What occurs in physiologically when athlete is suddenly forced to stop physical activity?

Cardiovascular system:

- Heart rate and stroke volume decrease, leading to a drop in cardiac output.

- Blood pressure decreases.

- Peripheral resistance increases, causing blood to pool in the extremities and reducing blood flow to the heart and vital organs.

Respiratory system:

- Breathing rate and tidal volume decrease, leading to a reduction in minute ventilation.

- Alveolar ventilation decreases, causing an increase in the partial pressure of carbon dioxide (PaCO2) and a decrease in the partial pressure of oxygen (PaO2) in the blood.

Musculoskeletal system:

- Muscles relax and blood flow to the muscles decreases, leading to a decrease in muscle strength and power.

- Muscle glycogen and ATP stores are depleted, and lactic acid accumulates, causing muscle fatigue and soreness.

Metabolism:

- The body switches from aerobic metabolism to anaerobic metabolism, leading to an increase in the production of lactic acid.

- Lactic acid accumulates in the blood, causing a decrease in blood pH (acidosis).

Neurological system:

- The brain receives less blood flow and oxygen, leading to a decrease in cognitive function, dizziness, and fatigue.

Thermoregulation:

- Body temperature may increase due to the reduced blood flow to the skin and the increase in metabolic heat production.