| bradycardia | a resting heart rate less than sixty beats per minute.
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| ejection fraction | the proportion of end-diastolic volume that is ejected during a ventricular contraction.
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| overload | a principle of training describing the need to increase the load (intensity) of exercise to cause a further adaptation of a system.
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| reversibility | a principle of training that describes the temporary nature of a training effect; adaptations to training are lost when the training stops.
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| specificity | a principle of training indicating that the adaptation of a tissue is dependent on the type of training undertaken; for example, muscles hypertrophy with heavy resistance training but show an increase in mitochondria number with endurance training.
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