Question

How does blood pressure change during cold temperatures?

Does it cause changes to pulse?

Answer 1

The blood pressure increases during cold temperature because the blood vessels becomes narrow to conserve body heat and prevents the heat loss, so that the body can maintain the internal temperature or homeostasis. Due to the constriction of blood vessels the pressure inside the vessels increases as the blood has to flow through the narrow passage and thus heart has to work hard or to pump hard to flow the blood through the narrow vessels. So as a result the blood pressure and the heart rate increases than normal during cold temperature.

The pulse rate increases in cold temperature because due to cold temperature the heart has to pump harder and the  contractions of the heart cause the increases in blood pressure in the arteries that results in a noticeable pulse. So increase in the heart rate is the direct measure of pulse rate.