@misc{indiciae4885f588c931,
  title = {Heart rate variability and circulating catecholamine concentrations during steady state exercise in healthy volunteers.},
  author = {H W Breuer and A Skyschally and R Schulz and C Martin and M Wehr and G Heusch},
  year = {1993},
  doi = {10.1136/hrt.70.2.144},
  url = {https://pubmed.ncbi.nlm.nih.gov/8038025/},
  note = {Source identifier: 8038025}
}