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Abstract : Lactic acid is produced during intense levels of exercise when the
oxygen demands of the muscle fibers increase beyond what the blood is capable
of delivering. To produce the energy needed, the body begins another process,
which works in the absence of oxygen. Lactic acid—a byproduct of this
process—locks up your muscles, and because it is an acid it causes your muscles
to experience that burning sensation. But lactic acid is completely washed out
of the muscles within 30 to 60 minutes after finish the exercise.Since muscle soreness
does not show up until 24 to 36 hours later. Over the 24 hours, the damaged
muscle becomes swollen and sore. Chemical irritants are released from the
damaged muscles and can irritate pain receptors. In addition to the injured
fibers, there is increased blood flow from increased activity to the muscle,
causing a swelling of the muscle tissues, which causes enough pressure to
stimulate pain receptors. Instead of having free-moving muscle fibers the
next morning, the fibers that are fatigued, have microscopic tears and are
swollen.
Key words : lactic acid, skeletal muscle soreness
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