Atropine-Force of contraction

[Brucelaa67]

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Atropine is a positive chronotropic agent, increases heart rate.
BRS Costanzo says 'Increased heart rate increases the force of contraction in a stepwise fashion as intracellular ca2+ increases cumulatively over several beats'.
So should we expect increase in force of contraction with atropine?
But that doesn't get mentioned no where? Any help please?