![]() It is for this reason that we have added a small feature under Advanced mode that lets you estimate the calories you burnt on your ride. Not only are calories a common way for people to measure the level of activity they performed, but it also helps you better plan your nutrition and provides a measure by which you can set goals, be it fat loss, performance improvement, or building muscle. ![]() Of all of these values, the most mainstream of them has to be calorie consumption. By knowing your power, you can learn about your performance, health, and even the state of your body. 100 W output = 400 kcal per hour, etc.For a cyclist, power is probably the most useful piece of data you can get. If you want a simple translation - for a certain number of Watts of power output, the calories per hour burned are roughly 3.6 times as much (or 4x if you are into round numbers). ![]() This is because the calorie is equivalent to roughly 4.2 J - the energy needed to heat one gram of water by one degree Celsius. If one flight of stairs is 2.5 m vertically, then a 70 kg person needs to do about 1750 J of work to climb one flight of stairs, and will burn just under 2 (kilo) calories by doing so. You can see this when you are climbing stairs. Your body is roughly 25% efficient in converting "calories" (which are actually kilo calories) to Joules - meaning that if you work out hard enough to burn 600 kcal per hour, then you actually produced about 600 kJ, or 10 kJ per minute, roughly 170 W "useful output". Top athletes can produce more - in short bursts. When you work "fairly hard", your body can produce about 200 W of power - enough for two incandescent bulbs. However, since we need chemical food sources and the synthesis of sugars, starches, protein and fatty acids in plants is very inefficient, a human being requires at least about a third of an acre of land to support his food needs by growing crops and a lot more if we want to have a diet rich in animal protein. If we could electrically recharge, we would require approx. If we could power ourselves by sunlight directly and if the process was thermodynamically efficient, we could just about support our base metabolism by sunbathing all day long. The ratio between mechanical power output and chemical power consumption will vary from person to person and between different activities.Īnother important way of looking at the power consumption of the human body is for environmental purposes. A precise measurement requires wearing a mask which can capture the CO2 that we breath out, which is a reasonably reliable chemical indicator for how much chemical energy we actually consume. This is only a rough estimate, of course. for a mechanical power output of 100W, the equipment will estimate the number of calories burned in the range of 500-600kcal/h. Since the efficiency of our muscle tissue is relatively low (18-26%), workout equipment that tells us our "power output" is usually calibrated around 15-20%, i.e. As you can see, even light exercise will increase the metabolic rate of the human body enormously, which is good for ones health. almost 2kW in chemical energy being consumed. Physical exercise varies between light (300kcal/h) at an additional 350W to very strenuous at probably six times as much, i.e. A day has 86400 seconds, which brings us to an average power consumption of 72-120W. Since one kcal equals 4148J in SI units, that's between 6.2-10.4MJ per day.
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