Cross‐sectional study of semen parameters in a large group of normal Chinese men

Wang, C.; Chan, Sandy; Leung, A. F.; Ng, Rakova; Ng, Mee Kam; Tang, Lynn; K., H.; Tsoi, Wai‐Loong; Kwan, Marie

doi:10.1111/j.1365-2605.1985.tb00840.x

Cited by 54 publications

(37 citation statements)

References 29 publications

(19 reference statements)

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“…Several other studies did not find any differences among men of different ages in their semen volume, 18,19 while one reported an increase in volume with age. 20 As such, while the majority of studies suggest that a decrease in semen volume with paternal age occurs, the exact relationship is unclear.…”

Section: Effect Of Paternal Age On Semen Qualitymentioning

confidence: 81%

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The effects of advanced paternal age on fertility

Kovac¹,

Addai²,

Smith³

et al. 2013

Asian J Androl

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Modern societal pressures and expectations over the past several decades have resulted in the tendency for couples to delay conception. While women experience a notable decrease in oocyte production in their late thirties, the effect of age on spermatogenesis is less well described. While there are no known limits to the age at which men can father children, the effects of advanced paternal age are incompletely understood. This review summarizes the current state of knowledge regarding advanced paternal age and its implications on semen quality, reproductive success and offspring health. This review will serve as a guide to physicians in counseling men about the decision to delay paternity and the risks involved with conception later in life.

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Section: Effect Of Paternal Age On Semen Qualitymentioning

confidence: 81%

“…To add to the controversy, two studies found an increase in sperm motility in relation to increasing age, with a 0.06% increase for each year of age. 19,20 On the whole, however, there appears to be a preponderance of evidence to suggest that APA is associated with decreased sperm motility.…”

Section: Effect Of Paternal Age On Semen Qualitymentioning

confidence: 99%

The effects of advanced paternal age on fertility

Kovac¹,

Addai²,

Smith³

et al. 2013

Asian J Androl

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“…A diminuição do percentual de espermatozóides móveis, observada em 12 das 20 publicações 7,12,13,[15][16][17][18][19][20][21][22][23] , foi mais freqüente, sendo mais evidente quando houve controle no período de abstinência. A média de redução da motilidade anual variou de 0,3 13 a 0,7% 7 .…”

Section: Discussionunclassified

Interferência da idade sobre a qualidade seminal

Cavalcante¹,

Rocha²,

Dias³

et al. 2008

Rev. Bras. Ginecol. Obstet.

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XLSTAT (p<0,05). RESULTADOS: os indivíduos estudados tinham média de idade de 37±7,9 anos, com um volume seminal médio de 3±1,4 mL, uma concentração espermática de 61,4±66,4 espermatozóides por mL de sêmen, motilidade progressiva de 44,7±19,4% do total de espermatozóides e morfologia normal de 11,2±6,6% dos espermatozóides. As médias de idade entre os grupos foram semelhantes, exceto a média dos indivíduos com hipoespermia, que foi significativamente maior que a dos homens com normoespermia (39,6±10,3 versus 36,5±7,3, p=0,001). CONCLUSÕES: a idade interfere, de forma inversamente proporcional, sobre o volume do ejaculado, porém não exerce influência na concentração, motilidade e morfologia espermática.Abstract PURPOSE: to evaluate the influence of age on the quality of semen in men submitted to spermatic analysis in a human reproduction service, in cases of conjugal infertility. METHODS: a retrospective study in which the spermiograms of all men in process of investigation for conjugal infertility in a service of assisted reproduction in the Northeast of Brazil were evaluated from September 2002 to December 2004. A number of 531 individuals submitted to 531 spermatic evaluations were included in the study. The following parameters have been analyzed: spermatic volume, concentration, motility and morphology. The men under investigation have been divided in groups, according to the results obtained in each of the variables studied. Seminal volume groups were divided in: hypospermia, normospermia and hyperspermia. Spermatic concentration groups were divided in: azoospermia, oligospermia, normospermia and polyspermia. Motility groups were divided in: normal motility and asthenospermia. Morphology groups were divided in: normal morphology and teratospermia. The t test has been used to compare the average age of patients in groups with normal and in groups with altered parameters. The program XLSTAT (p<0.05) has been used for the statistical analysis. RESULTS: the individuals studied presented an average of 37±7.9 years old, with an average of seminal volume of 3±1.4 mL, a spermatic concentration of 61.4±66.4 spermatozoids by mL of semen, a progressive motility of 44.7±19.4% of the total of spermatozoids and normal morphology of 11.2±6.6% of the spermatozoids.

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“…Many studies in the literature have suggested a decline in semen quality and quantity over time (3)(4)(5)(6)(7)(8)(9)(10)(11)(12). …”

Section: Discussionmentioning

confidence: 99%

“…In 1951, MacLeod and Gold's study had set the minimal sperm count of 20 X 106 as a statistically significant important parameter for male fertility; the mean density for fertile man in their study was 107 X 106 (2). Since then, a number of studies have suggested an international decline in semen quality over the last several decades (3)(4)(5)(6)(7)(8)(9)(10)(11)(12). Recently, in a metaanalysis of 61 studies worldwide, Carlesen et aL reported a trend toward decreasing sperm densities and volume of seminal fluid over the past 50 years (8)° On the other hand, other studies (13)(14)(15)(16) have shown no decrease in semen quality over the past 20 years.…”

Section: Introductionmentioning

confidence: 99%