Which type of exercise keeps heart rate in a plateau effect?

Sub-maximal exercise is characterized by an intensity level that is below the maximum capacity of an individual. During this type of exercise, the body enters a steady state where the cardiovascular system is able to supply sufficient oxygen to meet the energy demands of the activity. This results in a plateau effect in heart rate, where it stabilizes rather than fluctuating widely. The steady workload allows for the heart rate to increase to a moderate level and maintain that level without excessive strain or quick shifts, creating a stable rhythm that aligns with the overall energy output of the exercise.

In contrast, maximal exercise involves pushing the body to its limits, leading to dramatic fluctuations in heart rate as the body struggles to meet its oxygen demands. Aerobic exercise can involve varying intensities, and while it might lead to a plateau during steady-state activities, it can also involve periods of higher intensity where heart rate fluctuates. High-intensity interval training emphasizes alternating between short bursts of maximum effort followed by periods of rest or low activity, which inherently causes the heart rate to respond rapidly rather than maintaining a steady plateau.