As a result of improved cardiorespiratory fitness, what will decrease over time?

The correct answer is resting heart rate. As a person engages in regular aerobic exercise and improves their cardiorespiratory fitness, their heart becomes more efficient at pumping blood. This adaptation means that the heart can deliver the same amount of oxygen to the muscles with fewer beats. Consequently, the number of beats per minute when the individual is at rest decreases, leading to a lower resting heart rate.

Over time, as cardiorespiratory fitness improves, the cardiovascular system becomes more efficient not only in exercising situations but also at rest. A lower resting heart rate is often an indicator of a well-conditioned heart and a healthy level of overall fitness.

Maximum heart rate does not typically decrease with improved cardiorespiratory fitness; rather, it remains relatively constant throughout adulthood. Blood pressure may also improve with increased fitness levels, often leading to lower blood pressure readings for individuals engaged in regular exercise. Body temperature is generally not affected in such a way that it would be characterized by a decrease due to improved cardiorespiratory fitness, as body temperature regulation is a complex process influenced by several factors, not solely by fitness.