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Am J Physiol Regul Integr Comp Physiol 274: R324-R334, 1998;
0363-6119/98 $5.00
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Vol. 274, Issue 2, R324-R334, February 1998

Space-related bone mineral redistribution and lack of bone mass recovery after reambulation in young rats

Marie-Hélène Lafage-Proust, Philippe Collet, Jean Michel Dubost, Norbert Laroche, Christian Alexandre, and Laurence Vico

Laboratoire de Biologie du Tissu Osseux, Groupement d'Intéret Public Exercice, Faculté de Médecine, 42023 Saint-Etienne, France

This study reports the effects of a 14-day spaceflight followed by a 14-day reambulation period on bones of 56-day-old male rats compared with synchronous (S) and vivarium (V) control animals. Femur, tibia, and humerus bone mineral densities (BMD); bone calcium and phosphorus concentrations ([Ca2+] and [P]), measured by X-ray microanalysis (XRM), on tibia, vertebra, and calvaria; and histomorphometric data on proximal primary and secondary spongiosae (I and II SP, respectively) of the tibia and humerus were measured. After the flight in flown rats (compared with S), BMD was lower in the distal femur and remained similar to S in humerus and tibia, [Ca2+] and [P] were lower in tibia II SP and higher in calvaria, tibia I SP width and II SP bone volume were lower, resorption was markedly higher in tibia II SP, and no difference in formation parameters was observed. After reambulation, BMD was lower in long bones of both flight and S groups compared with V. Bone loss appeared in humeral II SP and worsened in tibial II SP in flown rats. Tibial formation parameters were higher in flown rats compared with V and S, indicating the onset of an active recovery. Tibial XRM [Ca2+] and [P] in flown rats remained below control levels.

X-ray microanalysis; histomorphometry; densitometry; microgravity


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