What question did this study set out to answer?

To explore how adrenaline and cyclic AMP modulation affects calcium channels in frog skeletal muscle fibers.

December 1, 1987The Journal of PhysiologyOpen Access

Modulation of calcium channels of twitch skeletal muscle fibres of the frog by adrenaline and cyclic adenosine monophosphate.

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Randomized trial investigates how adrenaline and cyclic AMP influence calcium channels in frog muscle, suggesting mechanisms for muscle contraction.

To explore how adrenaline and cyclic AMP modulation affects calcium channels in frog skeletal muscle fibers.
Used intracellular voltage recordings and a voltage-clamp technique in frog muscle fibers.
Measured peak slow calcium current (ICa,s) and maximum rate of rise of calcium spikes under different conditions.
Performed mechanical experiments to assess twitch tension's dependency on calcium and stimulation frequency.
Adrenaline increased the maximum rate of rise of calcium spikes by 85% and peak ICa,s by 51%.
Cyclic AMP increased ICa,s by approximately 24%, maintaining this effect for about 2 hours.
Twitch potentiation was dependent on stimulation frequency and was ineffective in nominally calcium-free solutions.

Arreola et al. (1987) studied this question.

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Randomized trial investigates how adrenaline and cyclic AMP influence calcium channels in frog muscle, suggesting mechanisms for muscle contraction.