Which preposition to use with arousal

of Occurrences 2%

One, the adrenal gland, has been the object of special study and has been shown, upon the arousal of these reserves of energy, to produce a secretion of the utmost importance in providing for sudden emergencies.

between Occurrences 1%

Moreover, if the union of the two principalities was to be accomplished under a native prince, it is obvious that the competition would have become doubly keen; not to speak of the jealousies likely to be arousal between Moldavians and Muntenians.

Which preposition to use with  arousal