In 1979, Pol Pot and the Khmer Rouge were forced from power by the invading Vietnamese. Pol Pot officially resigned the leadership in 1985 but appears to have retained considerable influence.
Muscle fatigue. Muscle fatigue is the decline in ability of a muscle to generate force. It can be a result of vigorous exercise but abnormal fatigue may be caused by barriers to or interference with the different stages of muscle contraction.
Rather, scientists' theories that chronic fatigue syndrome could be caused by one or more of the following: 1  Infections. A variety of viruses, including Epstein Barr virus, some types of herpes viruses, and most recently the retrovirus XMRV, been linked to chronic fatigue syndrome.  Genetics.