Lactic acid build up is a source of fatigue, not muscle soreness. Check this article:
Quote:
The expression lactic acid, or lactate, is used most commonly to describe the intense pain felt during exhaustive exercise, especially short events like the 400 metres and 800 metres. To explain what it is we first have to look briefly into how the working muscles use energy (ATP). Actively contracting muscles obtain Adenosine Triphosphate (ATP) from glucose stored in the blood stream and the breakdown of glycogen stored in the muscles. Initially pyruvic acid and small amounts of ATP are generated from the breakdown of glucose. The pyruvic acid mixed with oxygen is converted to carbon dioxide, water and ATP. When muscles contract vigorously for long periods the circulatory system begins to lose ground in delivery of oxygen. In these conditions most of the pyruvic acid produced in the breakdown of glucose is converted to lactic acid (LA). As the lactate is produced in the muscles it leaks out into the blood and is carried around the body. If this condition continues the functioning of the body will become impaired and the muscles will fatigue very quickly. When oxygen becomes available the lactic acid is converted to pyruvic acid and then into carbon dioxide, water and ATP.
From this article: http://www.brianmac.demon.co.uk/lactic.htm
|
I have a hard time buying that muscle soreness is not due to tearing and rebuilding. Frankly, I know that when I am sore it hurts in the entire muscle, not just around the joints where the connective tissues reside.