Fatigue refers to a loss of work capacity that results when the body depletes its energy and is unable to maintain a steady level of performance.

See also:
"Fatigue" is in the UNSPSC Code "41114608"
  Fatigue testers

Other /More definition:
Fatigue can be defined as: (1) a loss of work capacity that results when the body depletes its energy stores and is unable to maintain a steady level of performance. (2) a threat to internal validity that occurs when prior participation in a treatment condition or measurement procedure tires the participants and influences their performance on subsequent measurements. An example of a testing effect or an order effect.

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