What physiological change occurs in the cardiorespiratory system due to immobilization?

Immobilization leads to several negative adaptations in the cardiorespiratory system, one of which is a decrease in maximum oxygen uptake, also known as VO2 max. VO2 max represents the greatest amount of oxygen the body can utilize during intense exercise and is a key indicator of cardiovascular fitness and aerobic endurance.

When a person is immobilized, several physiological changes occur, including a reduction in blood volume and an overall decrease in the efficiency of the heart and lungs. These changes contribute to a diminished ability to deliver and utilize oxygen during physical activity, leading to a lower VO2 max.

This decline in maximum oxygen uptake is particularly significant in individuals who are immobilized for extended periods, such as after surgery or due to injury, which can result in detraining effects. It is crucial for athletes and those involved in rehabilitative exercise programs to understand this effect, as it underscores the importance of regular physical activity to maintain cardiorespiratory fitness and function.

The other options do not describe changes that are typically associated with immobilization. For instance, stroke volume generally decreases due to reduced heart chamber size and decreased return of blood to the heart during immobilization. Likewise, resting heart rate tends to increase rather than decrease, reflecting changes in autonomic