1. 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.

Keywords:
bethanidine, clonidine, isometric exercise, oxprenolol, phenoxybenzamine, phentolamine, pressor response, sympatholytic drugs
This content is only available as a PDF.
© 1981 The Biochemical Society and the Medical Research Society
1981
You do not currently have access to this content.