European Journal of Applied Physiology

, Volume 118, Issue 6, pp 1289–1290 | Cite as

Authors’ reply to Medeiros et al.: Make it easier! Evaluation of the ‘vagal-sympathetic effect’ in different conditions with R–R intervals monitoring

  • Michael R. Esco
  • Henry N. Williford
  • Andrew A. Flatt
  • Todd Freeborn
  • Fabio Y. Nakamura
  • Michael V. Fedewa


Heart rate variability RMSSD Time-domain Cardiovascular-autonomic control Athlete monitoring 



Heart rate variability


Low frequency power


Low frequency to high frequency ratio


Root mean square of successive normal-to-normal interval differences


Standard deviation of normal-to-normal R–R intervals


The ratio between standard deviation of normal-to-normal R–R intervals to root mean square of successive normal-to-normal interval differences


Author contributions

MRE and MVF wrote the response letter. All other authors were involved in the original publication. All authors read and approved of the response letter.


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Exercise Physiology Laboratory, Department of KinesiologyUniversity of AlabamaTuscaloosaUSA
  2. 2.Department of KinesiologyAuburn University MontgomeryMontgomeryUSA
  3. 3.Biodynamics Laboratory, Department of Health SciencesArmstrong State UniversitySavannahUSA
  4. 4.Department of Electrical and Computer EngineeringUniversity of AlabamaTuscaloosaUSA
  5. 5.Department of Medicine and Aging Sciences“G. d’Annunzio” University of Chieti-PescaraChietiItaly
  6. 6.The College of Healthcare SciencesJames Cook UniversityQueenslandAustralia

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