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  2. Stem cell theory of aging - Wikipedia

    en.wikipedia.org/wiki/Stem_cell_theory_of_aging

    The system theories include the immunologic approach to ageing, rate-of-living and the alterations in neuroendocrinal control mechanisms. (See homeostasis). Cellular theory of ageing can be categorized as telomere theory, free radical theory (free-radical theory of aging) and apoptosis. The stem cell theory of aging is also a sub-category of ...

  3. Post-exertional malaise - Wikipedia

    en.wikipedia.org/wiki/Post-exertional_malaise

    Post-exertional malaise (PEM), sometimes referred to as post-exertional symptom exacerbation (PESE) [1] or post-exertional neuroimmune exhaustion (PENE), [2] is a worsening of symptoms that occurs after minimal exertion. It is the hallmark symptom of myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) and common in long COVID and ...

  4. Occupational burnout - Wikipedia

    en.wikipedia.org/wiki/Occupational_burnout

    They, however, also wrote that burnout can mean "everything from fatigue to a major depression and now seems to have become an alternative word for depression but with less serious significance" (p. 434). In 2005, the Swedish Board of Health and Welfare adopted a category described as "exhaustion disorder". [51] Treatment programs followed.

  5. United States Army enlisted rank insignia 1851–1901

    en.wikipedia.org/wiki/United_States_Army_enlisted...

    The new regulations set out a system of chevrons to show enlisted rank. Chevrons had been used to show rank in the 1820s and sergeants and corporals of dragoons had worn them to show rank since 1833. A system of chevrons was devised in 1847 to show rank on fatigue jackets of all branches that were being worn during the Mexican-American War.

  6. United States Army enlisted rank insignia - Wikipedia

    en.wikipedia.org/wiki/United_States_Army...

    The rank of private was divided into two ranks of private (Grade E1 and Grade E2), and private first class (Grade E3). Corporal was regraded as Grade E4. Sergeant (Grade E5) was a career soldier rank and its former three-chevron insignia was abolished and replaced with the three chevrons and an arc of the rank of staff sergeant.

  7. Naval rating - Wikipedia

    en.wikipedia.org/wiki/Naval_rating

    In a military navy, a rate or rating (sometimes bluejacket in the United States), is a junior enlisted sailor who is below the military rank of warrant officer. They are not commissioned officers . Depending on the country and navy that uses it, the exact term and the range of ranks that it refers to may vary.

  8. Hitting the wall - Wikipedia

    en.wikipedia.org/wiki/Hitting_the_wall

    Until second wind is achieved (increased ATP production primarily from free fatty acids), the symptoms of a low ATP reservoir in exercising muscle due to depleted glycogen include: muscle fatigue, muscle cramping, muscle pain , inappropriate rapid heart rate response to exercise (tachycardia), breathlessness or rapid breathing , exaggerated ...

  9. Muscle fatigue - Wikipedia

    en.wikipedia.org/wiki/Muscle_fatigue

    The combination of an inappropriate rapid heart rate response to exercise with heavy or rapid breathing is known as an exaggerated cardiorespiratory response to exercise. [3] Due to the confusion between muscle fatigue and muscle weakness, there have been instances of abnormal muscle fatigue being described as exercise-induced muscle weakness.

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