Cutaneous warmth, but not touch, increases muscle sympathetic nerve activity during a muscle fatigue hand-grip task

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Cutaneous warmth, but not touch, increases muscle sympathetic nerve activity during a muscle fatigue hand-grip task

Ackerley, Rochelle, 1980 (author): Gothenburg University,Göteborgs universitet,Institutionen för neurovetenskap och fysiologi,Institute of Neuroscience and Physiology,Sahlgrens Univ Hosp, Sweden; Univ Gothenburg, Sweden; Aix Marseille Univ, France

Sverrisdottir, Y. B. (author): Sahlgrens Univ Hosp, Sweden

Birklein, F. (author): Johannes Gutenberg Univ Mainz, Germany

Elam, M. (author): Sahlgrens Univ Hosp, Sweden

Olausson, Håkan (author): Linköpings universitet,Centrum för social och affektiv neurovetenskap,Medicinska fakulteten,Region Östergötland, Neurofysiologiska kliniken US,Sahlgrens Univ Hosp, Sweden

Kramer, H. H. (author): Sahlgrens Univ Hosp, Sweden; Justus Liebig Univ, Germany

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2020-03-20
2020
English.
In: Experimental Brain Research. - : Springer Science and Business Media LLC. - 0014-4819 .- 1432-1106. ; 238, s. 1035-1042

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Journal article (peer-reviewed)

Abstract Subject headings

In homeostasis, somatosensory C fibre afferents are hypothesised to mediate input to the brain about interactions with external stimuli and sympathetic efference provides the output that regulates bodily functions. We aimed to test this hypothesis and whether different types of innocuous somatosensory input have differential effects. Healthy volunteers performed a muscle fatigue (hand-grip) task to exhaustion, which produces increased muscle sympathetic nerve activity (MSNA), as measured through microneurography. Participants completed the muscle fatigue task without concurrent cutaneous sensory stimulation (control) or we applied skin warming (heat pack) as a C fibre stimulation, slow brush stroking as C and A beta fibre stimulation, or vibration as A beta fibre stimulation, to the participant's forearm. We also measured heart rate, the duration of the hand-grip task, and ratings of pain at the end of the task. Concurrent skin warming showed increased MSNA compared to the other conditions. Tactile stimuli (brushing, vibration) were not significantly different to the control (no intervention) condition. Warming increased the pain from the muscle contraction, whereas the tactile stimuli did not. We interpret the effect of warming on MSNA as providing relevant afferent information during muscle contraction, which needed to be counteracted via vasoconstriction to maintain homeostasis. Brushing and vibration were less homeostatically relevant stimuli for the muscle contraction and hence had no significant effect. The findings add sensory specificity to our current understanding of homeostatic regulation through somatosensory afferent and sympathetic efferent pathways.

Subject headings

MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin -- Neurologi (hsv//swe)
MEDICAL AND HEALTH SCIENCES -- Clinical Medicine -- Neurology (hsv//eng)
MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin (hsv//swe)
MEDICAL AND HEALTH SCIENCES -- Clinical Medicine (hsv//eng)

Keyword

Homeostasis
MSNA
Touch
Warmth
Vibration
C-fibre
physiological condition
heat-stress
afferents
pain
responses
interoception
modulation
activation
mechanisms
exercise
Neurosciences & Neurology
Homeostasis; MSNA; Touch; Warmth; Vibration; C-fibre

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ref (subject category)
art (subject category)

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By the author/editor: Ackerley, Rochel ...; Sverrisdottir, Y ...; Birklein, F.; Elam, M.; Olausson, Håkan; Kramer, H. H.

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MEDICAL AND HEALTH SCIENCES: MEDICAL AND HEAL ...; and Clinical Medicin ...; and Neurology

MEDICAL AND HEALTH SCIENCES: MEDICAL AND HEAL ...; and Clinical Medicin ...

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By the university: University of Gothenburg; Linköping University

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