Development of individual differences of cardiovascular regulation in the Bailey recombinant inbred mice

Gregory A. Harshfield, Edward C. Simmel

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


Previous research has demonstrated that the cardiovascular system (CVS) is not completely developed in the rat until 20 days of age. Prior to this age the sympathetic nervous system (SNS) is dominant during resting conditions and the stress response is vagally mediated, which is the opposite of most adult rats. In the present research, using the Bailey recombinant inbred strains and their progenitor strains (C57BL/6 By and BALB/cBy), we determined the developmental period for the CVS in mice. The CVS was controlled by a high SNS tone and the stress response was vagally mediated at 8 days of age. By 12 days of age, the mice had much slower baseline heart rates which were vagally controlled. Significant strain differences were also found with a polygenic model accounting for these differences. The stress response of the 12-day-old mice was not interpretable because of individual differences in the adult coping strategies. These differences were accounted for by a different polygenic model than was found in the baseline condition.

Original languageEnglish (US)
Pages (from-to)495-504
Number of pages10
JournalBehavior Genetics
Issue number6
StatePublished - Nov 1 1979
Externally publishedYes


  • BALB/cBy
  • C57BL/6By
  • cardiovascular system
  • heart rate
  • polygenetic inheritance
  • recombinant inbred strains
  • stress

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Genetics
  • Genetics(clinical)


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