冬春两季的精子质量较高
<p><span word="Israeli">Israeli</span> <span word="scientists">scientists</span> <span word="studied">studied</span> <span word="samples">samples</span> <span word="from">from</span> <span word="more">more</span> <span word="than">than</span> 6,000 <span word="men">men</span> <span word="who">who</span> <span word="were">were</span> <span word="being">being</span> <span word="treated">treated</span> <span word="for">for</span> <span word="infertility">infertility</span>. <span word="They">They</span> <span word="found">found</span> <span word="sperm">sperm</span> <span word="in">in</span> <span word="greater">greater</span> <span word="numbers">numbers</span>, <span word="with">with</span> <span word="faster">faster</span> <span word="swimming">swimming</span> <span word="speeds">speeds</span>, <span word="and">and</span> <span word="fewer">fewer</span> <span word="abnormalities">abnormalities</span>, <span word="in">in</span> <span word="semen">semen</span> <span word="made">made</span> <span word="during">during</span> <span word="the">the</span> <span word="winter">winter</span>. <span word="The">The</span> <span word="sperm">sperm</span> <span word="declined">declined</span> <span word="steadily">steadily</span> <span word="in">in</span> <span word="quality">quality</span> <span word="from">from</span> <span word="spring">spring</span> <span word="onwards">onwards</span>. <span word="The">The</span> <span word="researchers">researchers</span> <span word="say">say</span> <span word="this">this</span> <span word="may">may</span> <span word="explain">explain</span> <span word="why">why</span> <span word="there">there</span> <span word="are">are</span> <span word="so">so</span> <span word="many">many</span> <span word="babies">babies</span> <span word="born">born</span> <span word="in">in</span> <span word="the">the</span> <span word="autumn">autumn</span>.</p><p>以色列科学家对6000名以上患有生育方面疾病的男子进行抽样研究，发现冬季产生的精子在数量和游泳速度方面都优于其它季节，畸形情况也比较少。而自进入夏季，精子质量就开始全面下降。研究人员声称，这也是很多小孩在秋季出生的原因。</p><p><span word="The">The</span> <span word="reason">reason</span> <span word="why">why</span> <span word="sperm">sperm</span> <span word="appears">appears</span> <span word="to">to</span> <span word="be">be</span> <span word="healthier">healthier</span> <span word="in">in</span> <span word="winter">winter</span> <span word="isn">isn</span>'<span word="t">t</span> <span word="yet">yet</span> <span word="clear">clear</span>. <span word="One">One</span> <span word="theory">theory</span> <span word="is">is</span> <span word="sperm">sperm</span> <span word="is">is</span> <span word="affected">affected</span> <span word="by">by</span> <span word="warn">warn</span> <span word="temperatures">temperatures</span>.</p><p>但是，研究人员还并未完全明白冬季精子质量高的原因。一种可能的解释是较高的温度对精子会有不利的影响。</p><p><span word="In">In</span> <span word="animal">animal</span> <span word="studies">studies</span>, <span word="seasonal">seasonal</span> <span word="changes">changes</span> <span word="in">in</span> <span word="sperm">sperm</span> <span word="production">production</span> <span word="and">and</span> <span word="fertility">fertility</span> <span word="have">have</span> <span word="been">been</span> <span word="linked">linked</span> <span word="to">to</span> <span word="factors">factors</span> <span word="ranging">ranging</span> <span word="from">from</span> <span word="temperature">temperature</span>, <span word="to">to</span> <span word="length">length</span> <span word="of">of</span> <span word="daylight">daylight</span> <span word="exposure">exposure</span> <span word="and">and</span> <span word="hormone">hormone</span> <span word="variations">variations</span>.</p><p>研究人员在对动物的研究中就发现温度变化和精子的产生与生育能力大有关系。当然季节规律对于那些精子排出规律反常的男子来说不会有什么影响。</p><p><span word="Writing">Writing</span> <span word="in">in</span> <span word="the">the</span> <span word="American">American</span> <span word="Journal">Journal</span> <span word="of">of</span> <span word="Obstetrics">Obstetrics</span> & <span word="Gynaecology">Gynaecology</span>, <span word="the">the</span> <span word="researchers">researchers</span> <span word="said">said</span> <span word="that">that</span> <span word="if">if</span> <span word="there">there</span> <span word="is">is</span> <span word="a">a</span> <span word="seasonal">seasonal</span> <span word="pattern">pattern</span>, <span word="that">that</span> <span word="knowledge">knowledge</span> <span word="may">may</span> ‘<span word="be">be</span> <span word="of">of</span> <span word="paramount">paramount</span> <span word="importance">importance</span>, <span word="especially">especially</span> <span word="in">in</span> <span word="couples">couples</span> <span word="with">with</span> <span word="male">male</span>-<span word="related">related</span> <span word="infertility">infertility</span> <span word="struggling">struggling</span> <span word="with">with</span> <span word="unsuccessful">unsuccessful</span> <span word="and">and</span> <span word="prolonged">prolonged</span> <span word="fertility">fertility</span> <span word="treatments">treatments</span>.’</p>
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