Changes in the PH of blood

When you are doing cardio exercises, the energy in your body is broken down to lactic acids that are another source of energy in the body. But this source of energy changes to hydrogen ions while you are exercising. These hydrogen ions later lower the PH of your blood that makes your blood plasma more acidic than the normal. This acidic blood plasma leads to a number of problems such as fatigue in your muscles that can drop down your performance in weight lifting. Also, again if you have already done hard cardio exercises before the session of weight lifting, it can be difficult for you to contract your muscles that can again lead to a problem in weight lifting.