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Bed Rest and Intermittent Centrifugation Effects on Human Balance and Neuromotor Reflexes.

Identifieur interne : 000494 ( Main/Curation ); précédent : 000493; suivant : 000495

Bed Rest and Intermittent Centrifugation Effects on Human Balance and Neuromotor Reflexes.

Auteurs : William H. Paloski ; Millard F. Reschke ; Alan H. Feiveson

Source :

RBID : pubmed:28818139

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English descriptors

Abstract

INTRODUCTION

The effects of repeated centrifugation in association with head-down tilt (HDT) bed rest (BR) on the mediation of basic reflexes associated with the major postural muscles was investigated as a potential countermeasure for maintaining balance control and neuromotor reflex function.

METHODS

There were 15 male volunteers who were exposed to 21 d of 6° HDT-BR. Eight were treated with daily 1-h artificial gravity (AG) exposures aboard a short radius centrifuge that provided 1-g footward loading at heart level. The other seven served as HDT-BR control subjects. Balance control was assessed using a standard computerized dynamic posturography (CDP) protocol that was modified by adding low-frequency pitch-plane head movements. Neuromotor reflex function was assessed using tendon stretch reflexes (MSR) and functional stretch reflex (FSR) data collected from the triceps surae muscle group.

RESULTS

CDP performance was degraded by HDT-BR in both groups (ranging from 24 to 26%), but was unaffected by AG. BR also degraded MSR and FSR functions in both groups, with increased peak reflex latencies between 1.5 and 1.95 ms, but AG maintained pre-BR latencies for the MSR subjects.

DISCUSSION

AG exposure did not modify balance control from pre-BR responses, but did help prevent decrements in FSR latencies post-BR.Paloski WH, Reschke MF, Feiveson AH. Bed rest and intermittent centrifugation effects on human balance and neuromotor reflexes. Aerosp Med Hum Perform. 2017; 88(9):812-818.


DOI: 10.3357/AMHP.4819.2017
PubMed: 28818139

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pubmed:28818139

Le document en format XML

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<term>Gravity, Altered (MeSH)</term>
<term>Head-Down Tilt (physiology)</term>
<term>Healthy Volunteers (MeSH)</term>
<term>Humans (MeSH)</term>
<term>Male (MeSH)</term>
<term>Orthostatic Intolerance (physiopathology)</term>
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<term>Adulte (MeSH)</term>
<term>Alitement (MeSH)</term>
<term>Humains (MeSH)</term>
<term>Intolérance orthostatique (physiopathologie)</term>
<term>Mâle (MeSH)</term>
<term>Pesanteur modifiée (MeSH)</term>
<term>Position déclive (physiologie)</term>
<term>Réflexe d'étirement (physiologie)</term>
<term>Volontaires sains (MeSH)</term>
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<term>Intolérance orthostatique</term>
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<term>Orthostatic Intolerance</term>
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<keywords scheme="MESH" xml:lang="en">
<term>Adaptation, Physiological</term>
<term>Adult</term>
<term>Bed Rest</term>
<term>Gravity, Altered</term>
<term>Healthy Volunteers</term>
<term>Humans</term>
<term>Male</term>
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<term>Adaptation physiologique</term>
<term>Adulte</term>
<term>Alitement</term>
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<b>INTRODUCTION</b>
</p>
<p>The effects of repeated centrifugation in association with head-down tilt (HDT) bed rest (BR) on the mediation of basic reflexes associated with the major postural muscles was investigated as a potential countermeasure for maintaining balance control and neuromotor reflex function.</p>
</div>
<div type="abstract" xml:lang="en">
<p>
<b>METHODS</b>
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<p>There were 15 male volunteers who were exposed to 21 d of 6° HDT-BR. Eight were treated with daily 1-h artificial gravity (AG) exposures aboard a short radius centrifuge that provided 1-g footward loading at heart level. The other seven served as HDT-BR control subjects. Balance control was assessed using a standard computerized dynamic posturography (CDP) protocol that was modified by adding low-frequency pitch-plane head movements. Neuromotor reflex function was assessed using tendon stretch reflexes (MSR) and functional stretch reflex (FSR) data collected from the triceps surae muscle group.</p>
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<p>
<b>RESULTS</b>
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<p>CDP performance was degraded by HDT-BR in both groups (ranging from 24 to 26%), but was unaffected by AG. BR also degraded MSR and FSR functions in both groups, with increased peak reflex latencies between 1.5 and 1.95 ms, but AG maintained pre-BR latencies for the MSR subjects.</p>
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<div type="abstract" xml:lang="en">
<p>
<b>DISCUSSION</b>
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<p>AG exposure did not modify balance control from pre-BR responses, but did help prevent decrements in FSR latencies post-BR.Paloski WH, Reschke MF, Feiveson AH. Bed rest and intermittent centrifugation effects on human balance and neuromotor reflexes. Aerosp Med Hum Perform. 2017; 88(9):812-818.</p>
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