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It is bodily movement produced by skeletal muscles that results in energy expenditure. The term, physical activity, does not require or imply any specific aspect or quality of movement. The term encompasses all types, intensities, and domains. Although the term ―physical activity‖ has been used often as a short-hand description for moderate-to-vigorous-intensity forms of physical activity, given current interest and discussions about physical activity of intensities less than moderate-intensity, the term ―physical activity‖ should be used when discussing the full range of intensities. More specific descriptors such as sedentary behavior, light, moderate, vigorous, or moderate-to-vigorous should be used when talking about a specific range of intensities. Based on predominant physiologic effect, physical activity can be categorized in to aerobic physical activity and anaerobic physical activity. Aerobic physical activity includes forms of activity that are intense enough and performed long enough to maintain or improve an individual‘s cardiorespiratory fitness. Aerobic activities such as walking, basketball, soccer, or dancing, commonly require the use of large muscle groups. The connection between aerobic activities such as these and cardiorespiratory fitness is sufficiently close that the term ―aerobic capacity‖ is considered equivalent to cardiorespiratory fitness. Technically, aerobic physical activity includes any activity that could be maintained using only oxygen-supported metabolic energy pathways and could be continued for more than a few minutes. However, in both common and scientific usage, ―aerobic‖ activity has come to mean physical activity that would be expected to maintain or improve cardiorespiratory fitness or 
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