Twitch and tetanic contraction of lamprey muscle exposed to fatty acid at different temperatures.
The effect of Na-octanoate (NaC8) on the development of twitch and tetanic tension of a striated muscle (m. longitudinalis linguae) of Lampetra fluviatilis was tested at different temperatures. The muscle exhibited posttetanic potentiation as well as cold potentiation similar to other poikilotherme animals. The sensitivity to NaC8 was higher than that of striated frog or rat muscles but similar to that of mammalian smooth or cardiac muscle preparations. A decrease of temperature remarkably reduced the effect of NaC8 on the tension development. Also the fatigue of muscles during tetanic stimulation was smaller if the temperature was lower. It seems that both the process of fatigue and the action of NaC8 are delayed by the cold.
Kössler
F
F
Central Institute of Occupational Medicine of the GDR, Dept. Work Physiology, Berlin.
Nasledov
G A
GA
D000818:Animals; D005227:Fatty Acids / Q000494:pharmacology*; D006863:Hydrogen-Ion Concentration; D066298:In Vitro Techniques; D007798:Lampreys; D009119:Muscle Contraction / Q000187:drug effects; D009132:Muscles / Q000187:drug effects / Q000502:physiology*; D013696:Temperature
D005227:Fatty Acids