Effects of 30 days bed rest and exercise countermeasures on PBMC bioenergetics.
PBMC
blood cell bioenergetics
countermeasure
exercise
head-down tilt bed rest
mitochondrial function
simulated microgravity
spaceflight
Journal
Acta physiologica (Oxford, England)
ISSN: 1748-1716
Titre abrégé: Acta Physiol (Oxf)
Pays: England
ID NLM: 101262545
Informations de publication
Date de publication:
31 Jan 2024
31 Jan 2024
Historique:
revised:
27
12
2023
received:
10
11
2023
accepted:
08
01
2024
medline:
31
1
2024
pubmed:
31
1
2024
entrez:
31
1
2024
Statut:
aheadofprint
Résumé
Altered mitochondrial function across various tissues is a key determinant of spaceflight-induced physical deconditioning. In comparison to tissue biopsies, blood cell bioenergetics holds promise as a systemic and more readily accessible biomarker, which was evaluated during head-down tilt bed rest (HDTBR), an established ground-based analog for spaceflight-induced physiological changes in humans. More specifically, this study explored the effects of HDTBR and an exercise countermeasure on mitochondrial respiration in peripheral blood mononuclear cells (PBMCs). We subjected 24 healthy participants to a strict 30-day HDTBR protocol. The control group (n = 12) underwent HDTBR only, while the countermeasure group (n = 12) engaged in regular supine cycling exercise followed by veno-occlusive thigh cuffs post-exercise for 6 h. We assessed routine blood parameters 14 days before bed rest, the respiratory capacity of PBMCs via high-resolution respirometry, and citrate synthase activity 2 days before and at day 30 of bed rest. We confirmed PBMC composition by flow cytometry. The change of the PBMC maximal oxidative phosphorylation capacity (OXPHOS) amounted to an 11% increase in the countermeasure group, while it decreased by 10% in the control group (p = 0.04). The limitation of OXPHOS increased in control only while other respiratory states were not affected by either intervention. Correlation analysis revealed positive associations between white blood cells, lymphocytes, and basophils with PBMC bioenergetics in both groups. This study reveals that a regular exercise countermeasure has a positive impact on PBMC mitochondrial function, confirming the potential application of blood cell bioenergetics for human spaceflight.
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
e14102Informations de copyright
© 2024 The Authors. Acta Physiologica published by John Wiley & Sons Ltd on behalf of Scandinavian Physiological Society.
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