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.
Common causes of fatigue include: 1  Inadequate sleep. 2  Anxiety and depression. 3  Increased energy exertion secondary to movement problems.  Reduced stamina and 1  deconditioning. Secondary to medicines for movement, pain, mood.  A primary symptom of the disease itself.