Final answer:
The typical resting heart rate of a human ranges from 60-100 beats per minute, with variations due to factors like age, fitness level, and exercise. Bradycardia occurs below 60 bpm and tachycardia above 100 bpm, with symptoms necessitating medical attention. Maximum heart rates decrease with age.
Step-by-step explanation:
The typical resting heart rate (HR) for a human being is normally within the range of 60-100 beats per minute (bpm). Conditions such as bradycardia occur when the HR drops below 60 bpm, while tachycardia is when the HR exceeds 100 bpm.
Trained athletes might have lower resting heart rates, sometimes even in the range of 30-40 bpm. It is important to note that HRs vary with exercise, fitness levels, and age; e.g., newborns may have resting HRs around 120 bpm.
In general, most people will not experience any symptoms if their HR stays above 50 bpm, but potential symptoms of abnormal HR include weakness, fatigue, dizziness, and chest discomfort.
A resting heart rate below 60 bpm might not always indicate a medical issue unless accompanied by such symptoms, while a heart rate above 100 bpm may suggest tachycardia, which could require medical attention if persistent.
It's also worth noting that maximum HRs typically range from 200-220 bpm and decrease with age; for example, a 40-year-old's maximum heart rate would be around 180 bpm.