体重指数增加的男性易发生后代

美国国立交通安全自然科学深入研究组进行的一项深入研究见到，与正常增重的年长者相比较，增重指标增加的年长者生子有可能更大。

Markku Sallmen受聘于芬兰职业卫生深入研究组。他说：“数据显示，年长者增重每增加20磅（分之一9公斤），生子的有可能将增加10%。”增重指标是由人的增重和体重计算来为的数据，对大多数人，增重指标可带入眼睛肥大的有用指标，也常被用来前列腺癌增重太重。

深入研究者对农业卫生深入研究原先中备案的侄女进行了深入研究。这项始于1993年的原先目的是为了检查影响农业生态村贫苦及其家人眼睛健康的因素。

国立交通安全自然科学深入研究组的药理学家Donna Baird博士说：“与增重正常的妇女相比较，太重或肥大的妇女较难怀孕，但是同样情况的年长者是否是存在分娩缺陷尚尚未有人深入研究。”这项结果刊载在2006年9月底《药理学新闻周刊》上。

生子和增重指标的资料叫作1468位贫苦和他们的妻子在登记纳入这项深入研究时完成的问卷调查。后者完成家人眼睛健康调查表，之外侄女的分娩史，前者通报家人增重和体重的调查表。深入研究分析限于登记备案4年前急于分娩及女方年岁略高于40的侄女。

深入研究者将这些侄女分为生子组和可育组，大分之一1年尚未怀孕者归为生子组，在1年内怀孕者归为可孕组。大多数年长者和女性年岁大分之一30岁，28%的侄女有生子病因。

深入研究者见到年长者的增重指标是生子症的独立危险因素。深入研究员调整了其它影响分娩力的因素，如女性的高增重指标、年岁、抽烟、饮酒、暴露出于杀菌剂，调整过后，随着增重指标的增加，生子呈线性增加，在肥大年长者，生子率增加1倍。深入研究者还见到无论年岁大小，年长者的增重指标都是生子症的危险因素。

虽然不能阈值的数据，但据推测太重的年长者较增重正常的年长者次数少，从而影响了分娩。然而，关于精子特性的深入研究见到太重和肥大的年长者，精子质量较低，激素不平衡。

国立交通安全自然科学深入研究组的主任Did A. Schwartz博士说：“这项深入研究提出了某些与肥大有关的另外的眼睛健康缺陷，抑制肥大可促使年长者眼睛眼睛健康，其中就之外他们的生殖眼睛健康。”该深入研究组还提出了一项上属于自己集中力量的原先——“环境自然科学和人类眼睛健康的上新前沿”，这项原先将于明年5月底实施，目的在于依靠交通安全自然科学促使公众了解疾病的发病原因并促使人类眼睛健康。

Men with increased body mass index (BMI) were significantly more likely to be infertile than normal-weight men, according to research conducted at the National Institute of Environmental Health Sciences (NIEHS), one of the National Institutes of Health."The data suggest that a 20-pound increase in men's weight may increase the chance of infertility by about 10 percent," says Markku Sallmen, lead author on the paper who is now at the Finnish Institute of Occupational Health. BMI is a number calculated from a person's weight and height. BMI provides a reliable indicator of body fatness for most people and is used to screen for weight categories that may lead to health problems.The researchers studied couples enrolled in the Agricultural Health Study (AHS), a large project that began in 1993 examining factors that impact the health of farmers and their families in agricultural communities. "Women who are overweight or obese tend to he a more difficult time becoming pregnant than normal-weight women, but whether men who are overweight or obese also he fertility problems had not been studied," says Donna Baird, Ph.D., an NIEHS epidemiologist with the study. The study is published in the September 2006 issue of Epidemiology.The data on infertility and body mass came from questionnaires that 1,468 farmers and their wives completed when they enrolled in the study. The wives completed a family health questionnaire, which included information about the couple's reproductive history. The men reported their weight and height on a questionnaire about their health. The ysis was limited to couples with a pregnancy attempt during the four years before enrollment, and to women under the age of 40. The researchers divided the couples into infertile and fertile groups. The infertile couples were those that tried for longer than a year to conceive, and the fertile couples were those that conceived within a year. The majority of men and women were more than 30 years old. Twenty-eight percent of the couples had experienced infertility.Researchers found that men's BMI was an independent risk factor for infertility. The researchers adjusted for other factors that could affect fertility, including high BMI of the woman, age, cigarette smoking, alcohol intake, and solvent and pesticide exposure. After adjustment, there was a general increase in infertility with increased BMI, reaching a nearly 2-fold increase among obese men. When researchers divided the sample into two equal groups by men's age, they found that men's BMI was a risk factor for infertility in both the older and younger men.The researchers did not he data on frequency of sexual intercourse, so it is possible that overweight men he less sexual intercourse than their normal weight counterparts and this could influence fertility. However, there he been recent studies looking at semen characteristics that show lower semen quality for overweight and obese men, as well as hormonal differences."This study provides data on some additional health problems associated with obesity," said Did A. Schwartz, M.D., director of the National Institute of Environmental Health Sciences. "Preventing obesity can help improve men's overall health, perhaps even their reproductive health."The NIEHS unveiled a new strategic plan, "New Frontiers in Environmental Sciences and Human Health," in May aimed at challenging and energizing the scientific community to use environmental health sciences to understand the causes of disease and to improve human health.叫作

出版人：蓝色虚幻

出版人： 张靖