The effect of pain on changes in
heart rate during the Valsalva manoeuvre |
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Authors: | Email author" target="_blank">Peter?D?DrummondEmail author |
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Institution: | (1) School of Psychology, Murdoch University, 6150, Western Australia |
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Abstract: | Abstract.
The presence of pain may influence autonomic function in
patients with painful neurological or cardiovascular disorders.
The aim of the present study was to determine whether pain
influences cardiac baroreflexes during the Valsalva manoeuvre.
Eighteen healthy subjects immersed their hand twice at each
temperature in 30 °C water and painfully hot (47 °C) and cold
water (12 °C and 7 °C) for 2.5 minutes, followed by 5 minute
rest periods. During 50% of the immersions, subjects performed
the Valsalva manoeuvre (40 mmHg for 30 seconds) starting one
minute after their hand entered the water. Pain ratings and
heart rate were greater during the 7 °C and 47 °C immersions
than during the 12 °C and 30 °C immersions. Pain-induced
increases in heart rate did not influence peak tachycardia
during phase II or III of the Valsalva manoeuvre or peak
bradycardia during phase IV, but opposed bradycardia during the
post-strain recovery period. Further studies are needed to
establish whether pain influences indices of autonomic function
during clinical assessment. |
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Keywords: | Valsalva manoeuvre baroreflex pain heart rate |
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