Muscle sympathetic nerve activity by (microneurograph) blood pressure and heart rate has been studied in patients with amyotrophic lateral sclerosis and in age-matched normal subjects (controls) at rest and during head-up tilt. Muscle sympathetic nerve activity in amyotrophic lateral sclerosis patients was significantly increased at rest unlike controls. There was no correlation between muscle sympathetic nerve activity and age in the patients with amyotrophic lateral sclerosis. Elevated muscle sympathetic nerve activity was present mainly in younger patients. There were no differences between blood pressure or heart rate in either group at rest or during head-up tilt in amyotrophic lateral sclerosis. The increase in muscle sympathetic nerve activity following tilt in the amyotrophic lateral sclerosis patients was less than in the controls, but they had no postural hypotension. The possible reasons for this observation of increased muscle sympathetic nerve activity at rest in amyotrophic lateral sclerosis are discussed.
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Shindo, K., Tsunoda, S. & Shiozawa, Z. Microneurographic analysis of muscle sympathetic nerve activity in amyotrophic lateral sclerosis. Clinical Autonomic Research 3, 131–135 (1993). https://doi.org/10.1007/BF01818998
- Amyotrophic lateral sclerosis
- Muscle sympathetic nerve activity
- Blood pressure
- Heart rate