What heart rate range is generally considered abnormal?

The heart rate range considered abnormal typically falls outside of the normal physiological limits. The normal resting heart rate for adults usually ranges from 60 to 100 beats per minute (BPM).

The range of 50-140 BPM, while it includes normal physiological responses to activity and stress, also encompasses rates that can be clinically significant. A resting heart rate significantly below 60 BPM might indicate bradycardia, which is often seen as abnormal, especially if it's accompanied by symptoms. Conversely, a heart rate exceeding 100 BPM at rest could indicate tachycardia, which can also be a sign of underlying health issues.

Therefore, this choice is marked as abnormal because a significant portion of it overlaps with both bradycardia and tachycardia, reflecting that heart rates falling outside the normal range can signal a need for medical evaluation or intervention. The other options represent either bradycardia or appropriately elevated heart rates during exercise, making them less likely to be classified as universally abnormal without additional context.