Key result
Caffeine at concentrations of 3 to 50 mM potentiated twitch contraction, prolonged action potential duration, and augmented the active slow inward calcium current in bullfrog atrial muscle.
Why the study?
Does caffeine affect membrane potentials, currents, and contractility in bullfrog atrial muscle?
Population
Bullfrog atrial muscle preparations
Comparison
Caffeine (3, 10, and 50 mM) vs Baseline/control conditions
Design
Preclinical
Authors
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No clinical action warranted from frog atrial data; leaves open translation to mammalian physiology.
Does caffeine affect membrane potentials, currents, and contractility in bullfrog atrial muscle?
Caffeine enhances inward calcium current and acts on both the surface membrane and sarcoplasmic reticulum to augment contraction in bullfrog atrial muscle.
KIMOTO et al. (1974) studied None (healthy animal tissue). Caffeine vs. Normal Ringer solution was evaluated on Twitch contraction, action potential duration, and membrane currents. Caffeine at concentrations of 3 to 50 mM potentiated twitch contraction, prolonged action potential duration, and augmented the active slow inward calcium current in bullfrog atrial muscle.
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