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  2. Lightheadedness - Wikipedia

    en.wikipedia.org/wiki/Lightheadedness

    If any of these serious disorders are present, the individual will usually have additional symptoms such as chest pain, a feeling of a racing heart, loss of speech or a change in vision. Many people, especially as they age, experience lightheadedness if they arise too quickly from a lying or seated position.

  3. Fatigue - Wikipedia

    en.wikipedia.org/wiki/Fatigue

    Fatigue is a state of tiredness (which is not sleepiness), exhaustion [1] or loss of energy. [2] [3]Fatigue (in the medical sense) is sometimes associated with medical conditions including autoimmune disease, organ failure, chronic pain conditions, mood disorders, heart disease, infectious diseases, and post-infectious-disease states. [4]

  4. 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.

  5. Your resting heart rate can tell you a lot about your health ...

    www.aol.com/finance/resting-heart-rate-tell-lot...

    “The more exercise and regular cardiovascular exertion that you have, the lower your resting heart rate will be,” Ebinger tells Fortune. “That’s a reflection of a healthy cardiovascular ...

  6. Bradycardia - Wikipedia

    en.wikipedia.org/wiki/Bradycardia

    The term "relative bradycardia" can refer to a heart rate lower than expected in a particular disease state, often a febrile illness. [8] Chronotropic incompetence (CI) refers to an inadequate rise in heart rate during periods of increased demand, often due to exercise, and is an important sign of SND and an indication for pacemaker implantation.

  7. Central nervous system fatigue - Wikipedia

    en.wikipedia.org/wiki/Central_Nervous_System_Fatigue

    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]

  8. Feeling so tired all the time? Iron deficiency might be the ...

    www.aol.com/lifestyle/feeling-tired-time-iron...

    From the outset, correcting an iron deficiency may seem small, but it can make a world of a difference in helping you feel empowered and in control of your health. Restoring iron to your body can ...

  9. Hitting the wall - Wikipedia

    en.wikipedia.org/wiki/Hitting_the_wall

    During intense exercise that approaches one's VO 2 max, most of the energy comes from glycogen. A typical untrained individual on an average diet is able to store about 380 grams of glycogen, or 1500 kcal, in the body, though much of that amount is spread throughout the muscular system and may not be available for any specific type of exercise ...

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