title: The effect of physical fitness on intraocular pressure in Chinese medical students.
abstract: BACKGROUND
  Virtually all the tissues and systems of the human body have been shown to be responsive to programs of exercise. Regarding the relationship between physical fitness and intraocular pressure (IOP), the existing literature is controversial with some associations inconsistent. In one study, IOP values were not dependent upon changes in physical fitness. In contrast to this, another study demonstrated that physical fitness significantly reduces intraocular pressure levels. In recent years it has been noted that intraocular pressure is a dynamic function and is subject to many influences both acutely and over the long term. The variety of results of previous studies may have come from several factors which can affect intraocular pressure. The present study was planned to investigate the effects of physical fitness on intraocular pressure in Chinese medical studies, after elimination of other affecting factors.
  
  
  METHODS
  Forty medical students were categorized into control and experimental groups, each consisting of 20 subjects. The experimental group took a supervised exercise program for 10 weeks. Physical fitness was evaluated by measurement of maximum oxygen uptake with a Beckman O2 analyzer. Intraocular pressure was measured with the Goldmann applanation tonometer.
  
  
  RESULTS
  After exercise training, the experimental group showed a marked increase in physical fitness. The difference of IOP between the control and experimental groups before exercise conditioning was 0.3 +/- 0.1 mmHg (P > 0.05). After 10 weeks, this difference increased to 1.1 +/- 0.4 mmHg (p < 0.05).
  
  
  CONCLUSIONS
  This study concludes that physical fitness reduces intraocular pressure. Whether exercise conditioning has a role as a nonpharmacologic approach or as an addition to medical therapy must be left to future investigations.
authors.affiliation: Department of Physiology, Rawalpindi Medical College, Rawalpindi, Pakistan.
authors.forename: I A
authors.initials: IA
authors.lastname: Qureshi
authors.forename: X R
authors.initials: XR
authors.lastname: Xi
authors.forename: X D
authors.initials: XD
authors.lastname: Wu
authors.forename: J
authors.initials: J
authors.lastname: Zhang
authors.forename: E
authors.initials: E
authors.lastname: Shiarkar
mesh_terms: D000328:Adult; D001794:Blood Pressure / Q000502:physiology; D002681:China; D006801:Humans; D007429:Intraocular Pressure; D008297:Male; D010101:Oxygen Consumption / Q000502:physiology; D010809:Physical Fitness; D014065:Tonometry, Ocular