Physical exercise at high altitude is associated with a testicular dysfunction leading to reduced sperm concentration but healthy sperm quality  Fiore Pelliccione, M.D., Ph.D., Vittore Verratti, M.D., Anatolia D'Angeli, Ph.D., Alessandro Micillo, M.D., Christian Doria, Ph.D., Alfonso Pezzella, M.D., Giovanni Iacutone, M.D., Felice Francavilla, M.D., Camillo Di Giulio, Ph.D., Sandro Francavilla, M.D.  Fertility and Sterility  Volume 96, Issue 1, Pages 28-33 (July 2011) DOI: 10.1016/j.fertnstert.2011.03.111 Copyright © 2011 American Society for Reproductive Medicine Terms and Conditions

Figure 1 Box and whiskers plots of the reproductive hormones profile. Values are medians (horizontal bars) with 25th and 75th percentiles (boxes); the “whiskers” indicate nonoutlier range. Differences are evaluated with nonparametric Friedman analysis of variance (ANOVA) by ranks. (A) P=.0156 between intermediate (after 22 days of exercise at high altitude) and sea level at baseline (SL-pre), or between intermediate and after 10 days upon reaching sea level (SL-post); (B) P=.0475 for SL-pre and intermediate, P=.0313 for intermediate and SL-post; (C) P=.0156 for SL-pre and intermediate, P=.0313 for intermediate and SL-post; (D) P=.0156 for SL-pre and SL-post, P=.0475 for intermediate and SL-post. Fertility and Sterility 2011 96, 28-33DOI: (10.1016/j.fertnstert.2011.03.111) Copyright © 2011 American Society for Reproductive Medicine Terms and Conditions