Effects of static and rhythmic twitch contractions on the discharge of group III and IV muscle afferents

Marc P Kaufman, Tony G. Waldrop, Kenneth J. Rybicki, George A. Ordway, Jere H. Mitchell

Research output: Contribution to journalReview article

121 Citations (Scopus)

Abstract

Summary: Although both static and rhythmic twitch contractions of the hindlimb muscles of anaesthetised cats have been shown to reflexly evoke pressor responses, the increase in arterial pressure evoked by the former type of contraction has been shown to be substantially larger than that evoked by the latter. We have therefore recorded the impulse activity of single group III and IV muscle afferents, whose activation reflexly increases arterial pressure, while we both statically and rhythmically twitch-contracted the triceps surae muscles of anaesthetised cats. We found that group III afferents (n=17) discharged significantly more impulses in response to static contraction than in response to rhythmic contraction. By contrast, group IV afferents (n=18) fired approximately the same number of impulses in response to the two types of contraction. In addition, we found that many of the group III but only a few of the group IV afferents displayed discharge properties suggestive that these afferents were mechanoreceptors. We conclude that the discharge of group III afferents are likely to be responsible for the difference in the magnitudes of the reflex pressor responses evoked by static and rhythmic contraction.

Original languageEnglish (US)
Pages (from-to)663-668
Number of pages6
JournalCardiovascular Research
Volume18
Issue number11
DOIs
StatePublished - Jan 1 1984
Externally publishedYes

Fingerprint

Arterial Pressure
Cats
Muscles
Mechanoreceptors
Hindlimb
Muscle Contraction
Reflex

Keywords

  • Cats
  • Exercise
  • Mechanoreceptors
  • Somato-sympathetic reflexes
  • Thin-fibre muscle afferents

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

Cite this

Effects of static and rhythmic twitch contractions on the discharge of group III and IV muscle afferents. / Kaufman, Marc P; Waldrop, Tony G.; Rybicki, Kenneth J.; Ordway, George A.; Mitchell, Jere H.

In: Cardiovascular Research, Vol. 18, No. 11, 01.01.1984, p. 663-668.

Research output: Contribution to journalReview article

Kaufman, Marc P ; Waldrop, Tony G. ; Rybicki, Kenneth J. ; Ordway, George A. ; Mitchell, Jere H. / Effects of static and rhythmic twitch contractions on the discharge of group III and IV muscle afferents. In: Cardiovascular Research. 1984 ; Vol. 18, No. 11. pp. 663-668.
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AB - Summary: Although both static and rhythmic twitch contractions of the hindlimb muscles of anaesthetised cats have been shown to reflexly evoke pressor responses, the increase in arterial pressure evoked by the former type of contraction has been shown to be substantially larger than that evoked by the latter. We have therefore recorded the impulse activity of single group III and IV muscle afferents, whose activation reflexly increases arterial pressure, while we both statically and rhythmically twitch-contracted the triceps surae muscles of anaesthetised cats. We found that group III afferents (n=17) discharged significantly more impulses in response to static contraction than in response to rhythmic contraction. By contrast, group IV afferents (n=18) fired approximately the same number of impulses in response to the two types of contraction. In addition, we found that many of the group III but only a few of the group IV afferents displayed discharge properties suggestive that these afferents were mechanoreceptors. We conclude that the discharge of group III afferents are likely to be responsible for the difference in the magnitudes of the reflex pressor responses evoked by static and rhythmic contraction.

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