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. 1995 Dec 15;489(Pt 3):885–894. doi: 10.1113/jphysiol.1995.sp021101

Effect of noxious stimulation on sympathetic vasoconstrictor outflow to human muscles.

M Nordin 1, J Fagius 1
PMCID: PMC1156857  PMID: 8788952

Abstract

1. In fifteen healthy volunteers, muscle nerve sympathetic activity (MSA) was recorded from the peroneal nerve using microneurography. Blood pressure and electrocardiogram were also recorded. 2. Painful stimuli, adjusted to the subject's tolerance level, were delivered over 30-60 s via (a) pressure to the nail-bed of different digits, and to the trigeminal region, (b) electrical stimulation (5 Hz) of digital nerves and of the supraorbital nerve, or (c) instillation of soap solution into one eye. Non-painful ocular pressure was also applied. 3. All procedures except electrical stimulation of digital nerves caused a marked increase in MSA (mean, 160-248%) with preserved pulse synchrony and a rise in blood pressure. Stimulation of digits induced tachycardia, whereas stimulation of the trigeminal region tended to cause bradycardia. 4. Despite similar pain ratings, electrical stimulation of digital nerves caused a smaller MSA response than the other stimuli (mean increase, 40%). 5. It is concluded that sustained noxious stimulation in awake humans evokes a generalized MSA increase; the activity is still under baroreflex control, but the inhibitory level is reset. Both spinal and brainstem reflexes may contribute; a defence reaction is an unlikely explanation. It is suggested that the number of afferent C fibres activated by electrical stimulation of digital nerves was insufficient to induce any marked MSA response. 6. The non-painful oculo-cardiac reflex is associated with a strong increase in MSA.

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Selected References

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