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男人生育能力随年龄长而下?/title>
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<div class=wzdh><a href='/Index.html'>仁爱健康?/a> > <a href='/Baojian/Index.html'>保健频道</a> > <a href='/Baojian/manbj/Index.html'>男性保?/a> > <a href='/Baojian/qcnx/Index.html'>青春期保?/a> > 内容阅读</div>
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<div class=bt><h1>男人生育能力随年龄长而下?/h1></div>
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<div class=time>08-03-19 15:13:21 译名</div>
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<div class=key>关键词：<a href='/List.aspx?chid=21&Keyword=%e7%94%b7%e6%80%a7%e4%bf%9d%e5%81%a5&FieldName=tagnamestr' target='_blank'>男性保?/a></div>
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<BR> 英国布里斯托尔和布鲁那尔的科学家们研究发现，男人也有生物钟，他们的生育能力和女人一样，也会随着年龄的增长而下降。男人在25岁以前使其性伙伴一年内不受孕的机率只有8%，但是到35岁时，就会上升到15%?nbsp;<BR> <BR> 布里斯托尔圣米切尔医学院妇产科系的克里斯-福德博士说，这是关于男性生育能力随着年龄下降的首次研究。他说人们虽然一直怀疑男人的生育能力会随年龄的增长而下降，但这一假设一直未得到证实。福德和他的同事研究了英国的8500对夫妇，并就年龄对男性的影响进行了研究。研究发现，在某种程度上，男人与女人都有生物钟，当进?0岁以后，生物钟就开始起作用了。研究还发现，在对不孕夫妇的诊断中，男子的年龄也是一个因素?nbsp;<BR> <BR> 但现在还不清楚男人的年龄为什么会影响生育能力，但是至少有三个因素是重要的。一般来说，夫妇在婚后一年的性活动就会减少。随着年龄的增长，夫妇性活动的次数也会下降，受孕的机率也就小了。年龄还会影响精子的质量，环境因素和疾病都会对精子造成影响。这些因素决定了大龄男子作父亲花的时间要更长一些?nbsp;<BR> <BR> 女性的生物钟一般在35岁开始起作用，一直到更年期丧失生育能力的50岁左右。现代的先进医学技术可以使用年轻女性捐献的卵子?0多岁的妇女受孕生育?nbsp; <BR><BR>
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