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In psychological terms exertion is a perceived measure of expenditure or cost. Conceptually it is also used to describe the use of power (sociological or mental) - like in (violent) force or will (philosophy), but also in economics as in cost. Philosophically it is used as a concept or percept for something different than rest - i.e activity, indicating some sort of decision making or motivation - like instinctal drive.
In medical terms exertion is the expenditure of energy by skeletal muscles. The intensity of this action can be measured by the rate of which oxygen is expended, heat is produced and heart rate. A frequently used term is rate of perceived exertion or RPE-scale which is use of a scale to indicate a quantitive feeling of fatigue.
- First Person Physics, First Person Physics:Wooing the Second Tier, (essay part of) project proposal to National Science Foundation, 2004
- Principle of least action, Euler, 1748, Reflexions sur quelques loix generales de la nature
- Measuring Physical Activity Intensity: Perceived Exertion (Borg Rating of Perceived Exertion Scale)
- RPE-scale (2nd)
- First principle of mechanics
- Exertion interfaces allowing exertion by proxy in sporting games.
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