How many seconds are in one cardiac cycle?

One cardiac cycle is the time taken for one complete heartbeat, including systole (contraction) and diastole (relaxation) of the heart. The duration of a cardiac cycle can vary from person to person and is influenced by factors such as age, fitness level, and heart rate.

On average, a cardiac cycle lasts about 0.8 seconds. This means that the heart beats approximately 75 times per minute (60 seconds / 0.8 seconds = 75 beats per minute).

However, the duration of a cardiac cycle can be shorter or longer depending on circumstances. For example, during strenuous exercise, the heart rate can increase, resulting in a shorter cardiac cycle. Conversely, during rest or sleep, the heart rate slows down, leading to a longer cardiac cycle.