How does a hot bath effect heart rate?

When you take a hot bath, your heart rate increases as your body works to cool itself down. The increased blood flow helps to distribute heat throughout your body and bring it closer to the skin's surface, where it can be released into the air. Additionally, the warm water causes your blood vessels to dilate, which further increases blood flow. This increased blood flow can lead to a temporary increase in heart rate as your body works harder to pump the extra blood.