What is the normal heart rate for adults?

The normal heart rate for adults is defined as being between 60 and 100 beats per minute (bpm). This range is established based on a healthy adult's resting heart rate, which can be influenced by various factors such as fitness level, age, and individual health conditions.

Heart rates below 60 bpm may indicate bradycardia, a condition that could be normal for well-trained athletes but might suggest a health issue in others. Conversely, a heart rate above 100 bpm is considered tachycardia, which can be a sign of stress, anxiety, hormone levels, or medical conditions that require further investigation. Therefore, the range of 60-100 bpm is widely accepted as the standard for assessing adult resting heart rates.

The other ranges provided are not aligned with established medical guidelines for normal adult heart rates, indicating that those values are either too low or too high for a typical adult's resting state.