The Effect of Microgravity on Parathyroid Hormone Secretion: A Meta-Analysis

Benjamin Shepard Blue

Abstract


Background: The relationship between microgravity and parathyroid hormone (PTH), a keystone of bone mineral density, remains controversial. Bone loss is a prominent, ongoing issue in spaceflight, and PTH has been suggested as a treatment for microgravity-induced osteopenia, indicating the importance of this hormone. This systematic review and meta-analysis aimed to evaluate the association between exposure to microgravity and the production of PTH.

Methods: PubMed, Embase, Scopus, and Google Scholar were searched for studies reporting PTH levels during and after exposure to microgravity. Non-peer-reviewed articles, studies lacking control groups, and articles published earlier than 2002 were excluded. Twelve articles from 2002 to present, with a total of 145 subjects, were identified and the standardized mean differences from baseline PTH levels were combined in a random effects model. Two-way analysis of variance (ANOVA) with Tukey honestly significant difference (HSD) testing on weighted mean differences was conducted to obtain 95% confidence intervals.

Results: Compared to baseline measurements, significant changes in PTH levels are found during and after microgravity exposure. In-flight levels significantly decrease (P < 0.01), and post-flight levels show increases. Furthermore, there is evidence of an interaction between experimental condition (real or simulated microgravity) and time after removal from microgravity on PTH.

Conclusions: The findings of this systematic review and meta-analysis suggest that microgravity affects parathyroid gland function during and after spaceflight, with decreases in function in-flight and an increase at 7 days post-flight. Experimental condition also appears to play a role in the recovery timeline of PTH.




J Endocrinol Metab. 2023;13(1):1-12
doi: https://doi.org/10.14740/jem849

Keywords


Microgravity; Endocrine; Parathyroid; Bone metabolism

Full Text: HTML PDF Suppl1 Suppl2 Suppl3
 

Browse  Journals  

 

Journal of Clinical Medicine Research

Journal of Endocrinology and Metabolism

Journal of Clinical Gynecology and Obstetrics

 

World Journal of Oncology

Gastroenterology Research

Journal of Hematology

 

Journal of Medical Cases

Journal of Current Surgery

Clinical Infection and Immunity

 

Cardiology Research

World Journal of Nephrology and Urology

Cellular and Molecular Medicine Research

 

Journal of Neurology Research

International Journal of Clinical Pediatrics

 

 
       
 

Journal of Endocrinology and Metabolism, bimonthly, ISSN 1923-2861 (print), 1923-287X (online), published by Elmer Press Inc.                     
The content of this site is intended for health care professionals.
This is an open-access journal distributed under the terms of the Creative Commons Attribution-NonCommercial 4.0 International License, which permits unrestricted
non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Creative Commons Attribution license (Attribution-NonCommercial 4.0 International CC-BY-NC 4.0)


This journal follows the International Committee of Medical Journal Editors (ICMJE) recommendations for manuscripts submitted to biomedical journals,
the Committee on Publication Ethics (COPE) guidelines, and the Principles of Transparency and Best Practice in Scholarly Publishing.

website: www.jofem.org   editorial contact: editor@jofem.org    elmer.editorial2@hotmail.com
Address: 9225 Leslie Street, Suite 201, Richmond Hill, Ontario, L4B 3H6, Canada

© Elmer Press Inc. All Rights Reserved.


Disclaimer: The views and opinions expressed in the published articles are those of the authors and do not necessarily reflect the views or opinions of the editors and Elmer Press Inc. This website is provided for medical research and informational purposes only and does not constitute any medical advice or professional services. The information provided in this journal should not be used for diagnosis and treatment, those seeking medical advice should always consult with a licensed physician.