A resting heart rate above 100 bpm may indicate which condition?

A resting heart rate above 100 beats per minute is typically classified as tachycardia and can serve as an important indicator of various physiological conditions. Overtraining is a common scenario in which athletes or individuals engage in excessive training without adequate recovery. This condition puts a strain on the body, elevating sympathetic nervous system activity and leading to increased heart rates even at rest.

In athletes, a consistently high resting heart rate may suggest that the body is under stress and not recovering properly, which can lead to decreased performance and potential health issues. Therefore, monitoring resting heart rates can be crucial for identifying overtraining syndrome early, allowing for necessary adjustments in training regimens.

While dehydration can also lead to increased heart rates, it is often accompanied by other symptoms like thirst, weakness, and dizziness. Excess hydration is typically not associated with elevated resting heart rates, as it usually supports cardiovascular function. Improved fitness, on the other hand, is generally characterized by lower resting heart rates due to better heart efficiency. Hence, the connection between a resting heart rate above 100 bpm and overtraining is particularly strong, confirming it as the correct answer in this context.