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Extensibility of the cardiac muscle during adaptation to physical loads


Byulleten' Eksperimental'noi Biologii i Meditsiny 82(9): 1032-1034
Extensibility of the cardiac muscle during adaptation to physical loads
Strips of the papillary muscle of rat left ventricle were extended by means of increasing loads. The curve of the strip elongation depending on the load value characterized the myocardial distensibility. Seven to 11 wk from the beginning of regular swimming exercises (for 30-60 min) the distensibility curve showed a significant increase of the myocardial distensibility, and the maximal contraction amplitude was reached with a lesser force. An increased distension of the cardiac muscle of the adapted animals can serve as 1 component of dilatation of the trained heart and a more rapid mobilization of the contractile function during exercises.


Accession: 005432772



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