Final answer:
For an adult, a resting heart rate below 60 beats per minute indicates bradycardia. Symptoms of bradycardia may include weakness, fatigue, dizziness, fainting, chest discomfort, palpitations, or respiratory distress.
Step-by-step explanation:
For an adult, a resting heart rate below 60 beats per minute indicates bradycardia. Bradycardia is a condition where the heart beats too slowly. Trained athletes may have lower heart rates, but for most individuals, rates lower than 50 beats per minute would indicate bradycardia. Symptoms of bradycardia may include weakness, fatigue, dizziness, fainting, chest discomfort, palpitations, or respiratory distress. If any of these symptoms are present, it may indicate that the heart is not providing sufficient oxygenated blood to the tissues.