title: Erectile dysfunction in cyclists. Is there any difference in penile blood flow during cycling in an upright versus a reclining position?
abstract: OBJECTIVE
  Perineal compression during bicycling appears to be responsible for some cases of erectile dysfunction.
  
  
  METHODS
  In 46 healthy athletic men transcutaneous penile oxygen pressure (tpO(2)) at the glands of the penis was measured, using a transcutaneous measurement device. It has been shown that the tpO(2) levels measured at the glans correlate with the penile blood flow. Our measurements were performed before, during and after cycling in an upright and a reclining position in a crossover study.
  
  
  RESULTS
  The mean transcutaneous pO(2) at the glans in a standing position before biking was 60.5+/-8.1 mm Hg. It decreased after sitting on the saddle in an upright position to 17.9+/-3.9 mm Hg. Continued cycling in a seated upright position showed pO(2) levels of 18.3+/-5.2 mm Hg, with a full return to normal pO(2) values after a 10-min recovery period in a standing position. Cycling in a reclining position resulted in pO(2) levels of 59.4+/-4.2 mm Hg, a similar level to that obtained before exercising.
  
  
  CONCLUSIONS
  The results of the present study demonstrated that there is a deficiency in penile perfusion caused by perineal arterial compression. Cycling in a reclining position - in which no perineal compression was seen - caused no alteration in penile blood flow during exercising. Therefore, we suggest cycling in a reclining position to avoid health hazards - such as penile numbness and hypoxygenation of the corpora cavernosa, which can result in impotency.
authors.affiliation: Department of Urology, University Medical Centre of Cologne, Germany. Frank.Sommer@uni-koeln.de
authors.forename: F
authors.initials: F
authors.lastname: Sommer
authors.forename: U
authors.initials: U
authors.lastname: Schwarzer
authors.forename: T
authors.initials: T
authors.lastname: Klotz
authors.forename: H P
authors.initials: HP
authors.lastname: Caspers
authors.forename: G
authors.initials: G
authors.lastname: Haupt
authors.forename: U
authors.initials: U
authors.lastname: Engelmann
mesh_terms: D000328:Adult; D001642:Bicycling / Q000502:physiology*; D001785:Blood Gas Monitoring, Transcutaneous; D018592:Cross-Over Studies; D007172:Erectile Dysfunction / Q000097:blood / Q000209:etiology / Q000503:physiopathology*; D006801:Humans; D008297:Male; D010100:Oxygen / Q000097:blood; D010413:Penis / Q000098:blood supply* / Q000503:physiopathology*; D011187:Posture / Q000502:physiology*
chemical_list: D010100:Oxygen