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.
Mic Network offers Mic, a news and media company for young people.
Dr. James E. West and a colleague, Gerhard Sessler, developed the mic (officially known as the Electroacoustic Transducer Electret Microphone) while with Bell Laboratories, and they received a patent for it in 1962.