Rasarnavasudhakara 1.559

1.559

atha vepathuḥ-
vepathur harṣa-santrāsa-jarā-krodhādibhir bhavet |
tatrānubhāvāḥ sphuraṇa-gātra-kampādayo matāḥ ||

Now, trembling: / Trembling may arise from joy, terror, old age, anger, and the like; / there, its consequents are considered to be twitching, shaking of the limbs, and so forth.