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Titolo:
Effect of long-duration spaceflight on postural control during self-generated perturbations
Autore:
Layne, CS; Mulavara, AP; McDonald, PV; Pruett, CJ; Kozlovskaya, IB; Bloomberg, JJ;
Indirizzi:
Univ Houston, Dept Hlth & Human Performance, Houston, TX 77204 USA Univ Houston Houston TX USA 77204 uman Performance, Houston, TX 77204 USA NASA, Lyndon B Johnson Space Ctr, Life Sci Res Labs, Houston, TX 77058 USANASA Houston TX USA 77058 e Ctr, Life Sci Res Labs, Houston, TX 77058 USA Inst Biomed Problems, Moscow 123007, Russia Inst Biomed Problems Moscow Russia 123007 roblems, Moscow 123007, Russia Tecmath, Troy, MI 48098 USA Tecmath Troy MI USA 48098Tecmath, Troy, MI 48098 USA
Titolo Testata:
JOURNAL OF APPLIED PHYSIOLOGY
fascicolo: 3, volume: 90, anno: 2001,
pagine: 997 - 1006
SICI:
8750-7587(200103)90:3<997:EOLSOP>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
SPACE-FLIGHT; TREADMILL WALKING; LOWER-LIMB; ADJUSTMENTS; BALANCE; MOVEMENT; SWAY; MICROGRAVITY; KINEMATICS; GAIT;
Keywords:
neuromuscular activation; electromyogram; proprioception;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Layne, CS Univ Houston, Dept Hlth & Human Performance, 104 Garrison, Houston, TX 77204 USA Univ Houston 104 Garrison Houston TX USA 77204 ton, TX 77204 USA
Citazione:
C.S. Layne et al., "Effect of long-duration spaceflight on postural control during self-generated perturbations", J APP PHYSL, 90(3), 2001, pp. 997-1006

Abstract

This report is the first systematic evaluation of the effects of prolongedweightlessness on the bipedal postural control processes during self-generated perturbations produced by voluntary upper limb movements. Spaceflight impacts humans in a variety of ways, one of which is compromised postflightpostural control. We examined the neuromuscular activation characteristicsand center of pressure (COP) motion associated with arm movement of eight subjects who experienced long-duration spaceflight (3-6 mo) aboard the Mir space station. Surface electromyography, arm acceleration, and COP motion were collected while astronauts performed rapid unilateral shoulder flexionsbefore and after spaceflight. Subjects generally displayed compromised postural control after flight, as evidenced by modified COP peak-to-peak anterior-posterior and mediolateral excursion, and pathlength relative to preflight values. These changes were associated with disrupted neuromuscular activation characteristics, particularly after the completion of arm acceleration (i.e., when subjects were attempting to maintain upright posture in response to self-generated perturbations). These findings suggest that, although the subjects were able to assemble coordination modes that enabled them to generate rapid arm movements, the subtle control necessary to maintain bipedal equilibrium evident in their preflight performance is compromised after long-duration spaceflight.

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Documento generato il 01/04/20 alle ore 10:21:53