The most common cause of vascular obstruction is a blood clot, also known as a DVT. This type of vascular problem usually occurs in one leg (not both), and leads to swelling of the soft tissues throughout the foot and ankle. The swelling can also extend further up the leg.
The hypothalamus is a part of your brain that controls body temperature. When you exercise, your body temperature increases, causing the hypothalamus to signal the brainstem to further increase your heart rate.
Cardiac output can be increased by increasing the heart rate. Thus an increase in temperature, through the vasodilation of blood vessels causes a drop in blood pressure, which is compensated for by increasing the cardiac output, which can be achieved through increasing the heart rate.eart rates tend to be lower in the morning. Heart rate increases  at high temperatures. Dehydration causes an increase in heart rate.  Heart rate during running varies by a â¦ few beats from day-to-day.  Training heart rate does not predict racing heart rate.