Final answer:
A pulse rate under 60 bpm in adults is termed bradycardia, which is an abnormal heart rate that may require treatment if symptomatic.
Step-by-step explanation:
When your pulse rate is under 60 beats per minute (bpm) it is called bradycardia. In an adult, a normal resting heart rate (HR) is typically in the range of 60-100 bpm. Bradycardia is considered an abnormal heart rate, but in some cases, such as in trained athletes, it may not be clinically significant unless accompanied by symptoms like weakness, fatigue, dizziness, or chest discomfort. Treatment of bradycardia depends on determining the underlying cause, which could be related to the heart itself or external factors such as metabolic disorders or medications.