Category: O
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Olfactory hallucination
Perception of odor, such as of burning rubber or decaying fish.
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Oppositional defiant disorder
Symptoms may include losing temper; arguing with adults and actively refusing their requests; deliberately annoying others; blaming others for one’s mistakes; being easily annoyed, resentful, or spiteful; and physically fighting with other members of the household. A pattern of negativistic and hostile behavior in a child that lasts at least 6 months. symptoms may include…
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Oxygen deficit
The time when commencing exercise where there is an inadequate oxygen supply. The difference between the oxygen required during exercise and the oxygen supplied and utilized. Occurs at the onset of all activities. Condition existing in cells during a period of temporary oxygen shortage, as, for example, during strenuous exercise, when energy is obtained through…
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Oxygen debt
The volume of oxygen required to oxidize the lactic acid produced by exercise. The amount of oxygen required in the postexercise period in excess of oxygen consumption to reverse the anaerobic reactions during exercise period. A physical state that occurs when the body can no longer process and transport sufficient amounts of oxygen for continued…
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Oxidative system
An aerobic metabolic system in the body that yields large amounts of ATP and the by-products carbon dioxide, water, and heat.
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Overweight
A condition in which an individual’s weight exceeds the population norm or average, which is determined by height-weight tables based on gender, height, and frame size. Being too heavy for one’s height. It is defined as a body mass index (BMI) of 25 up to 30 kg per m². Body weight comes from fat, muscle,…
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Overuse injuries
Repetitive injury caused by repetitive activities, such as tendonitis or bursitis.
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Overtraining
Excessive exercise resulting in various physical symptoms, such as chronic fatigue or insomnia. Excessive hard training on a frequent basis. A condition that occurs as a result of exceeding the recommendations of the FITT formula.
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Origin
Most muscles have at least two tendons, each one attaching to a bone. One of these attachments tends to be more stationary or immobile and is referred to as the muscle’s origin. Point or region where DNA (deoxyribonucleic acid) replication is begun. Often abbreviated “Ori.” The source or beginning of something. A place where a…
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Omega-3 fatty acid (also called omega 3s)
Considered essential fatty acids, thus must be consumed in the diet. Found in certain cold-water fish and some plant and nut oils. Essential polyunsaturated fats that are a crucial component of cell membranes throughout the body and an integral component of the brain. A unique group of polyunsaturated fatty acids found in fish oil and…