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The brain is enormously costly to the rest of the body, in terms of oxygen and nutrient consumption. It can require up to 20 percent of the body's energy—more than any other organ—despite making up only 2 percent of the human body weight.
The Presidential Fitness Test was a national physical fitness testing program conducted in United States public middle and high schools from the late 1950s until 2013, when it was replaced with the Presidential Youth Fitness Program. National interest in physical fitness testing existed in the United States since the late 1800s. [1]
The scoring for each event in the test is dependent upon a Marine's sex and age group in all events, [12] except for planking where all sexes and ages use the same scoring scale. [10] The minimum combined score required to pass the PFT is 150. The maximum possible score is 300. [13]
Normal arterial blood oxygen saturation levels in humans are 96–100 percent. [1] If the level is below 90 percent, it is considered low and called hypoxemia. [2] Arterial blood oxygen levels below 80 percent may compromise organ function, such as the brain and heart, and should be promptly addressed.
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The brain requires approximately 3.3 ml of oxygen per 100 g of brain tissue per minute. Initially, the body responds to lowered blood oxygen by redirecting blood to the brain and increasing cerebral blood flow. Blood flow may increase up to twice the normal flow but no more. If the increased blood flow is sufficient to supply the brain's oxygen ...
The Army Physical Fitness Test (APFT) was a test designed to measure the muscular strength, endurance, and cardiovascular respiratory fitness of soldiers in the United States Army. The test contained three events: push-ups , sit-ups , and a two-mile run with a soldier scoring from 0 to 100 points in each event based on performance.
V̇O 2 max (also maximal oxygen consumption, maximal oxygen uptake or maximal aerobic capacity) is the maximum rate of oxygen consumption attainable during physical exertion. [1] [2] The name is derived from three abbreviations: "V̇" for volume (the dot over the V indicates "per unit of time" in Newton's notation), "O 2" for oxygen, and "max" for maximum and usually normalized per kilogram of ...