Key result
Observation of single sympathetic vasoconstrictor efferents revealed discharge in 21% of heart beats with a mean frequency of 0.47 Hz and a mean within-burst firing rate of 18.8 Hz.
Why the study?
What is the discharge behavior of single vasoconstrictor motoneurones in human muscle nerves?
Population
8 awake supine human subjects (14 single sympathetic vasoconstrictor efferents studied)
Design
Other
Authors
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Sparse single-unit vasoconstrictor firing at rest cautions against overinterpreting multi-unit SNA; leaves open recruitment changes in disease.
Observational (n=8)
What is the discharge behavior of single vasoconstrictor motoneurones in human muscle nerves?
Single sympathetic vasoconstrictor efferents in humans have a low average firing rate but variable instantaneous firing rates, which may optimize vascular smooth muscle contractile responses.
Macefield et al. (1994) reported an observational. Observation of single sympathetic vasoconstrictor efferents was evaluated on Discharge behaviour (firing rate and latency). Observation of single sympathetic vasoconstrictor efferents revealed discharge in 21% of heart beats with a mean frequency of 0.47 Hz and a mean within-burst firing rate of 18.8 Hz.