Abstract
1. Increasing the carotid sinus pressure enhances shivering, while decreasing inhibits it.
2. In general, the rising of blood pressure causes an augmentation of shivering as the result of the reflex action from the carotid sinus and aortic arc. Shivering does not set in below the general blood pressure about 70mm Hg.
3. With vagal nerves intact, shivering is inhibited by adrenalin injection, while after cutting vagal nerves the injection of adrenalin accelerates shivering.
4. It may be assumed that both the excitatory and the inhibitory afferent fibers on shivering exist in the vagal nerve.
5. The intensity of shivering changes synchronously with respiration in most cases, seemingly due to the respiratory fluctuation of blood pressure.
