Why the study?
Does head-down neck flexion increase muscle sympathetic nerve activity and alter vascular responses in humans?
Population
Humans
Comparison
Head-down neck flexion at different magnitudes… vs Baseline (supine position)
Design
Other
Follow-up
30 minutes
Authors
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May influence sympathetic tone during head positioning; leaves open relevance to orthostatic or autonomic disorders.
Does head-down neck flexion increase muscle sympathetic nerve activity and alter vascular responses in humans?
Head-down neck flexion increases muscle sympathetic nerve activity and decreases calf blood flow in a magnitude-dependent manner, independent of nonspecific cerebral pressure receptors.
Hume et al. (1999) studied this question.
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