Clonidine can be helpful in patients with excessive sympathetic activity.

It is especially effective in increasing both parasympathetic and sympathetic activity.

They expressed fear that they may be subject to retaliation for any activities here sympathetic to the demonstrators.

The authors suggested that the pain relief was caused by a normalisation of up-regulated sympathetic activity.

Intubation causes increased sympathetic activity, an increase in intracranial pressure and bronchospasm.

Horner syndrome is due to a deficiency of sympathetic activity.

Increased heart rate, stimulated by increased sympathetic activity in order to maintain cardiac output.

This center in the brain increases sympathetic activity, releasing catecholamines into the blood stream.

However, many instances of sympathetic and parasympathetic activity cannot be ascribed to "fight" or "rest" situations.

Especially after a heart attack, sympathetic nervous activity tends to be increased.