- 1918, Arthur F. Hurst, Medical diseases of the war, p285
- Parkinson and Koefod have investigated the immediate effect of smoking five cigarettes in forty minutes on the circulation of forty smokers, of whom thirty were suffering from soldier's heart and ten were healthy soldiers.
- 1920, Austin Flint, A manual of physical diagnosis, p.iv
- The extension of our knowledge in regard to cardiac disorders and arrhythmias was largely incorporated in the seventh edition of this work, but to them has been added the more recent studies upon Effort Syndrome or Soldier's Heart.
Dating to the American Civil War.