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Home / Equine Research Bank / J Equine Sci / History of research in Japan on electrocardiography in the r...
Journal of equine science2015; 26(1); 1-13; doi: 10.1294/jes.26.1

History of research in Japan on electrocardiography in the racehorse.

Abstract: Since the first recording of electrocardiograms (ECGs) of a horse in Japan was carried out in 1944, studies on ECGs have been performed intensively. During the early stages of research from the 1950s to 1960s, leads to use for ECG recording were evaluated using several different approaches including unipolar leads, bipolar limb leads, and bipolar chest leads. Based on these studies, the AB lead, which is oriented along the long axis of the heart, became the standard reference method in Japan. Electrodes of the AB lead are placed on the upper 1/4th point along a straight line between the withers and the left shoulder blade (base: B), and 10 cm posterior to the left olecranon (apex: A). The incidence of equine arrhythmias among racehorses has been surveyed, and details of the electrocardiographic characteristics of several arrhythmias have been investigated. In particular, atrial fibrillation (AF) has been extensively studied, and papers have reported findings such as that paroxysmal AF occurs during racing and described electrocardiographic changes that occur at the onset of AF during exercise. Development of a radiotelemetry system for ECG recording enabled the first recording of equine ECGs during galloping in 1964, the detection of arrhythmias, and calculation of heart rate during exercise. Studies on comparative and developmental changes of ECGs have described characteristics of the equine ECGs. Future research on changes in cardiac function, including autonomic function, that occur with aging may lead to new developments in equine electrocardiography and contribute to improving the health and welfare of the horse.
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Publication Date: 2015-03-31 PubMed ID: 25829865PubMed Central: PMC4379327DOI: 10.1294/jes.26.1Google Scholar: Lookup
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Summary

This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.

The research article discusses the history and developments made in the field of equine electrocardiography (ECG) in Japan since its first recording in 1944, focusing on techniques, findings, advancements, and prospects for future research.

Initial Developments in Equine ECG

  • Equine electrocardiography began in Japan in 1944.
  • From the 1950s to the 1960s, early-stage research was conducted to determine the most efficient leads for ECG recording.
  • Different lead approach methods, including unipolar leads, bipolar limb leads, and bipolar chest leads were evaluated.
  • Research led to the establishment of the AB lead as the standard reference method in Japan. The AB lead is oriented along the long axis of the horse’s heart, with the electrodes placed at specific points on the horse’s body.

Research and Findings on Equine Arrhythmias

  • The research also studied the incidence of equine arrhythmias among racehorses.
  • The electrocardiographic characteristics of several arrhythmias were examined and documented.
  • Particular attention was given to atrial fibrillation (AF), a common cardiac arrhythmia in horses.
  • Studies reported findings like the occurrence of paroxymal AF during horse racing, and also described the changes in the ECG at the onset of AF during exercise.

Progress in Technology and New Insights

  • Developments in radiotelemetry systems facilitated the first ECG recordings in galloping horses in 1964, enabling the detection of arrhythmias and calculation of heart rate during exercise.
  • Studies detailed the comparative and developmental changes observed in equine ECGs, contributing to the understanding of equine cardiac function.

Future Research Directions

  • The research underscores the need for further studies on how aging influences cardiac and autonomic functions in horses.
  • Such studies could facilitate progress in equine electrocardiography and thereby contribute to improving the health and welfare of horses.

Cite This Article

APA
Hiraga A, Sugano S. (2015). History of research in Japan on electrocardiography in the racehorse. J Equine Sci, 26(1), 1-13. https://doi.org/10.1294/jes.26.1

Publication

Journal of equine science
ISSN: 1340-3516
NlmUniqueID: 9503751
Country: Japan
Language: English
Volume: 26
Issue: 1
Pages: 1-13

Researcher Affiliations

Hiraga, Atsushi
  • Equine Research Institute of The Japan Racing Association, Tochigi 329-0412, Japan.
Sugano, Shigeru
  • Professor Emeritus, The University of Tokyo, Tokyo 181-0001, Japan.

References

This article includes 84 references
  1. Amada A, Senta T. Studies on electrocardiogram in racehorses. 1. Lead methods for detecting arrhythmias.. Exp. Rep. Equine Hlth. Lab. 1964a 2: 1–8[in Japanese].
  2. Amada A, Senta T. Studies on electrocardiogram in racehorses. 2. Electrocardiographic observation of arrhythmias.. Exp. Rep. Equine Hlth. Lab. 1964b 2: 9–27[in Japanese].
  3. Amada A, Senta T, Senoo T. Defibrillation of atrial fibrillation by quinidine sulfate.. Exp. Rep. Equine Hlth. Lab. 1965 3: 1–11[in Japanese].
  4. Amada A, Senta T. Electrocardiographic observation of arrhythmias in racehorses.. Adv. Anim. Electrocardiography 1968 1: 5–6[in Japanese].
  5. Amada A, Kiryu K, Ohishi S. A case report of atrial fibrillation in a horse.. Adv. Anim. Electrocardiography 1968 1: 46.[in Japanese].
  6. Amada A, Kaneko T. Ventricular parasystole in a racing Thoroughbred; a case report.. Exp. Rep. Equine Hlth. Lab. 1970 7: 81–93.
  7. Amada A. A portable electrocardiograph with a magnetic tape recording system for the horse during exercise.. Adv. Anim. Electrocardiography 1974 7: 28–34[in Japanese with English figures and tables].
  8. Amada A, Senta T, Kubo K, Ohishi S, Kiryu K. Atrial fibrillation in the horse: Clinical and histopathological studies of two cases. I. Clinical study.. Exp. Rep. Equine Hlth. Lab. 1974 11: 51–69.
  9. Amada A, Kurita H. Five cases of paroxysmal atrial fibrillation in the racehorse.. Exp. Rep. Equine Hlth. Lab. 1975 12: 89–100.
  10. Amada A, Kurita H. A case of premature atrial contractions in a horse.. Adv. Anim. Electrocardiography 1976 9: 18–27[in Japanese with English figures and tables].
  11. Amada A. History of research on lead methods of electrocardiogram in the horse.. Adv. Anim. Electrocardiography 1977 10: 19–27[in Japanese].
  12. Amada A, Kurita H. Treatment of atrial fibrillation with quinidine sulfate in the racehorse.. Exp. Rep. Equine Hlth. Lab. 1978 15: 46–61.
  13. Amada A, Koike N. Specially made transmitter for recording of exercise electrocardiograms in the racehorse by radiotelemetry.. Bull. Equine Res. Inst. 1980 17: 32–38.
  14. Amada A. A case report of paroxysmal atrial tachycardia with block in a horse.. Adv. Anim. Electrocardiography 1980 13: 66–67[in Japanese].
  15. Amada A. Exercise electrocardiography in horses: exercise-induced arrhythmias in Thoroughbred racehorses.. Jpn. J. Electrocardiol. 2000 20:(Suppl. 1): 59–63[in Japanese].
  16. Banister E.W., Purvis A.D.. Exercise electrocardiography in the horse by radiotelemetry.. J. Am. Vet. Med. Assoc. 1968 152: 1004–1008.
    pubmed: 5689155
  17. Broojiman A.W.S.. Standardization of leads in veterinary clinical electrocardiography.. Tijdschr. Diergeneeskd. 1954 79: 801–811.
  18. Detweiler D.K.. Electrocardiogram of horses.. Fed. Proc. 1952 11: 34.
  19. Detweiler D.K.. Examination on equine heart.. Univ. Penn. Bull. Vet. Ext. Q. 1958 152: 119–129.
  20. Hatazoe T, Kubota C, Fujiki M, Misumi K. Mating behavior increases workload of the heart in Thoroughbred stallions.. J. Vet. Med. Sci. 2012 74: 423–428.
    pubmed: 22123303
  21. Hatazoe T, Nakanishi S, Kimura Y, Misumi K. Causes of death in Japanese Thoroughbred stallion.. J. Jpn. Vet. Med. Assoc. 2012 65: 511–515[in Japanese with English summary].
  22. Hiraga A, Kubo K. Two cases of paroxysmal atrial fibrillation during exercise in horses.. Equine Vet. Edu. 1999 11: 6–10.
  23. Holmes J.R., Alps B.J., Darke P.G.. A method of radiotelemetry in equine electrocardiography.. Vet. Rec. 1966 79: 90–94.
    pubmed: 5968146
  24. Iida M, Tada H, Ueda Y, Sugai S, Furukawa Y, Senta T, Kubo K. Quinidine therapy of atrial fibrillation in a horse.. Adv. Anim. Electrocardiography 1973 6: 44–50[in Japanese with English figures and tables].
  25. Kahn R.H.. Das Pferde-Ekg.. Pflug. Arch. Ges. Physiol. 1913 154: 1–5.
  26. Kato T, Ohmura H, Hiraga A, Wada S, Kuwahara M, Tsubone H. Changes in heart rate variability in horses during immersion in warm springwater.. Am. J. Vet. Res. 2003 64: 1482–1485.
    pubmed: 14672424
  27. Kiryu K, Machida N, Kashida Y, Yoshihara T, Amada A, Yamamoto T. Pathologic and electrocardiographic findings in sudden cardiac death in racehorses.. J. Vet. Med. Sci. 1999 61: 921–928.
    pubmed: 10487232
  28. Kubo K. Inspection equipments for circulatory function: electrocardiograph and phonocardiograph for horse.. Adv. Anim. Electrocardiography 1981 14: 8–11[in Japanese].
  29. Kusachi R.. Fundamental studies on electrocardiograms of the horse. I. Unipolar semidirect lead.. Jpn. J. Vet. Res. 1955 3: 120–135.
  30. Kusachi R, Sato H. Fundamental studies on electrocardiograms of the horse. II. Bipolar lead.. Jpn. J. Vet. Res. 1955 3: 195–208.
  31. Kusachi R.. Basis of electrocardiography (I).. J. Jap. Vet. Med. Assoc. 1959 12: 553–558[in Japanese].
  32. Kusachi R.. Basis of electrocardiography (II).. J. Jap. Vet. Med. Assoc. 1960 13: 30–34[in Japanese].
  33. Kuwahara M, Hashimoto S, Ishii K, Yagi Y, Hada T, Hiraga A, Kai M, Kubo K, Oki H, Tsubone H, Sugano S. Assessment of autonomic nervous function by power spectral analysis of heart rate variability in the horse.. J. Auton. Nerv. Syst. 1996 60: 43–48.
    pubmed: 8884694
  34. Kuwahara M, Hiraga A, Nishimura T, Tsubone H, Sugano S. Electrocardiogram from longest-living racehorse in Japan: legendary racehorse Shinzan.. J. Equine Sci. 1997 8: 39–42.
  35. Kuwahara M, Hiraga A, Kai M, Tsubone H, Sugano S. Influence of training on autonomic nervous function in horses: evaluation by power spectral analysis of heart rate variability.. Equine Vet. J. Suppl. 1999 30: 178–180.
    pubmed: 10659247
  36. Machida N, Yasuda J, Too K. Three cases of paroxysmal atrial fibrillation in the Thoroughbred newborn foal.. Equine Vet. J. 1989 21: 66–68.
    pubmed: 2920703
  37. Matsuba S, Shimamura T. Studies on exercise physiology and performance test of the racehorse.. Teikoku Keiba Kyoukai (Imperial Racing Association) .
  38. Matsubara T, Inamasu K, Yamashita Y. An equine case of atrial fibrillation treated with quinidine sulfate.. Adv. Anim. Electrocardiography 1978 11: 32–36[in Japanese with English figures, tables and summary].
  39. Matsui K, Amada A, Sawazaki T, Kano Y. Changes in electrocardiographic parameters with growth in Thoroughbred horses and Shetland ponies.. Bull. Equine Res. Inst. 1983 20: 77–86.
  40. Matsui K, Sugano S, Masuyama I, Amada A, Kano Y. Alterations in the heart rate of Thoroughbred horse, pony and Holstein cow through pre- and post-natal stages.. Nihon Juigaku Zasshi (Jpn. J. Vet. Sci.) 1984 46: 505–510.
    pubmed: 6492540
  41. Matsui K, Amada A, Sawazaki H. Second-degree atrioventricular block observed in a Thoroughbred foal on 2.5 months of age.. Nihon Juigaku Zasshi (Jpn. J. Vet. Sci.) 1985 47: 175–178.
    pubmed: 3981839
  42. Matsui K, Sugano S, Masuyama I. Changes in the fetal heart rate of thoroughbred horse through the gestation.. Nihon Juigaku Zasshi (Jpn. J. Vet. Sci.) 1985 47: 597–601.
    pubmed: 4046265
  43. Matsui K. Fetal and maternal heart rates in a case of twin pregnancy of the Thoroughbred horse.. Nihon Juigaku Zasshi (Jpn. J. Vet. Sci.) 1985 47: 817–821.
    pubmed: 4068443
  44. Matsui K, Sugano S, Amada A. Heart rate and ECG response to twitching in Thoroughbred foals and mares.. Nihon Juigaku Zasshi (Jpn. J. Vet. Sci.) 1986 48: 305–312.
    pubmed: 3712891
  45. Matsui K, Sugano S. Species differences in the changes in heart rate and T-wave amplitude after autonomic blockade in Thoroughbred horses, ponies, cows, pigs, goats and chickens.. Nihon Juigaku Zasshi (Jpn. J. Vet. Sci.) 1987 49: 637–644.
    pubmed: 3626243
  46. Matsui K, Sugano S. Relation of intrinsic heart rate and autonomic nervous tone to resting heart rate in the young and the adult of various domestic animals.. Nihon Juigaku Zasshi (Jpn. J. Vet. Sci.) 1989 51: 29–34.
    pubmed: 2927036
  47. Nakamura R, Too K, Matsuhashi A. Studies on the applications of electrocardiogram in horses. I. The lead method and electrocardiogram with special reference to configurations and measurements of waves in the limb lead.. Jpn. J. Vet. Res. 1955a 3: 24–32.
  48. Nakamura R, Too K, Matsuhashi A. Studies on the applications of electrocardiogram in horses. II. The lead method and electrocardiogram with special reference to configurations and measurements of waves in two bipolar chest lead.. Jpn. J. Vet. Res. 1955b 3: 171–181.
  49. Nakamura R, Too K, Matsuhashi A. Studies on the applications of electrocardiogram in horses. III. The lead method and electrocardiogram with special reference to configurations and measurements of waves in semi-unipolar chest lead.. Jpn. J. Vet. Res. 1956 4: 33–43.
  50. Nakamura R. Lead methods of electrocardiogram in domestic animals.. Adv. Anim. Electrocardiography 1968 1: 14–22[in Japanese].
  51. Nakamura R. History of the Japanese Association of Animal Electrocardiography.. Adv. Anim. Electrocardiography 1983 16: 1–20[in Japanese].
  52. Neumann-Kleinpaul K, Steffan H. Der III ableitungsort des elektrokardiograms beimPferde.. Arch. Wiss. Prakt. Tierheilk. 1935 69: 401–409.
  53. Nomura S, Tominaga S. Studies on cardiac function of the horse by using electrocardiograph. 1. Changes in heart beat intervals during walk on a treadmill.. Chosa Kenkyu Hokoku (Research Report). Equine Health Laboratory 1960 7: 73–81[in Japanese].
  54. Nomura S, Senoo T, Amada A, Senta T, Sawazaki H, Ibaraki T. Radiotelemetric studies on electrocardiograms in horses and riders. 1. Performance of radiotelemeter.. Exp. Rep. Equine Hlth. Lab. 1964a 2: 29–47[in Japanese].
  55. Nomura S, Senoo T, Amada A, Senta T, Sawazaki H, Ibaraki T. Radiotelemetric studies on electrocardiograms in horses and riders. 2. Changes of electrocardiograms, heart rate, and heart beat intervals during exercise.. Exp. Rep. Equine Hlth. Lab. 1964b 2: 49–65[in Japanese].
  56. Nomura S. New approaches for evaluating performance of draft horses by using heart beat. Series of equestrian affairs 9.. Japan Equine Affairs Association .
  57. Nomura S. Adaptation of radiotelemetry to equestrian games and horse racing.. Nihon Juigaku Zasshi (Jpn. J. Vet. Sci.) 1966 28: 191–203.
    pubmed: 6005886
  58. Norr J.. Das elektrokardiogramm des Pferde. Seine aufnahme und form.. Z. Biol. 1913 61: 127–229.
  59. Ohmura H, Hiraga A, Aida H, Kuwahara M, Tsubone H. Effects of repeated atropine injection on heart rate variability in Thoroughbred horses.. J. Vet. Med. Sci. 2001 63: 1359–1360.
    pubmed: 11789620
  60. Ohmura H, Hiraga A, Aida H, Kuwahara M, Tsubone H. Effects of initial handling and training on autonomic nervous function in young Thoroughbreds.. Am. J. Vet. Res. 2002 63: 1488–1491.
    pubmed: 12428655
  61. Ohmura H, Hiraga A, Aida H, Kuwahara M, Tsubone H. Influence of quinidine and flecainide on autonomic nervous activity in Thoroughbred horses.. Vet. Rec. 2003 152: 114–116.
    pubmed: 12572942
  62. Ohmura H, Hiraga A, Aida H, Kuwahara M, Tsubone H, Jones J.H.. Changes in heart rate and heart rate variability in Thoroughbreds during prolonged road transportation.. Am. J. Vet. Res. 2006 67: 455–462.
    pubmed: 16506907
  63. Okajima M. The Japanese Society of Comparative Electrocardiography; Records of Ancient Matters.. The 30 anniversary of foundation of Japanese Society of Comparative Electrocardiography 2005 2–21.
  64. Sawazaki H. History of research in Japan on electrocardiography in domestic animals.. Adv. Anim. Electrocardiography 1972 5: 1–14[in Japanese].
  65. Sawazaki H. On the publication of the 10th Advances in Animal Electrocardiography.. Adv. Anim. Electrocardiography 1977 10: 1–7[in Japanese].
  66. Senta T, Nomura S. Studies on sequential of R wave of electrocardiogram in horses.. Chosa Kenkyu Hokoku (Research Report). Equine Health Laboratory 1960 7: 46–63 [in Japanese].
  67. Senta T, Nomura S. Diurnal variations in heart rate and sequential of R wave.. Exp. Rep. Equine Hlth. Lab. 1961 1: 1–11[in Japanese].
  68. Senta T, Amada A. A case of WPW syndrome in a racehorse.. Exp. Rep. Equine Hlth. Lab. 1967 4: 129–136[in Japanese].
  69. Senta T, Amada A, Hirano Y. A case report on atrial return extrasystole (atrial echo) in the Thoroughbred.. Exp. Rep. Equine Hlth. Lab. 1970 7: 75–83.
  70. Senta T, Amada A, Kubo K, Kiryu K, Watanabe O. A case of paroxysmal ventricular tachycardia in the Thoroughbred.. Adv. Anim. Electrocardiography 1970 3: 19–24[in Japanese with English figures].
  71. Senta T, Smetzer D.L., Smith C.R.. Effects of exercise on certain electrocardiographic parameters and cardiac arrhythmias in the horse. A radiotelemetric study.. Cornell Vet. 1970 60: 552–569.
    pubmed: 5481578
  72. Senta T, Kubo K, Kiryu K, Amada A, Watanabe O, Taya Y. A case report on ventricular paroxysmal tachycardia (permanent type) in a Thoroughbred colt.. Exp. Rep. Equine Hlth. Lab. 1971 8: 61–71.
  73. Senta T, Kubo K, Sugimoto O, Amada A. Induction of atrial fibrillation by stimulation in the horse (preliminary note).. Exp. Rep. Equine Hlth. Lab. 1975 12: 109–112.
  74. Senta T, Kubo A. Experimental induction of atrial fibrillation by electrical stimulation in the horse.. Exp. Rep. Equine Hlth. Lab. 1978 15: 37–46.
  75. Steel J.D.. The electrocardiogram of racehorses: a preliminary communication.. Med. J. Aust. 1957 44: 78–79.
    pubmed: 13399527
  76. Sugeno H, Nishikawa H, Yasuda S. A case of atrial fibrillation in a horse.. Adv. Animal. Electrocardiography 1968 1: 29.[in Japanese].
  77. Tatsumi H, Kato M, Chiba H, Okabe T. Significance of pulse rate as an index of workload.. Nogiken-Hokoku. G 1959 17: 59–66.
  78. Too K, Matsuhashi H, Nakamura R. Electrocardiographic observations of equine arrhythmia in a horse.. J. Jap. Vet. Med. Assoc. 1955a 8: 516–518[in Japanese].
  79. Too K, Matsuhashi H, Nakamura R. Electrocardiographic observations of ventricular premature contraction in a horse.. J. Jap. Vet. Med. Associ. 1955b 8: 562–563[in Japanese].
  80. Too K. Abnormal electrocardiograms in the horse.. Jpn. J. Vet. Res. 1960 8: 1–4.
  81. Too K. A case of atrial fibrillation in the Percheron.. Adv. Anim. Electrocardiography 1970 3: 13–18[in Japanese with English figures and tables].
  82. Too K, Kanagawa H, Ishikawa T. Radiotelemetry of electrocardiogram during copulation in animals. I. Observations on Percheron and Thoroughbred stallions.. Adv. Anim. Electrocardiography 1973 6: 9–16[in Japanese with English figures and summary].
  83. Uesaka S. Electrocardiogram of Japanese cattle and effect of grazing on electrocardiogram.. Nihon Chikusan Gakkaiho 1943 15: 177–188[in Japanese].
  84. Yasuda S, Nitahara H, Ogihara N. Studies on electrocardiography of the warhorse.. Sogo Juigaku Zasshi (J. Jpn. Vet. Med. Assoc.) 1944 1: 57–65, 109–117 [in Japanese].
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