Exertion is a concept describing the use of physical or perceived energy. It normally connotates a strenuous or costly effort related to physical, muscular, philosophical actions and work.



In physics exertion is use of energy against, or for, inertia as described by Isaac Newton's First Law of Motion. In mechanics it describes use of force against a body in direction of its motion (see vector).


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 rating of perceived exertion or RPE-scale , also known as the Borg scale, which is use of a scale to indicate a quantitative feeling of fatigue.


Exertion can be proxied or extended when applied to various human-machine interfaces, like prosthesis, remote control - even for games.

See also


  • 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

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Look at other dictionaries:

  • Exertion — Ex*er tion, n. The act of exerting, or putting into motion or action; the active exercise of any power or faculty; an effort, esp. a laborious or perceptible effort; as, an exertion of strength or power; an exertion of the limbs or of the mind;… …   The Collaborative International Dictionary of English

  • exertion — ⇒EXERTION, subst. fém. Peu usuel. Stimulation, déploiement maximum (des forces, des muscles, de la puissance). La force humaine s exhalait tout entière dans chacune de ses exertions (RENAN, Avenir sc., 1890, p. 303). La moindre monographie d une… …   Encyclopédie Universelle

  • exertion — index campaign, effort, endeavor, industry (activity), pressure, pursuit (effort to secure), stress …   Law dictionary

  • exertion — 1660s, act of exerting, from EXERT (Cf. exert) + ION (Cf. ion). Meaning vigorous action or effort is from 1777 …   Etymology dictionary

  • exertion — *effort, pains, trouble Analogous words: labor, toil, travail, *work, grind, drudgery: struggle, striving, endeavor (see under ATTEMPT vb) Contrasted words: relaxation, *rest, repose, leisure, ease: inactivity, inertness or inertia, idleness (see …   New Dictionary of Synonyms

  • exertion — [n] hard work action, activity, application, attempt, effort, elbow grease*, employment, endeavor, exercise, hard pull*, industry, labor, long pull*, operation, pains, strain, stretch, striving, struggle, toil, travail, trial, trouble, use,… …   New thesaurus

  • exertion — [eg zʉr′shən, igzʉr′shən] n. 1. the act, fact, or process of exerting; active use of strength, power, etc.; exercise 2. energetic activity; effort SYN. EFFORT …   English World dictionary

  • Exertion — (Roget s Thesaurus) < N PARAG:Exertion >N GRP: N 1 Sgm: N 1 exertion exertion effort strain tug pull stress throw stretch struggle spell spurt spirt Sgm: N 1 stroke of work stroke …   English dictionary for students

  • exertion — noun ADJECTIVE ▪ considerable, extreme, great, strenuous, vigorous ▪ mental, physical ▪ Try to avoid physical exertion …   Collocations dictionary

  • exertion — UK [ɪɡˈzɜː(r)ʃ(ə)n] / US [ɪɡˈzɜrʃ(ə)n] noun [countable/uncountable] Word forms exertion : singular exertion plural exertions great physical or mental effort You can expect sore muscles after a lot of physical exertion …   English dictionary

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