Hardening of the arteries, also called atherosclerosis, occurs when fat, cholesterol, and other substances build up in the walls of arteries. These deposits are called plaques.efinition. Hardening of the arteries, also called atherosclerosis, occurs when fat, cholesterol, and other substances build up in the walls of arteries. These deposits are called plaques. Over time, these plaques can block the arteries and cause problems throughout the body.
CNS fatigue (CNS = central nervous system) is a slightly more convoluted phenomenon, but the term is thrown around frequently in the world of fitness. By itself, the acronym evokes notions of frailty, complication, and extreme caution.NS fatigue (CNS = central nervous system) is a slightly more convoluted phenomenon, but the term is thrown around frequently in the world of fitness. By itself, the acronym evokes notions of frailty, complication, and extreme caution.
Photo Credit facial muscular system image by patrimonio designs from Fotolia.com. Central nervous system fatigue is a complex and multifaceted phenomenon that involves peripheral muscle fatigue and the failure to initiate and sustain voluntary drive to the muscles by the central nervous system.levated levels of circulating cytokines, particularly TNF-alpha, IL-6, and IL-1beta are known to mediate the effect of fatigue from the muscle to the brain. Further more, abnormal immune response to viral infections are also associated with central nervous system fatigue.