There are some general properties shared by all forms of electromagnetic radiation: 1  It can travel through empty space. 2  The speed of light is constant in space. 3  A wavelength of light is defined similarly to that of water waves---distance between crests or between troughs.
The Parkinson Handbook Fatigue and Parkinsonâs Disease. Fatigue due to Depression-Depression is common in people with Parkinson's disease. It occurs in about 40% of the patients. Fatigue is a typical symptom of depression and is often reported as a lack of motivation or a loss of energy.
Researchers have noted that exhaustion and fatigue are the single most common symptom of liver damage, and it typically has a significant and damaging impact on the patientâs quality of life. Unfortunately, the specific causes of liver disease-related fatigue and exhaustion are not fully understood. Researchers speculate that the root cause of liver disease-related chronic fatigue may be caused by changes in brain chemistry and hormone levels which result from impaired liver function. In particular, altered levels of corticotropins, serotonin, and noradrenaline may be at the root of depleted energy levels.