In his book, Mind and Tissue, Peat describes a boy's symptoms following an attack of malaria to illustrate "the connection between pace and space":
Objects began to seem much smaller in size. The patient's perception of speed was no longer correct: Everything seemed to him to be taking place faster (people, for example, did not walk, but ran). For this reason he too began to do everything very quickly. After treatment with quinine, these aberrations disappeared. (Pages 173-174, Space and Time Perception by the Cosmonaut, Leonov and Lebedev.)
In the anxious sympathetic state, nerve threshold would be lowered, and reflexes would be triggered more easily: This would increase the pace of activity, but since the energy charge wouldn't return to the highest level, the action would be smaller. This would presumably apply not only to heart-beat and respiration, but to other reflex actions such as orgasm.
The thyroid hormone keeps the cellular energy high, the adrenaline low, and reflexes strong. It undoubtedly has an important effect on both perception and responses.