| 1. | A decrease in vagal tone and increase in sympathetic tone is the cause.
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| 2. | Instead, other biological processes are measured that represent the functionality of vagal tone.
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| 3. | Thus, while vagal tone is not explicitly measured, the resultant changes in heart rate are.
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| 4. | Under resting conditions, vagal tone prevails and variations in heart period are largely dependent on vagal modulation.
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| 5. | Vagal tone cannot be directly measured.
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| 6. | The progressive dilation of the airway with increasing exercise is mediated by a progressive reduction in resting vagal tone.
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| 7. | A junctional escape complex is a normal response that may result from excessive vagal tone on the SA node.
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| 8. | In the resting state, there is a large degree of vagal tone on the heart, which is responsible for low resting heart rates.
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| 9. | This seems to be due to an increase in vagal tone, a measure of the control the vagus nerve has over the heartbeat.
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| 10. | An increase in vagal tone both slows the heart and makes heart rate more variable ( i . e . there is more beat-to-beat change between heart beats ).
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