Here are ten things you should know about lactic acid.

1. Lactic acid is formed from the breakdown of glucose.

During this process the cells make ATP (adenosine triphosphate), which provides energy for most of the chemical reactions in the body. Lactic acid formation doesn't use oxygen, so the process is often called anaerobic metabolism. Lactate-related ATP production is small but very fast. This makes it ideal for satisfying energy needs anytime exercise intensity exceeds 50% of maximum capacity.

2. Lactic acid doesn't cause muscle soreness and cramps.

Delayed onset muscle soreness, the achy sensation in your muscles the day after a tough workout, is caused by muscle damage and post-exercise tissue inflammation. Most muscle cramps are caused by muscle nervous receptors that become overexcitable with muscle fatigue.

Many athletes use massage, hot baths, and relaxation techniques to help them rid their muscles of lactic acid and thus relieve muscle soreness and cramping. While these techniques probably have other benefits, getting rid of lactic acid isn't one of them. Lactate is used rapidly for fuel during exercise and recovery and doesn't remain in the muscles like motor oil.

3. The body produces lactic acid whenever it breaks down carbohydrates for energy.

The faster you break down glucose and glycogen the greater the formation of lactic acid. At rest and submaximal exercise, the body relies mainly on fats for fuel. However, when you reach 50% of maximum capacity, the threshold intensity for most recreational exercise programs, the body "crosses over" and used increasingly more carbohydrates to fuel exercise. The more you use carbohydrates as fuel, the more lactic acid you produce.

4. Lactic acid can be formed in muscles that are receiving enough oxygen.

As you increase the intensity of exercise, you rely more and more on fast-twitch muscle fibers. These fibers use mainly carbohydrates to fuel their contractions. As discussed, whenever you break down carbohydrates for energy, your muscles produce lactic acid. The faster you go, the more fast-twitch muscles you use. Consequently, you use more carbohydrates as fuel and produce more lactic acid. Increased blood lactic acid means only that the rate of entry of lactic acid into the blood exceeds the removal rate. Oxygen has little to do with it.

5. Many tissues, particularly skeletal muscles, continuously produce and use lactic acid.

Blood levels of lactic acid reflect the balance between lactic acid production and use. An increase in lactic acid concentration does not necessarily mean that the lactic acid production rate was increased. Lactic acid may increase because of a decreased rate of removal from blood or tissues.

Lactic acid production is proportional to the amount of carbohydrates broken down for energy in the tissues. Whenever you use carbohydrates, a significant portion is converted to lactate. This lactate is then used in the same tissues as fuel, or it is transported to other tissues via the blood stream and used for energy. Rapid use of carbohydrate for fuel, such as during intense exercise, accelerates lactic acid produciton. Temporarily, lactic acid builds up in your muscles and blood because it can't be used as fuel fast enough. However, if you slow down the pace of exercise or stop exercising, the rate of lactate used for energy soon catches up with the rate of lactate production.

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