title: Long-term vasotonus behavior of the microvasculatory system of heart and skeletal muscle in rats exercised by swimming.
abstract: A new histomorphometric method was used to study the hitherto unknown long-term vasotonus behavior of the arterial microvasculatory system. The right and the left ventricular walls of 29 rats exercised by swimming (48 hours in 4 weeks), and 30 control animals, as well as the musculus rectus femoris of 5 experimental and 5 control animals were investigated. The walls of arterial microvessels of the right ventricular wall and of the skeletal muscle of trained rats were significantly thicker indicating a long-term vasotonus increase. In the microvasculature of the lift ventricular wall no differences were found in comparison to control animals. In view of the vasotonus increase in the right ventricular wall and skeletal muscle, one can assume that tonus-decreasing factors of nearly the same intensity and/or duration of efficiency have opposed the tonic influences in the left-ventricular microvessels, thus preventing a thickening of vessel walls.
mesh_terms: D000251:Adenosine Triphosphatases / Q000378:metabolism; D000818:Animals; D003331:Coronary Vessels / Q000033:anatomy & histology*; D006352:Heart Ventricles / Q000201:enzymology; D006651:Histocytochemistry; D008297:Male; D008833:Microcirculation / Q000033:anatomy & histology; D009132:Muscles / Q000098:blood supply*; D005082:Physical Exertion; D051381:Rats; D011919:Rats, Inbred Strains
chemical_list: D000251:Adenosine Triphosphatases