Spectral analysis of electroencephalography changes after choking in judo (juji-jime)

Med Sci Sports Exerc. 1998 Sep;30(9):1356-62. doi: 10.1097/00005768-199809000-00003.


Purpose: The present study was carried out to investigate possible electroencephalographic changes induced by choking in judo (shime-waza) by means of spectral analysis and brain mapping.

Methods: Power spectral changes in Electroencephalography (EEG) were recorded in six experienced judoka who underwent a choking trial with a "shime-waza choking" technique called juji-jime.

Results: A significant increase of global field power in the delta- and theta-range occurred, while physiological alpha-power decreased. These changes in the low-frequency range reached a statistically significant level within a time span up to 20 s after choking, which was performed at an average choking time of 8 s. In no case did choking provoke neuropsychological symptoms. Yet, spectral EEG-analysis revealed subclinical changes of brain function.

Conclusions: Choking in judo may induce subclinical electroencephalographic perturbations. The extent and duration can be objectified by means of spectral analysis of EEG data, global field power computation, and brain-mapping representation.

MeSH terms

  • Airway Obstruction / physiopathology*
  • Brain / physiopathology
  • Electroencephalography
  • Humans
  • Hypoxia / physiopathology
  • Male
  • Martial Arts / injuries*
  • Time Factors