Browsing by Author "Van der Horst, Gerhard"

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    Male reproductive health statement (XIIIth international symposium on Spermatology, may 9th–12th 2018, Stockholm, Sweden
    (BMC (part of Springer Nature), 2018-10-29) Levine, Hagai; Mohri, Hideo; Ekbom, Anders; Ramos, Liliana; Parker, Geoff; Roldan, Eduardo; Jovine, Luca; Koelle, Sabine; Lindstrand, Anna; Immler, Simone; Mortimer, Sharon; Mortimer, David; Van der Horst, Gerhard; Ishijima, Sumio; Aneck-Hahn, Natalie; Baldi, Elisabetta; Menkveld, Roelof; Rothmann, Susan A.; Giwercman, Aleksander; Giwercman, Yvonne; Holmberg, Mats; Kvist, Ulrik; Bjorndahl, Lars; Holmberg, Rebecka; Arver, Stefan; Flanagan, John; Drevet, Joel R.
    On the occasion of the XIIIth International Symposium on Spermatology held from 9 to 13 May 2018 in Stockholm (Sweden), participants (guest speakers and audience) collectively felt the need to make a public statement on the general issue of male reproductive health. Our intention is to raise awareness of what we believe is a neglected area of research despite alarming situations around the world. The disclosure strategy desired by the co-authors is to bring it to the attention of the greatest number partly by considering co-publication in the various periodicals dealing with Reproductive Biology and Andrology. BaCA’s editorial office accepted this mission and found it natural that our periodical, the official journal of the French Andrology Society (SALF), should carry this message.
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    Revisiting the relationship between the ejaculatory abstinence period and semen characteristics
    (Royan Institute, 2018) Ayad, Bashir M.; Van der Horst, Gerhard; Du Plessis, Stefan S.
    ENGLISH ABSTRACT: Variation in the ejaculatory abstinence period suggested by different guidance bodies have resulted in a growing concern among researchers and clinicians over what the precise period of ejaculatory abstinence ought to be for an optimal semen sample. Several studies have thus been undertaken to examine the association between the length of sexual abstinence and semen characteristics. Not all studies, however, have arrived at the same conclusions. This study aims to review all existing literature published during the past few decades pertaining to the influence of ejaculatory abstinence on semen quality. For the purpose of this systematic review, all data related to sexual abstinence duration and seminal parameters were re-analysed to homogenize the current data. Thorough PubMed, MEDLINE and Google Scholar, a literature search was conducted using the keywords “sexual abstinence”, “ejaculatory abstinence”, “semen”, “spermatozoa”, “semen analysis”, “sperm parameters”, “motility”, “reactive oxygen species (ROS)” and “DNA fragmentation”. After carefully reviewing all the literature, 30 relevant papers, both written in English and published between January 1979 and December 2016, were included in this review. The weight of the evidence suggests that the decline in semen volume and sperm concentration with shorter abstinence periods is accompanied by a substantial improvement in sperm motility characteristics, especially progressive motility and velocity. Nevertheless, available data are insufficient to support definitive conclusions regarding the influence of the ejaculatory abstinence period on advanced semen parameters (ROS, DNA fragmentation and seminal plasma antioxidant capacity) and pregnancy rates. In conclusion, taking all data into account, shortening of the abstinence period may be beneficial to sperm quality. Furthermore, we recommend that the current guidelines regarding the prescribed abstinence period should be revisited.