title: Vision Loss by Central Retinal Vein Occlusion After Kaatsu Training: A Case Report.
abstract: Kaatsu training is an exercise method involving the application of pressure to the target muscle, and is being increasingly used in rehabilitation programs for heart disease patients in some hospitals. This method restricts blood flow to the muscles during exercise, and the resultant hypoxia effectively causes muscle hypertrophy and strengthening. However, no medical guidelines or risk factors for its use have been established.We report a case involving a 45-year-old man who suffered from 2 episodes of central retinal vein occlusion (CRVO), both occurring on the day following a Kaatsu training session.As a characteristic of the CRVO and its subsequent complications, the affected eye lost vision despite treatment. The patient had a history of hypertension and diabetes, and thus was at an increased risk of CRVO. Kaatsu training, which changes the heart rate and serum growth hormone levels, may have triggered the onset of CRVO.This case highlights that underlying medical conditions such as hypertension, diabetes, and the consequent inflammation, could be risk factors for vascular side effects resulting from Kaatsu training. Further studies are required before the medical and recreational use of Kaatsu training become widespread.
authors.affiliation: From the Laboratory of Retinal Cell Biology (YO); Department of Ophthalmology, Keio University, School of Medicine, Shinjuku-ku (YO, TK, HS, KT), and Kyorin Eye Center, Kyorin University School of Medicine, Mitaka-shi, Tokyo Japan (TK).
authors.forename: Yoko
authors.initials: Y
authors.lastname: Ozawa
authors.forename: Takashi
authors.initials: T
authors.lastname: Koto
authors.forename: Hajime
authors.initials: H
authors.lastname: Shinoda
authors.forename: Kazuo
authors.initials: K
authors.lastname: Tsubota
mesh_terms: D003930:Diabetic Retinopathy / Q000150:complications*; D005938:Glucocorticoids / Q000008:administration & dosage*; D006801:Humans; D056965:Injections, Intraocular; D008028:Light Coagulation / Q000379:methods; D008297:Male; D008875:Middle Aged; D009798:Ocular Hypertension / Q000175:diagnosis / Q000209:etiology / Q000503:physiopathology / Q000601:surgery; D012008:Recurrence; D055070:Resistance Training / Q000009:adverse effects*; D012170:Retinal Vein Occlusion / Q000150:complications / Q000175:diagnosis / Q000209:etiology / Q000503:physiopathology / Q000628:therapy; D014130:Trabeculectomy / Q000379:methods*; D016896:Treatment Outcome; D014786:Vision Disorders / Q000175:diagnosis / Q000209:etiology / Q000628:therapy; D014792:Visual Acuity
chemical_list: D005938:Glucocorticoids