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【bio-news】高温导致不育
Kounteya Sinha
12 Apr, 2007 0141hrs ISTTIMES NEWS NETWORK
NEW DELHI: Researchers recorded the temperature changes to the scrotum caused by laptop use among 29 healthy male volunteers aged between 21 and 35 and found that just sitting with thighs pressed together, caused scrotal temperatures to rise by 2.1 degrees C.
The AIIMS study also found that majority of men who were exposed to high temperature at their work places welders, dyers, blast furnace workers, cement and steel factories are also more prone to infertility. All this happens because even small changes in temperature have a negative effect on sperm production.
Testes are located outside of the body, suspended by the spermatic cord within the scrotum. This allows for more efficient and fertile sperm production.
The temperature of the testes is usually three degrees lower than the core body temperature (37 degrees C or 98.6 degrees Fahrenheit). Even one degree elevation in testicular temperature leads to 14% depression of spermatogenesis.
"Not only has quantity of sperm production declined in males across the world, there has been a decrease in mortility (sperm movement) and morphology (shape and structure) of the sperms.
"There has been a 2% decrease in quality of male sperm annually. Also, 40% men in the reproductive age group are at present recording a quantitative and qualitative decline in sperm quality," Dr Dada said. The study also found that nearly 20% of infertile men with low sperm count, or oligospermia, harboured genetic abnormalities.
The abnormality either involved sex chromosomes or autosomes or micro deletions in the 'Y' chromosome, said Dada. The 'Y' chromosome harbours the gene critical for germ cell development and differentiation, without which a person will have no sperms or will have very low sperm count.
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高温能导致不育
作者：Kounteya Sinha
12 Apr, 2007 0141hrs ISTTIMES NEWS NETWORK
2007年4月12日 1：41 ISTTIMES 新闻网
NEW DELHI:新德里消息： Researchers recorded the temperature changes to the scrotum caused by laptop use among 29 healthy male volunteers aged between 21 and 35 and found that just sitting with thighs pressed together, caused scrotal temperatures to rise by 2.1 degrees C.
研究人员们通过记录29名年龄在21到35岁之间的健康男性志愿者使用笔记本电脑时引起的阴囊温度变化，发现仅仅是合并两大腿坐着，就能使阴囊温度上升2.1摄氏度。
The AIIMS study also found that majority of men who were exposed to high temperature at their work places welders, dyers, blast furnace workers, cement and steel factories are also more prone to infertility.全印医学科学院（AIIMS）的这项研究发现，在工作场所暴露于高温的大部分男性，如电焊工、印染工、高炉工、水泥厂及钢厂的工人更易于出现不育。 All this happens because even small changes in temperature have a negative effect on sperm production.之所以会这样是因为哪怕微小的温度变化对精子的产生都会有负面的作用。
Testes are located outside of the body, suspended by the spermatic cord within the scrotum.睾丸位于身体外部，由输精管悬挂于阴囊内。 This allows for more efficient and fertile sperm production.这有利于更有效地产生有生育力的精子。
The temperature of the testes is usually three degrees lower than the core body temperature (37 degrees C or 98.6 degrees Fahrenheit).睾丸的温度通常比核心身体温度（37摄氏度或98.6华氏度）低3度。 Even one degree elevation in testicular temperature leads to 14% depression of spermatogenesis.睾丸的温度哪怕只升高1度就能使产生的精子下降14%。
"Not only has quantity of sperm production declined in males across the world, there has been a decrease in mortility (sperm movement) and morphology (shape and structure) of the sperms.“不单止整个世界男性的精子产生数量在下降，精子的活动能力（精子的运动 译注：原文mortility 疑为 mobility 之误）及形态指标（形状与结构）也在下降。
"There has been a 2% decrease in quality of male sperm annually.“男性的精子质量一直以来每年在下降2%。” Also, 40% men in the reproductive age group are at present recording a quantitative and qualitative decline in sperm quality," Dr Dada said.而且，处于生育年龄段的男性目前有40%的精子质量出现了数量及质量的下降，”Dada博士称。 The study also found that nearly 20% of infertile men with low sperm count, or oligospermia, harboured genetic abnormalities.该研究还发现患有精子计数偏低，也被称作少精症的不育男性中有近20%的人有各种遗传异常。
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作者:admin@医学,生命科学 2010-11-28 17:11
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