View source for Exertion

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'''Exertion''' is a concept describing the use of physical or perceived [[energy]]. It normally [[connotation|connotates]] a strenuous or [[cost]]ly ''effort'' related to [[action (physics)|physical]], [[action (philosophy)|philosophical]] actions and [[Mechanical work|work]].

==Concept==
In [[psychological]] terms ''exertion'' is a [[perceive]]d ''[[measurement|measure]]'' of expenditure or [[cost]].
[[Concept]]ually it is also used to describe the use of power ([[power (sociology)|sociological]] or [[mind|mental]]) - like in ([[violent]]) [[force]] or [[will (philosophy)]], but also in [[economics]] as in [[cost]]. [[Philosophical]]ly it is used as a [[concept]] or [[percept]] for something different than rest - i.e [[action (philosophy)|activity]], indicating some sort of [[decision making]] or [[motivation]] - like [[instinct]]al drive.

==Physical==
In [[physics]] ''exertion'' is use of [[energy]] against, or for, [[inertia]] as described by [[Isaac Newton]]'s [[Newton's Laws of Motion|First Law of Motion]]. In [[mechanics]] it describes use of [[force]] against a [[body]] in direction of its [[Motion (physics)|motion]] (see [[vector (spatial)|vector]]).
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==Medical==
In [[medical]] terms ''exertion'' is the [[expenditure]] of [[energy]] by [[skeletal]] [[muscle]]s. The [[intensity]] of this [[Action (physics)|action]] can be [[measurement|measured]] by the [[rate]] of which [[oxygen]] is expended, [[heat]] is produced and [[heart]] rate.
A frequently used term is ''rating of perceived exertion'' or ''[[Exertion|RPE]]-scale'' which is use of a scale to indicate a quantitive feeling of [[fatigue (physical)|fatigue]].
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==Cybernetics==
Exertion can be proxied or extended when applied to various human-machine [[User interface|interfaces]], like [[prosthesis]], [[remote control]] - even for [[game]]s.

==See also==
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*[[exercise]]
*[[energy]]
*[[cost]]
*[[inertia]]
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*[[volition (psychology)]]
*[[decision theory]]
*[[Ferdinand Tönnies]] [as in [[will (sociology)]]]
*[[Friedrich Nietzsche]] [as in strong-willed, drive and [[will (philosophy)]]]
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*[[Leonhard Euler]]
*[[Isaac Newton]]
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*[[cybernetics]]
*[[bionics]]
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==References==
*[http://physics.unl.edu/~rpeg/First_Person_Physics/urneressay.html 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''
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==External links==
{{Wiktionary}}
*[http://www.cdc.gov/nccdphp/dnpa/physical/measuring/perceived_exertion.htm Measuring Physical Activity Intensity: Perceived Exertion (Borg Rating of Perceived Exertion Scale)]
*[http://smccd.net/accounts/mcgill/RPE.html RPE-scale] [http://www.clevelandclinic.org/heartcenter/pub/guide/prevention/exercise/rpe.htm (2nd)]
*[http://www.history.rochester.edu/Scientific_American/vol1/vol1n004/fpom.htm First principle of mechanics]
*[http://exertioninterfaces.com/index.htm Exertion interfaces] allowing exertion by proxy in sporting games.

[[Category:Energy]]
[[Category:Exercise]]
[[Category:Exercise physiology]]
[[Category:Motivation]]

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