@misc{indiciae7090a1714609,
  title = {Heart rate in middle-aged men.},
  author = {J F Richardson},
  year = {1971},
  doi = {10.1093/ajcn/24.12.1476},
  url = {https://pubmed.ncbi.nlm.nih.gov/5118022/},
  note = {Source identifier: 5118022}
}