Why the study?
Do single oral doses of sympatholytic drugs reduce heart rate and blood pressure increases during isometric exercise in healthy subjects?
Do single oral doses of sympatholytic drugs reduce heart rate and blood pressure increases during isometric exercise in healthy subjects?
The increase in systemic blood pressure during sustained voluntary muscle contraction is relatively resistant to acute sympathetic adrenoreceptor blockade in humans.
Isometric exercise pressor response resists acute sympatholysis in healthy subjects; leaves open effects of chronic therapy or in cardiovascular disease.
The effects of single oral doses of various sympatholytic drugs on the heart rate and blood pressure increases during isometric handgrip contraction were studied in six healthy subjects. 2. Bethanidine reduced both the systolic and diastolic increases in pressure. Clonidine reduced the systolic but not the diastolic increase. Oxprenolol alone or in combination with phentolamine or phenyoxybenzamine failed to influence the pressor response. 3. The increase in systemic blood pressure associated with sustained contraction of voluntary muscle appears to be relatively resistant to acute sympathetic adrenoreceptor blockade in man.
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Watt et al. (1981) studied this question.
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