Final answer:
Active cool-down, static stretching, and deep breathing exercises are all valid methods for cardiorespiratory recovery. They help reduce heart rate, alleviate muscle stiffness, and promote removal of excess carbon dioxide, respectively. Aerobic exercise, which includes activities like cycling and swimming, requires sustained oxygen use and can lead to increased body heat dissipated through sweating and respiration.
Step-by-step explanation:
The student's question pertains to methods that can assist in cardiorespiratory recovery after exercise. The options listed, such as active cool-down, static stretching, and deep breathing exercises, are all effective methods. An active cool-down helps by slowly reducing the heart rate and can involve light activities that maintain the blood flow to clear lactic acid buildup. Static stretching can reduce muscle stiffness and improve flexibility, while deep breathing exercises can help in reducing the breathing rate and calming the nervous system, which aids recovery by promoting the removal of carbon dioxide from the blood. In terms of physiological responses during the recovery period: active cool-down helps avoid the constriction of blood vessels in the skin; deep breathing prevents the breathing from becoming too slow and shallow; and the body's sweat glands will actually decrease their output as the body cools down, not increase. Aerobic exercise has been defined as physical activity that uses a high percentage of slow-twitch muscle fibers and consumes a substantial amount of oxygen, aiming to increase cardiovascular endurance. It's worth noting that during aerobic exercise, the body can become inefficient, leading to the production of excess heat which is then dissipated through mechanisms like sweating and increased respiration.