![]() Intensity can simultaneously remove our biggest barrier to exercise, while increasing the health benefits of this exercise. Australians indicate that time is the biggest factor standing in the way of exercise. The longer the duration, the less the intensity. ![]() Remember of course than intensity is inversely related to duration. For you… move the largest load YOU can, the longest distance YOU can, as quickly as YOU can. If you move a larger load and longer distance, more quickly, you do more work. Moving large loads, long distances, quickly. How much load you move (whether it be your body weight or an external object), how far you move it, and how quickly you move it. Intensity is the amount of work you do in a certain amount of time. All great lab based measures – but with real world limitations. Laboratory bound Exercise Physiologists would use METS (metabolic equivalents), percentages of maximum heart rate, heart rate reserve, or VO2 max. So what is intensity? The definitions are numerous. This is a result of both a desperate clinging to outdated research of a bygone era and an aversion to departing from the comfort zone. We value quantity of exercise over quality of exercise. We live in a volume obsessed physical culture. Take note, intensity NOT duration is the most important variable. Intensity is the single most important variable in maximising the health benefits of exercise. So why is this so worrying? What’s so important about intensity? “…the median level of vigorous-activity is consistently zero minutes.” That doesn’t even take into account high-intensity activity, which is more intense than the vigorous-intensity activity alluded to in the survey. 2007) reveals that reported measures of exercise intensity “…show the median level of vigorous-activity is consistently ZERO minutes.” The shading is proportional to intensity.Research (Gill et. These stereo speakers produce both constructive interference and destructive interference in the room, a property common to the superposition of all types of waves. We will pursue interference patterns elsewhere in this text. Figure 2 shows what this interference might look like. For example, if we have two stereo speakers putting out each, there will be places in the room where the intensity is other places where the intensity is zero, and others in between. We actually get a pattern of both constructive interference and destructive interference whenever two waves are added. The addition of waves is not as simple as our first look in Chapter 16.10 Superposition and Interference suggested. There are other areas where the intensity is zero. The area over which the intensity is is much less than the area covered by the two waves before they interfered. This violation, of course, cannot happen. The two individual waves each have intensities of yet their sum has an intensity of which may appear to violate conservation of energy. The intensity goes up by a factor of 4 when the amplitude doubles. In fact, a wave’s energy is directly proportional to its amplitude squared because Because work is related to force multiplied by distance and energy is put into the wave by the work done to create it, the energy in a wave is related to amplitude. The larger the displacement the larger the force needed to create it. More quantitatively, a wave is a displacement that is resisted by a restoring force. Large ocean breakers churn up the shore more than small ones. ![]() Loud sounds have higher pressure amplitudes and come from larger-amplitude source vibrations than soft sounds. Large-amplitude earthquakes produce large ground displacements. The amount of energy in a wave is related to its amplitude. Ultrasound is used for deep-heat treatment of muscle strains. Loud sounds pulverize nerve cells in the inner ear, causing permanent hearing loss. Earthquakes can shake whole cities to the ground, performing the work of thousands of wrecking balls. The energy of some waves can be directly observed. (credit: Petty Officer 2nd Class Candice Villarreal, U.S. The Richter scale rating of earthquakes is related to both their amplitude and the energy they carry. The destructive effect of an earthquake is palpable evidence of the energy carried in these waves.
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