Genetic variation in alpha2-adrenoreceptors and heart rate recovery after exercise

Utkarsh Kohli, André Diedrich, Prince J. Kannankeri, Mordechai Muszkat, Gbenga G. Sofowora, Maureen K. Hahn, Brett A. English, Randy D. Blakely, C. Michael Stein, Daniel Kurnik*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Heart rate recovery (HRR) after exercise is an independent predictor of adverse cardiovascular outcomes. HRR is mediated by both parasympathetic reactivation and sympathetic withdrawal and is highly heritable. We examined whether common genetic variants in adrenergic and cholinergic receptors and transporters affect HRR. In our study 126 healthy subjects (66 Caucasians, 56 African Americans) performed an 8 min step-wise bicycle exercise test with continuous computerized ECG recordings. We fitted an exponential curve to the postexercise R-R intervals for each subject to calculate the recovery constant (kr) as primary outcome. Secondary outcome was the root mean square residuals averaged over 1 min (RMS1min), a marker of parasympathetic tone. We used multiple linear regressions to determine the effect of functional candidate genetic variants in autonomic pathways (6 ADRA2A, 1 ADRA2B, 4 ADRA2C, 2 ADRB1, 3 ADRB2, 2 NET, 2 CHT, and 1 GRK5) on the outcomes before and after adjustment for potential confounders. Recovery constant was lower (indicating slower HRR) in ADRA2B 301–303 deletion carriers (n = 54, P = 0.01), explaining 3.6% of the interindividual variability in HRR. ADRA2A Asn251Lys, ADRA2C rs13118771, and ADRB1 Ser49Gly genotypes were associated with RMS1min. Genetic variability in adrenergic receptors may be associated with HRR after exercise. However, most of the interindividual variability in HRR remained unexplained by the variants examined. Noncandidate gene-driven approaches to study genetic contributions to HRR in larger cohorts will be of interest.

Original languageAmerican English
Pages (from-to)400-406
Number of pages7
JournalPhysiological Genomics
Volume47
Issue number9
DOIs
StatePublished - 1 Sep 2015
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2015 the American Physiological Society.

Keywords

  • Adrenergic
  • Cholinergic
  • Heart rate recovery
  • Parasympathetic tone
  • Polymorphisms

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