What is the role of potassium during aerobic exercise and anaerobic exercise?

Balance: Potassium and sodium are important in all cells in the body and are lost in sweat - affecting both aerobic and anaerobic exercise.

Acid-base balance: One of the roles of potassium is to help maintain the acid-base balance in the blood. During anaerobic exercise you create an 'oxygen debt' that increases Lactic Acid levels. Potassium ions move out of the cells while hydrogen ions (acid) move into them to help keep the ph of the blood from dropping. This movement is reversed during aerobic recovery.

Cell survival 24/7: Potassium concentration in water outside cells low: e.g. 4.5 mmol/l, high inside cells vs. 150 mmol/l. Sodium the opposite: high outside cells: e.g. 140 mmol/l vs. Low inside cells 5 mmol/l. Why? Because all cells pump potassium in ; sodium out continuously. This allows action potentials, nerve conduction, muscle cell activation, etc. Etc. Do your research, 400 bytes to little for thorough answer.