Exertion 4329772 213082168 2008-05-17T18:07:16Z Xp54321 6570313 general fixes and cleanup using [[Project:AutoWikiBrowser|AWB]] '''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]]. ==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]]). ==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'' , also known as the [[Borg scale]], which is use of a scale to indicate a quantitative feeling of [[fatigue (physical)|fatigue]]. ==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== {{col-begin}} {{col-break}} *[[exercise]] *[[energy]] *[[cost]] *[[inertia]] {{col-break}} *[[volition (psychology)]] *[[decision theory]] *[[Ferdinand Tönnies]] [as in [[will (sociology)]]] *[[Friedrich Nietzsche]] [as in strong-willed, drive and [[will (philosophy)]]] {{col-break}} *[[Leonhard Euler]] *[[Isaac Newton]] {{col-break}} *[[cybernetics]] *[[bionics]] {{col-end}} ==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'' ==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]] {{psych-stub}}