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Titolo:
Effects of long-term spaceflight on mechanical properties of muscles in humans
Autore:
Lambertz, D; Perot, C; Kaspranski, R; Goubel, F;
Indirizzi:
Univ Technol Compiegne, CNRS, Dept Genie Biol, UMR 6600, F-60205 Compiegne, France Univ Technol Compiegne Compiegne France F-60205 -60205 Compiegne, France YA Gagarin Cosmonauts Training Ctr, Star City 141160, Moscow Region, Russia YA Gagarin Cosmonauts Training Ctr Star City Moscow Region Russia 141160
Titolo Testata:
JOURNAL OF APPLIED PHYSIOLOGY
fascicolo: 1, volume: 90, anno: 2001,
pagine: 179 - 188
SICI:
8750-7587(200101)90:1<179:EOLSOM>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
RAT SOLEUS MUSCLE; FIBER-TYPE TRANSITION; TRICEPS SURAE MUSCLE; HINDLIMB SUSPENSION; CONTRACTILE PROPERTIES; ELASTIC PROPERTIES; PLANTAR FLEXION; MOTOR UNITS; IN-VIVO; STIFFNESS;
Keywords:
isometric force; isokinetic contraction; musculotendinous stiffness; musculoarticular stiffness;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
45
Recensione:
Indirizzi per estratti:
Indirizzo: Goubel, F Univ Technol Compiegne, CNRS, Dept Genie Biol, UMR 6600, F-60205Compiegne, France Univ Technol Compiegne Compiegne France F-60205 piegne, France
Citazione:
D. Lambertz et al., "Effects of long-term spaceflight on mechanical properties of muscles in humans", J APP PHYSL, 90(1), 2001, pp. 179-188

Abstract

The effects of long-term spaceflight (90-180 days) on the contractile and elastic characteristics of the human plantarflexor muscles were studied in 14 cosmonauts before and 2-3 days after landing. Despite countermeasures practiced aboard, spaceflight was found to induce a decrease in maximal isometric torque (17%), whereas an index of maximal shortening velocity was found to increase (31%). In addition, maximal muscle activation evaluated during isokinetic tests decreased by 39%. Changes in musculotendinous stiffness and whole joint stiffness were characterized by,means of quick-release movements and sinusoidal perturbations. Musculotendinous stiffness was found tobe increased by 25%. Whole joint stiffness decreased under passive conditions (21%), whereas whole joint stiffness under active conditions remained unchanged after spaceflight (-1%). This invariance suggests an adaptive mechanism to counterbalance the decrease in stiffness of passive structures by an increased active stiffness. Changes in neural drive could participate inthis equilibrium.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/09/20 alle ore 22:01:35