Abstract
To verify whether high level of bladder distension may counteract the inhibitory effect of descending pathways on sacral spinal cord neurons and to investigate which spinal circuitries are possibly involved in such a viscero-somatic interaction. Nociceptive withdrawal reflex (NWR), cutaneous silent period (CSP), and H-reflex were recorded in both lower and upper limbs of twenty-eight healthy subjects. Subjects were examined during baseline (empty bladder, no voiding desire), high level of bladder filling (urgency desire), and control (empty bladder, no voiding desire) sessions. Results showed that the NWR and its related pain perception were reduced in the upper limbs, while only a pain perception reduction in males was observed in the lower limbs. The H-reflex was inhibited in both limbs. No effects were found on the CSP duration. The decrease in both the NWR and its related pain perception in the upper limbs confirms the presence of a bladder distension-induced descending inhibitory modulation on nociception at spinal level. The lack of a similar inhibitory effect in the lower limbs suggests that excitatory nociceptive inputs from bladder afferents counterbalance the inhibitory effect on sacral spinal cord. The lack of the descending inhibitory effect may be a mechanism aimed at forcing the micturition phase to avoid bladder damage caused by bladder sovradistension.
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Abbreviations
- PAG:
-
Periaqueductal gray
- NRM:
-
Nucleus raphe magnum
- LC:
-
Locus coeruleus
- CNS:
-
Central nervous system
- NWR:
-
Nociceptive withdrawal reflex
- CSP:
-
Cutaneous silent period
- RT:
-
Reflex threshold
- NRS:
-
Numerical rating scale
- WDR:
-
Wide dynamic range
- DNIC:
-
Diffuse noxious inhibitory control
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Gaia Fragiotta and Francesca Cortese have equally contributed to this work.
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Fragiotta, G., Cortese, F., Coppola, G. et al. Effect of high level of bladder filling on spinal nociception and motoneuronal excitability. Exp Brain Res 233, 3459–3466 (2015). https://doi.org/10.1007/s00221-015-4416-4
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DOI: https://doi.org/10.1007/s00221-015-4416-4