What medical condition is characterized by a slow heart rate of 60 beats per minute or less?

Bradycardia is defined as a slower than normal heart rate, specifically one that is less than 60 beats per minute. This condition can indicate various underlying health issues, ranging from heart problems to the effects of certain medications. In some cases, bradycardia may be a normal finding, particularly in well-trained athletes, where a lower heart rate reflects a more efficient cardiovascular system. However, when it occurs in other individuals, it can lead to symptoms such as fatigue, dizziness, or fainting, requiring medical evaluation to determine the cause and appropriate treatment.

Hypertension refers to high blood pressure, which is a different cardiovascular condition. Tachycardia involves an elevated heart rate, typically defined as being above 100 beats per minute, and is characterized by rapid heartbeats, which can lead to different implications for health. Arrhythmia describes any irregularity in heart rhythm, which can include bradycardia but encompasses a broader range of heart rhythm issues. Thus, bradycardia is the specific condition that matches the description provided.