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Essay / Research Paper Abstract
A paper which considers the function of respiratory sinus arrhythmia as an active part of the cardiopulmonary system, and its use as a measurement of vagal tones. Bibliography lists one source.
Page Count:
5 pages (~225 words per page)
File: JL5_JLrsa2.rtf
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Unformatted sample text from the term paper:
heart rate varies, which is known to be synchronised with respiration. This can be seen on an ECG trace as a shortened R-R interval which occurs on inspiration, and a
longer one which occurs during expiration. Respiratory sinus arrhythmia can be seen in all types of vertebrates, and can be used to demonstrate the interaction between circulation and respiration.
Respiratory sinus arrhythmia is particularly important in measuring heart rate reactivity in patients: this
is the mean increase in heart rate that can be observed as the subject undergoes a particular task or stressor. This variability in heart rate is indicated by the
beat by beat alterations which can be observed in the rate, and even under resting conditions an organism will show variations in these intervals from time to time. This is
the phenomenon known as respiratory sinus arrhythmia and it is seen to fluctuate as respiration takes place. The rate increases as the individual breathes in and decreases on expiration. If
the variation in heart rate is reduced, this can be used to indicate correspondingly reduced vagal activity. However, since the variation is measured through ECG, vagal activity in the brain
cannot be measured, only the variation in the heart. Respiratory sinus arrhythmia has therefore been generally investigated from the point of view of its use as an index to heart
and respiratory action. It is particularly useful because it allows the task or stressor which the individual is undergoing to be kept separate from the means of measurement.
Heart rate reactivity can be used to measure individual differences in response to stress, or
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