Hanafy M, Kitzing J, Rumberger E. The influence of calcium and beta-sympathomimetics on force-frequency relationship and resting potentiation in guinea pig papillary muscle.
Basic Res Cardiol 1976;
71:469-81. [PMID:
1016186 DOI:
10.1007/bf01909763]
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Abstract
The influence of various calcium concentrations and of the beta-sympathomimeticum orciprenaline (Alupent) on the force-frequency relationship and on the resting potentiation of isolated isometrically contracting papillary muscles of the guinea pig heart was studied. Elevation of Ca concentration and/or addition of orciprenaline augment the amplitudes of contractions elicited by rhythmical stimulation, but they diminish the amplitudes of test contractions elicited after a test interval of 1-2 s. It is suggested that calcium and orciprenaline strengthen the calcium loss from the sarcoplasmic reticulum out of the cell during a prolonged interval.
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