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In fact, recent research estimates 40% of girls and young women aged 12 to 21 in the US are affected by iron deficiency, with menstruation listed as the primary risk factor. Pregnancy and ...
Post-coital tristesse (PCT) is a feeling of melancholy and anxiety after sexual intercourse that lasts anywhere from five minutes to two hours. PCT, which affects both men and women, occurs only after sexual intercourse and does not require an orgasm to occur, and in that its effects are primarily emotional rather than physiological.
Delayed onset muscle soreness (DOMS) is the pain and stiffness felt in muscles after unaccustomed or strenuous exercise. The soreness is felt most strongly 24 to 72 hours after the exercise. [1] [2]: 63 It is thought to be caused by eccentric (lengthening) exercise, which causes small-scale damage (microtrauma) to the muscle fibers. After such ...
In the brain, serotonin is a neurotransmitter and regulates arousal, behavior, sleep, and mood, among other things. [9] During prolonged exercise where central nervous system fatigue is present, serotonin levels in the brain are higher than normal physiological conditions; these higher levels can increase perceptions of effort and peripheral muscle fatigue. [9]
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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.
A 2021 German study found that fatigue was the main or secondary reason for 10–20% of all consultations with a primary care physician. [211] A large study based on the 2004 Health and Retirement Study (HRS), a biennial longitudinal survey of US adults aged 51 and above, with mean age 65, found that 33% of women and 29% of men self-reported ...
Symptoms might get worse, improve, or the illness may go into remission for a period of time. [11] People who feel better for a period of time may overextend their activities, triggering PEM and a worsening of symptoms. [34] Those with severe and very severe ME/CFS experience more extreme and diverse symptoms.