It is this build up of lactic acid that causes the pain, heaviness, feeling of exhaustion, deadened muscles, and 'muscles will not work or go any faster' sensation. I am also interested in this idea because in horses there is a condition known as azoturia (tying up), which does not have an obvious human parallel.
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Integrated Services Digital Network (ISDN) is a set of communication standards for simultaneous digital transmission of voice, video, data, and other network services over the traditional circuits of the public switched telephone network. It was first defined in 1988 in the CCITT red book.