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absolute error

Overview page. Subjects: Psychology — Sports and Exercise Medicine.

In psychophysics, the difference between the judged value of a stimulus and its true value, ignoring the direction of the difference. Compare relative error. [Alluding to the mathematical...

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absolute refractory period

Overview page. Subjects: Sports and Exercise Medicine — Psychology.

A refractory period (2), lasting up to 2 milliseconds after the onset of an action potential, during which no stimulus (5) can initiate another nerve impulse in the neuron. Compare relative...

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abstinence syndrome

Overview page. Subjects: Sports and Exercise Medicine — Psychology.

A pattern of signs and symptoms associated with withdrawal in a drug-dependent person who is suddenly deprived of a regular supply of the drug and is forced to practise abstinence (1).

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acceleration

Overview page. Subjects: Mathematics — Sports and Exercise Medicine.

The rate of change in velocity or the change in velocity occurring over a given time interval: acceleration = change of velocity/time. It is usually expressed as metres per second squared...

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acceleration of free fall

Overview page. Subjects: Science and Mathematics — Sports and Exercise Medicine.

(g)

The acceleration experienced by an object falling freely in a gravitational field, also known as the acceleration due to gravity. Its mean value at the Earth's surface is 9.807...

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achievement test

Overview page. Subjects: Sports and Exercise Medicine — Psychology.

Any test of acquired ability or skill, a typical example being a test of scholastic attainment. See also competency test. Compare ability test, aptitude test.

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adrenalin rush

Overview page. Subjects: Sports and Exercise Medicine — Psychology.

A sudden increase in competitive drive displayed by an athlete or sports competitor, supposedly associated with the release of adrenalin into the bloodstream. This expression is based on a...

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air resistance

Overview page. Subjects: Sports and Exercise Medicine — Mathematics.

The resistance to motion experienced by an object moving through the air caused by the flow of air over the surface of the object. It is a force that affects, for example, the speed of a...

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alanine

Overview page. Subjects: Sports and Exercise Medicine — Chemistry.

(Ala, A)

Usually, l-α-alanine (89 Da), the aliphatic amino acid found in proteins. The isomer β-alanine is a component of the vitamin pantothenic acid and coenzyme A. See...

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alpha motor neuron

Overview page. Subjects: Psychology — Sports and Exercise Medicine.

The largest type of spinal motor neuron, supplying skeletal muscles and forming alpha fibres. Also called an alpha motoneuron. Compare gamma motor neuron, Renshaw cell.

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