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Changes in the capillarity of skeletal muscle in the growing rat. 1979

E Ripoll, and A H Sillau, and N Banchero

Capillary density (CD), capillary to fiber ratio (C/F), fiber cross sectional area (FCSA) and fiber composition were measured in the soleus and the gastrocnemius (medial head) muscles of rats weighing between 99 and 666 g. Muscle samples obtained from the anesthetized animal were rapidly frozen (-130 degrees C) sliced transversely at 16--18 micrometers, and treated histochemically by the ATPase method after preincubation at pH's of 4.0 and 4.4 to visualize capillaries and typify fibers. In both muscles the FCSA was positively related to body weight (BW) and muscle weight. At a given BW, the FCSA of the soleus was greater than that of the gastrocnemius. In both muscles CD decreased hyperbolically with FCSA (soleus: CD = 1.0613 X 10(6)/FCSA + 298.71; gastrocnemium: CD = 1.0349 X 10(6)/FCSA + 240.74). At the same time a positive linear correlation between C/F and FCSA was found (soleus: C/F = 3.92 X 10(-4) FCSA + 0.82; gastrocnemius: C/F = 2.90 X 10(-4) FCSA + 0.93). At a given FCSA, CD and C/F were greater in the soleus than in the gastrocnemius because of differences in fiber composition between the two muscles. The soleus had only oxidative fibers (STO and FTOG) whereas the gastrocnemius had 54% glycolytic fibers (FTG). The very large variability in CD and C/F values reported in the literature could, in part, be due to the differences in capillarity observed with maturation. A change in fiber composition with BW was observed in the soleus, but no systematic change occurred in the gastrocnemius.

UI MeSH Term Description Entries
D009132 Muscles Contractile tissue that produces movement in animals. Muscle Tissue,Muscle,Muscle Tissues,Tissue, Muscle,Tissues, Muscle
D009246 NADH Tetrazolium Reductase Catalyzes the reduction of tetrazolium compounds in the presence of NADH. NAD(P)H Nitroblue Tetrazolium Reductase,NADH2 Tetrazolium Reductase,Reductase, NADH Tetrazolium,Reductase, NADH2 Tetrazolium,Tetrazolium Reductase, NADH,Tetrazolium Reductase, NADH2
D009929 Organ Size The measurement of an organ in volume, mass, or heaviness. Organ Volume,Organ Weight,Size, Organ,Weight, Organ
D001835 Body Weight The mass or quantity of heaviness of an individual. It is expressed by units of pounds or kilograms. Body Weights,Weight, Body,Weights, Body
D002196 Capillaries The minute vessels that connect arterioles and venules. Capillary Beds,Sinusoidal Beds,Sinusoids,Bed, Sinusoidal,Beds, Sinusoidal,Capillary,Capillary Bed,Sinusoid,Sinusoidal Bed
D002452 Cell Count The number of CELLS of a specific kind, usually measured per unit volume or area of sample. Cell Density,Cell Number,Cell Counts,Cell Densities,Cell Numbers,Count, Cell,Counts, Cell,Densities, Cell,Density, Cell,Number, Cell,Numbers, Cell
D000251 Adenosine Triphosphatases A group of enzymes which catalyze the hydrolysis of ATP. The hydrolysis reaction is usually coupled with another function such as transporting Ca(2+) across a membrane. These enzymes may be dependent on Ca(2+), Mg(2+), anions, H+, or DNA. ATPases,Adenosinetriphosphatase,ATPase,ATPase, DNA-Dependent,Adenosine Triphosphatase,DNA-Dependent ATPase,DNA-Dependent Adenosinetriphosphatases,ATPase, DNA Dependent,Adenosinetriphosphatases, DNA-Dependent,DNA Dependent ATPase,DNA Dependent Adenosinetriphosphatases,Triphosphatase, Adenosine
D000818 Animals Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA. Animal,Metazoa,Animalia
D051381 Rats The common name for the genus Rattus. Rattus,Rats, Laboratory,Rats, Norway,Rattus norvegicus,Laboratory Rat,Laboratory Rats,Norway Rat,Norway Rats,Rat,Rat, Laboratory,Rat, Norway,norvegicus, Rattus
D024510 Muscle Development Developmental events leading to the formation of adult muscular system, which includes differentiation of the various types of muscle cell precursors, migration of myoblasts, activation of myogenesis and development of muscle anchorage. Myofibrillogenesis,Myogenesis,Muscular Development,Development, Muscle,Development, Muscular

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