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Hydrostatic pressure on the surface of the body due to head-out immersion in water causes negative pressure breathing which shifts blood into the intrathoracic circulation. [ 16 ] Lung volume decreases in the upright position due to cranial displacement of the abdomen due to hydrostatic pressure, and resistance to air flow in the airways ...
The legs of water beetles have little hairs which spread out to catch and move water back in the power stroke, but lay flat as the appendage moves forward in the return stroke. Also, one side of a water beetle leg is wider than the others and is held perpendicular to the motion when pushing backward, but the leg rotates when the limb returns ...
High blood pressure accounts for 35–50% of stroke risk. [110] Blood pressure reduction of 10 mmHg systolic or 5 mmHg diastolic reduces the risk of stroke by ~40%. [111] Lowering blood pressure has been conclusively shown to prevent both ischemic and hemorrhagic stroke. [112] [113] It is equally important in secondary prevention. [114]
The trudgen is a swimming stroke sometimes known as the racing stroke, or the East Indian stroke. It is named after the English swimmer John Trudgen (1852–1902) [1] and evolved out of sidestroke. [2] One swims mostly upon one side, making an overhand movement, lifting the arms alternately out of the water.
Several factors influence the diver, including immersion, exposure to the water, the limitations of breath-hold endurance, variations in ambient pressure, the effects of breathing gases at raised ambient pressure, effects caused by the use of breathing apparatus, and sensory impairment. All of these may affect diver performance and safety. [1]
Combat sidestroke: This stroke was developed and used by the United States Navy SEALs and is designed to be more efficient and reduce profile in the water. Composite stroke is drill stroke within one basic stroke, ins (for example, Front crawl flutter/scissor Dolphin/Dolphin flutter) or between two basic stroke, weens (Over arm 1 Arm Lead ...
More so than most other organs, the brain is very sensitive to increased or decreased blood flow, and several mechanisms (metabolic, myogenic, and neurogenic) are involved in maintaining an appropriate cerebral blood pressure. Brain blood flow autoregulation is abolished in several disease states such as traumatic brain injury, [2] stroke, [3 ...
The cardiovascular system responds to changing demands on the body by adjusting cardiac output, blood flow, and blood pressure. Cardiac output is defined as the product of heart rate and stroke volume which represents the volume of blood being pumped by the heart each minute. Cardiac output increases during physical activity due to an increase ...
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