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Respective effects of hindlimb suspension, confinement and spaceflight on myotendinous junction ultrastructure |
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| Authors: | Zamora A J Carnino A Roffino S Marini J F |
| Institution: | * I.C.N.E. CNRS UMR 9941, Faculté de Médecine Nord, Bd Dramard 13916, Marseille Cedex 20, France ** CNRS UPR 9041, 280 Bd sainte Marguerite, 13009, Marseille, France † Université de la Méditérannée, Faculté des sciences du sport, 163, Avenue de Luminy, Case Postale 910 13288, Marseille Cedex 9, France |
| Abstract: | This study compares the effects of 14-day confinement and spaceflight with the respective effects of 8, 18 and 29-day hindlimb suspension on rat soleus and plantaris MTJ ultrastructure. Independently of the experimental situation, greater morphological changes were observed in the soleus as compared to the plantaris MTJ. 18 days of suspension and 14 days of confinement resulted in ultrastructural modifications of the digit-like processes in the soleus MTJ. Additional changes were observed in the myofibrils, microtendon and tendon after 29 days of suspension and 4 days of spaceflight. These results emphasize the influence of the intensity and duration of the muscle loading on the MTJ ultrastructure. |
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