During a warm-up, which variable will *not* remain in a steady state?

During a warm-up, heart rate is the variable that typically does not remain in a steady state. As exercise intensity increases during the warm-up, heart rate responds by rising quickly to meet the increased demand for oxygen and nutrient delivery to the working muscles. This rise is dynamic and occurs in response to the demands placed on the body as it transitions from rest to activity.

In contrast, diastolic blood pressure generally remains stable during moderate exercise sessions or warm-ups. Breathing or respiratory rate increases but will also reach a new steady state as the exercise continues, allowing for efficient gas exchange. Overall body temperature gradually increases in a steady manner during warm-up to properly prepare the muscles and physiological systems for more intense exercise.