01
Last Modified: 11 Nov 2021 09:15

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