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Hopping in hypogravity-A rationale for a plyometric exercise countermeasure in planetary exploration missions

Weber, T. and Green, D.A. and Attias, J. and Sies, W. and Frechette, A. and Braunstein, B. and Rittweger, J. (2019) Hopping in hypogravity-A rationale for a plyometric exercise countermeasure in planetary exploration missions. PLoS One, 14 (2), e0211263. Public Library of Science (PLoS). DOI: 10.1371/journal.pone.0211263 ISSN 1932-6203

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Official URL: https://www.ncbi.nlm.nih.gov/pubmed/30759113

Abstract

Moon and Mars are considered to be future targets for human space explorations. The gravity level on the Moon and Mars amount to 16% and 38%, respectively, of Earth's gravity. Mechanical loading during the anticipated habitual activities in these hypogravity environments will most likely not be sufficient to maintain physiological integrity of astronauts unless additional exercise countermeasures are performed. Current microgravity exercise countermeasures appear to attenuate but not prevent 'space deconditioning'. However, plyometric exercises (hopping and whole body vibration) have shown promise in recent analogue bed rest studies and may be options for space exploration missions where resources will be limited compared to the ISS. This paper therefore tests the hypothesis that plyometric hop exercise in hypogravity can generate sufficient mechanical stimuli to prevent musculoskeletal deconditioning. It has been suggested that hypogravity-induced reductions in peak ground reaction force (peak vertical GRF) can be offset by increases in hopping height. Therefore, this study investigated the effects of simulated hypogravity (0.16G, 0.27G, 0.38G, and 0.7G) upon sub-maximal plyometric hopping on the Verticalised Treadmill Facility, simulating different hypogravity levels. Results show that peak vertical GRF are negatively related to simulated gravity level, but positively to hopping height. Contact times decreased with increasing gravity level but were not influenced through hopping height. In contrast, flight time increased with decreasing gravity levels and increasing hopping height (P < 0.001). The present data suggest that the anticipated hypogravity-related reductions of musculoskeletal forces during normal walking can be compensated by performing hops and therefore support the idea of plyometric hopping as a robust and resourceful exercise countermeasure in hypogravity. As maximal hop height was constrained on the VTF further research is needed to determine whether similar relationships are evident during maximal hops and other forms of jumping.

Item URL in elib:https://elib.dlr.de/133765/
Document Type:Article
Title:Hopping in hypogravity-A rationale for a plyometric exercise countermeasure in planetary exploration missions
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Weber, T.UNSPECIFIEDUNSPECIFIED
Green, D.A.Centre of Human & Aerospace Physiological Sciences, King's College London, London, UK.UNSPECIFIED
Attias, J.UNSPECIFIEDUNSPECIFIED
Sies, W.UNSPECIFIEDUNSPECIFIED
Frechette, A.UNSPECIFIEDUNSPECIFIED
Braunstein, B.UNSPECIFIEDUNSPECIFIED
Rittweger, J.Joern.Rittweger (at) dlr.dehttps://orcid.org/0000-0002-2223-8963
Date:13 February 2019
Journal or Publication Title:PLoS One
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:14
DOI :10.1371/journal.pone.0211263
Page Range:e0211263
Publisher:Public Library of Science (PLoS)
ISSN:1932-6203
Status:Published
Keywords:mechanical stimuli; musculoskeletal deconditioning; plyometric exercise
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 - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Systemphysiologie
Location: Köln-Porz
Institutes and Institutions:Institute of Aerospace Medicine > Muscle and Bone Metabolism
Deposited By: Becker, Christine
Deposited On:22 Jan 2020 09:34
Last Modified:30 Sep 2020 19:05

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