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精子数量正在减少?你知道吗 – 译学馆
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精子数量正在减少?你知道吗

Yes, Sperm Counts Are Plummeting... And Scientists Are Worried

这个话题怎么说都会有点儿尴尬 所以我就开门见山了:
There’s no easy way to say this so I’m just going to come right out and say it:
男同胞们 我们的精子数量似乎在大幅减少
Gentlemen,it would appear our sperm counts are dropping… a lot.
根据最近的研究分析发现 精子数量似乎
That’s according to a new meta analysis of studies that have looked at sperm counts
回到1973年西方国家的男人们的水平
from men in western countries going all the way back to 1973.
研究发现 精子总数平均下降了59%以上
The study found that the average total sperm count has dropped by over 59%, while the average
与此同时 精子浓度也下降了52%以上
concentration of sperm has dropped over 52 percent.
我知道这听起来难以置信 否认也是于情于理
I know that might be hard to hear, and denial is a natural response.
即使首席研究人员也说这难以置信
Even the lead researcher said it was hard to believe.
但不幸的是 这项研究似乎很可靠
But unfortunately it looks like the study is pretty solid.
采用荟萃分析法对精子数量进行研究早有先例
There have been meta analyses of sperm count studies in the past, but critics have never
但批评家们从来就没满意过
been satisfied with them.
1992年开展了一项依赖于61份报告的名为卡尔森研究的研究
One such meta analysis from 1992 –known as the Carlsen study– looked at 61 studies and
同样发现了精子数量在下降的问题
also found sperm counts were dropping.
但是 批评家认为卡尔森研究存在缺陷
But critics say the Carlsen study is flawed because one of the studies it used contributed
因为一个曾经贡献了30%的参与者的研究 严重影响了结果
30% of the participants, disproportionately skewing the results.
即使有这样严重的缺陷 最新的荟萃分析法的作者
Even with this significant flaw, the authors of the latest meta analyses describe the Carlsen
称卡尔森研究为精子数方面的“开创性论文”
study as a “seminal paper” on sperm count, which is the funniest joke I’ve ever heard
我想这是我听过的科学家做的最好笑的笑话
a scientist make and I wish I thought of it.
不管怎样这些自作聪明的人带着他们的最新论文 试图修正卡尔森研究的缺陷
Anyway, with their latest paper, these smart-alecs sought to correct the Carlsen study’s misfires.
他们从185份研究中汇总数据 其中最大的研究捐献的只占
They drew their data from 185 studies, the largest of which contributes only 5% of the
参与者的5%
participants.
这项研究使用了近40年 50个国家的
The study used data from almost 43,000 men who were well distributed across nearly 40
近43000名男性的数据
years and 50 countries.
之所以选择这项研究 是因为他们中的男性由于不育问题而没有精子计数
The studies were chosen because the men in them were not having their sperm counted because
而分析则涉及了许多因素 如年龄和男性距离上次
of infertility issues, and the analysis accounted for tons of factors like age and how long
嗯……“给了一个样本”有多久 可以这么说
the men had gone since they last uh… “gave a sample,” so to speak.
即使采用这种极端保守的方法 结果看起来也不好
Even with this ultra-conservative approach, the results look bad.
在1973年 平均精子浓度为9900万个每毫升
In 1973 the average sperm concentration was 99 million per milliliter.
到2011年已降到4700万个每毫升
As of 2011 it had dropped to 47 million per millilitre.
当受孕几率开始下降到一个极致 4000万的时候 这一点都不过分
That’s not too far from the point when odds of conception start to take a hit, the 40 million mark.
更糟糕的是:下滑率似乎并没有显示出任何放缓 的迹象
And there’s more bad news: the rate of decline doesn’t seem to be showing any signs of slowing.
我确信你想问的是:“为什么? 是什么造成了精子大量的减少?”
Now the question I’m sure you’re asking is, “Why? What’s causing such a remarkable drop off?”
类似这样的问题是这个研究不能解释的
That’s a question a study like this can’t answer.
作者推测 这可能是由于在出生前和成年时
The authors speculated it may be due to increased exposure to certain chemicals like pesticides,
接触某些杀虫剂 铅或阻燃剂等化学物质过多造成的
lead, or fire retardants, both before birth and as an adult.
精子数量也会受到压力 肥胖以及吸烟的影响
Sperm count can be affected by stress, obesity, and smoking too.
它甚至根据季节和气候波动 导致一位与这项研究无关的科学家
It’s even known to fluctuate based on season and climate, leading one scientist unconnected
推测全球气候变暖可能是原因
to the study to speculate that global temperature increases could be a contributor.
似乎没有足够的理由来担心气候变化
As if there weren’t enough reasons to worry about climate change, apparently it might
显然这是我们自己的事
be cooking our huevos too.
这项新的研究并不完美 怀疑论者注意到
The new study isn’t perfect of course, and skeptics have noted that the original studies
最初的研究并没有说明男性的健康和生活方式的因素都会影响精子数量
that it drew from didn’t account for the men’s health and lifestyles, both factors
所以可能会有一些差异
that can impact sperm count, so there could be some variability there.
精子计数方法在各国尚未得到标准化
And sperm count methodology has not been standardized across countries.
但其他科学家已经表示 精子数量下降却是正式答复
Still, other scientists have said that for a definitive answer on declining sperm count,
这和我们即将到来的情况一样
this is as close as we’re going to come.
重复一遍 这只是一个表明精子数量下降的强有力的证据
To repeat though, this is just really strong evidence that there is a decline, and a pretty
而且使人担忧的问题
alarming one at that.
但动机和原因仍然未知
But the cause or causes are still very much unknown.
为了人类的繁衍生息 需要更多有关精子的研究
For the continued propagation of the human race, more research and sperm is needed.
精子除了对生宝宝有效外 它也可能有医疗用途
Sperm isn’t just useful for baby making, it may have medical uses too, like delivering
比如运送抗癌药
cancer drugs.
核实特雷斯的视频是我听过的最疯狂的事
Check out Trace’s video here for the craziest thing I’ve ever heard.
好了 伙计们 你们对此是担忧还是自信满满呢?
Alright guys, are you worried about this news or are you confident in your frosted minimes?
欢迎参与评论 订阅 在下期的Seeker中我会给你们种子
Let us know in the comments, don’t forget to subscribe, and I’ll semen you next time on Seeker.

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有关精子数量减少的相关研究,以及原因分析

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视频来源

https://www.youtube.com/watch?v=T8Ij700_gbI

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