title: Arterial and intraocular pressure changes after a single-session hot-water immersion.
abstract: OBJECTIVE
  The aim of this study is to investigate the effect of head-out hot-water immersion on the intraocular pressure (IOP) of healthy subjects and investigate whether this intervention alters cardiovascular and microcirculatory responses. METHODs: 16 male and 18 female healthy young adults were immersed in 39 degrees C water up to shoulder level for 20 minutes. Blood pressure (BP), heart rate (HR) and IOP were measured pre-immersion, post-immersion and five minutes after immersion on the same day. Tono-Pen was used to measure IOP. Mean arterial blood pressure (MAP), systolic pressure rate product (S-PRP), diastolic pressure rate product (D-PRP), pulse pressure (PP), mean ocular perfusion pressure (mean-OPP), systolic ocular perfusion pressure (S-OPP) and diastolic ocular perfusion pressure (D-OPP) were calculated.
  
  
  RESULTS
  Systolic BP (SBP), diastolic BP (DBP), MAP, IOP, S-OPP, D-OPP and mean-OPP decreased; HR increased five minutes after immersion in the pool and post-immersion out of the pool significantly, compared to pre-immersion data (p < 0.05). HR, S-PRP and D-PRP measured five minutes after immersion were significantly higher from post-immersion (p < 0.05). PP and S-OPP were significantly different five minutes after immersion compared to pre-immersion. There was no statistically significant correlation between IOP and SBP, DBP, MAP, S-PRP, D-PRP, PP, S-OPP, D-OPP, or mean-OPP (p > 0.05).
  
  
  CONCLUSIONS
  Physiological hemodynamic response to single head-out hot-water immersion caused a statistically significant decrease in IOP. Preliminary results could help to clarify vascular reactions and IOP changes during hot-water immersion that might be potentially therapeutic in glaucoma patients.
authors.forename: Gulin
authors.initials: G
authors.lastname: Findikoglu
authors.forename: Ebru Nevin
authors.initials: EN
authors.lastname: Cetin
authors.forename: Ayse
authors.initials: A
authors.lastname: Sarsan
authors.forename: Hande
authors.initials: H
authors.lastname: Senol
authors.forename: Cem
authors.initials: C
authors.lastname: Yildirim
authors.forename: Fusun
authors.initials: F
authors.lastname: Ardic
mesh_terms: D001158:Arteries / Q000502:physiology; D001794:Blood Pressure / Q000502:physiology*; D005260:Female; D006257:Head; D064368:Healthy Volunteers; D006339:Heart Rate / Q000502:physiology*; D006358:Hot Temperature; D006801:Humans; D007101:Immersion / Q000503:physiopathology*; D007429:Intraocular Pressure / Q000502:physiology*; D008297:Male; D008833:Microcirculation / Q000502:physiology; D012737:Sex Factors; D013997:Time Factors; D014065:Tonometry, Ocular; D055815:Young Adult