蒙族男生青春期性发育与形态发育关系的研究

采用综合性发育分期表示方法分析了355名8～15岁蒙族男生青春期性发育水平与形态发育的关系。结果显示,随性发育水平的提高,形态发育水平呈上升趋势,性发育为工期时形态发育速度最快,同时体内率酮含量与性发育、行态发育均具有正相关关系。可见在种经一内分泌系统的调节下,蒙族男生青春期性发育与形态发育的联系是必然存在的。     

蒙族男生青春性发育与形态发育关系的研究

采用综合性发育分期表示方法分析了３５５名８－１５岁蒙族男生青春期性育水平与形态发育的关系。结果显示，随性发育水平的提高，形态发育水平呈上升趋势，性发育为期时形态发育速度最快，同时体内睾酮含量与性发育、行态发育均具有正相关关系，可见在神经－内分泌系统的调节下，蒙族男生青春期性发育与形态发育的联系是必然存在的。     

青春期学生血脂水平与青春期发育关系研究

目的 描述青春期学生血脂水平及其与性发育和性激素水平之间的关联,为制定青春期学生血脂标准和开展青春期脂代谢异常的研究提供依据.方法 2011年4-6月,随机抽取上海市2个区6所学校1298名六至八年级学生,询问青春期发育的情况、测量身体形态并检测血脂、性激素等指标.结果 影响男生血脂水平的因素主要是腰围、年龄和发生遗精,三酰甘油和高、低密度脂蛋白与腰围有关(B值分别为0.016,-0.008,0.011,P值均＜0.01),总胆固醇、高密度脂蛋白与年龄有关(B值分别为-0.112,-0.046,P值均＜0.01),发生遗精男生的低密度脂蛋白低于未发生遗精的男生(B=-0.163,P＜0.05).影响女生血脂水平的因素主要是腰围和发生月经初潮,三酰甘油和高、低密度脂蛋白与腰围有关(B值分别为0.134,-0.009,0.110,P值均＜0.01),发生月经初潮以后女生的总胆固醇和三酰甘油低于未发生月经初潮的女生(B值分别为-0.134,-1.144,P值均＜0.05).结论 青春期学生血脂水平受到年龄和青春期发育的影响,腰围对血脂的影响较大.评估青少年血脂水平时,需要将年龄和青春期发育的因素考虑进去.     

青春期发育与血压关系的研究

儿童少年处于一个动态发育时期,在此期间,他们的生理、心理和激素等各方面都发生着剧烈的变化。血压也不例外,发生着一生中最显著的变化,并形成两性差异。一般认为,人群血压水平随着生命过程的延续而逐渐上升,且大多数血压升高发生在20岁以前。成人期血压升高,除了遗传因素外,主要与食盐、超重、高血脂、吸烟、精神紧张等多种因素有关。然而在一些原始部落,人群成人血压终     

青春期发育与血压关系的研究

儿童少年处于一个动态发育时期,在此期间,他们的生理、心理、情感和激素等各方面都发生着剧烈的变化。血压也不例外,发生着一生中最显著的变化,并形成两性差异。一般认为,人群血压水平随着生命过程的延续而逐渐上升,且大多数血压升高发生     

太原市女学生10年青春期发育研究

为了解我市女学生青春期发育的变化规律、特点和发展趋势,我们将1985年与1995年我市女学生形态及第二性征的发育情况进行了分析比较。1资料来源本文资料来源于太原市1985年和1995年学生健康监测资料。两次监测形态指标均按《中国学生体质、健康调查研究测试细则》规定的方法测试,月经初潮用概率单位回归法计算半数月经初潮年龄。2结果与分析2．1初潮年龄太原市女学生半数月经初潮年龄1985年为14．26岁,1995年为13．58岁,10年间初潮年龄提前了0．68岁,与沈安等。周报告的结果基本一致。可见我市女学生月经初潮年龄存在着长期加速趋势,…     

男童青春期体格生长与性发育的关系

目的分析男童青春期生长特点,探索男童青春期生长与性发育的关系,为准确反映男童青春期发育情况提供参考。方法对重庆市九龙坡区一至四年级男童的青春发育进行追踪随访,每6个月随访1次,共随访5年。选取其中男童的身高、体重、体质量指数(BMI)、首次遗精年龄及睾丸发育的数据进行分析。以青春期生长速度高峰值(PHV)为基点,分析PHV平均水平及峰值年龄(PHA)。采用方差分析比较不同年龄组男童首次遗精前后的身高生长速度;采用Kendall等级相关分析不同睾丸发育分期与BMI的关系。结果青春期身高队列男童PHA平均(11.72±1.03)岁,首次遗精前后生长速度队列首次遗精年龄平均(12.45±0.98)岁。首次遗精年龄前后1年的身高增值差异有统计学意义(P<0.05);男童首次遗精年龄越小,其后1年身高增长值越大。男童11～14岁各组的身高、体重、BMI与睾丸容积呈正相关(P值均<0.05)。结论男童首次遗精前1年身高增长值达高峰,遗精后增长值开始下降,且男童首次遗精年龄与其后1年的身高增值呈负相关,男童睾丸发育与身高、体重及BMI呈正相关。     

膳食中植物雌激素摄入量与青春期女生性发育的关系

目的探讨膳食中植物雌激素摄入量与青春期女生性发育的关系。方法采用整群抽样方法,在信阳市选取3所小学的在校五年级、六年级女生为对象,对其进行植物雌激素膳食调查和性发育评价。植物雌激素膳食调查采用24 h回顾法和FFQ法。结果共调查1 278名女生,乳房发育提前检出率为15.8%;乳房发育延迟检出率为14.3%。豆类、豆制品类、瓜籽类和油类4类食物摄入量与女生性发育情况差异均无统计学意义(χ²=1.29,P=0.76、χ²=7.76,P=0.09、χ²=1.23,P=0.78、χ²=1.16,P=0.88)。总植物雌激素和异黄酮类植物雌激素摄入量与女生性发育情况差异有统计学意义(χ²=11.68,P=0.03、χ²=11.02,P=0.03)。结论总植物雌激素和异黄酮类植物雌激素摄入量多有可能引起青春期女生性发育提前。     

膳食中大豆异黄酮与青春期女生性发育关系

目的 探讨膳食中大豆异黄酮摄入量与青春期女生性发育的关系。方法 采用整群抽样方法,在信阳市选取3所小学的在校四年级、五年级、六年级女生为对象,对其进行膳食调查和性发育评价。膳食调查采用定量食物频率问卷法。结果 共调查1 278名女生,性发育提前检出率为15.8%;性发育延迟检出率为14.3%。不同乳房发育组、月经初潮组和性发育组（发育提前、发育正常和发育延迟）的大豆异黄酮和染料木黄酮摄入量差异均有统计学意义（均P<0.01）。结论 大豆异黄酮和染料木黄酮摄入量多有可能与青春期女生乳房发育、月经初潮和性发育提前有关。     

青春期的性发育与表现

青春期大约从１０岁开始到２０岁结束，是儿童向成人发育的过渡阶段。身体的发育主要有以下三个特点：身体增长速度加快；内脏的功能逐渐完善;生殖器官迅速发育成熟。而最显著的特点是性器官和第二性征开始发育和成熟。男女的性器官在胎儿时期就已经形成，但是在出生后的第一个１０年里，生长发育很缓慢，几乎没有多大的变化，直到青年期全身快速发育之后才开始迅速发育，可见在全身没有发育成熟时，生殖器官的发育是没有意义的。进入青春期后，在脑垂体分泌的促性腺激素作用下，睾丸和卵巢迅速发育长大，并分别分泌雄激素和雌激素，分别作…     

蒙族男生青春期性发育与体成分关系探讨

本文调查了155名8～15岁牧区蒙族男生性发育、皮褶厚度及部分年龄段唾液睾酮水平．并以右肱三头肌及右肩胛下角皮褶厚度推算了体成分。分析结果表明：随性发育水平升高，瘦体重增加明显．总体脂呈缓慢上升．而体脂比则有下降趋势，提示蒙族男生育着期性发育与体成分的变化有一定联系。     

Sex with Men Before Coming-Out: Relation to Sexual Activity and Sexual Risk-Taking Behavior

This study examined the difference in sequence of coming-out and first same-sex experience in relation to risk-taking behavior in a sample of Dutch gay and bisexual men. A questionnaire assessed age of disclosure (coming-out) and age of first same-sex experience, and information on sexual history, sexual relationships, and sexual behavior. It was found that 68% of respondents engaged in their first same-sex experience before coming-out. This proportion increased with age. Men who had sex with men before coming-out reported more lifetime sex partners and more casual sex partners in the past 6 months than men in which this sequence was reversed. In addition, among this group a higher proportion of men reported STDs, engaging in anal intercourse with casual partners in the previous 6 months, and unprotected anal sex with casual sex partners in the recent past, compared to men who came out before having their first same-sex experience. The extent to which external factors (such as tolerance toward homosexuals) or internal factors (such as personality factors) can account for the difference in sexual behaviors in general and sexual risk-taking behavior in particular could be subject of further study.     

青少年性观念与婚前性行为关系的探讨

本文对783名大学生与314名行婚前检查女青年的性观念与性行为关系，进行了一元与多元分析（以＞24岁306例作对照）。结果表明，大学生与婚前青少年的性行为与性文化观念、性知识、婚恋观等有密切关系。     

单纯性肥胖青少年性发育的调查分析

用放免法测定肥胖组与对照组男女儿童血清睾酮、脱氢表雄酮硫酸酯（ＤＨＥＡＳ）的含量及性征与性成熟的状况。结果显示肥胖组男性儿童血清睾酮含量为（１０．３６±５．７２）ｎｍｏｌ／Ｌ，对照组为（８．６５±４．２１）ｎｍｏｌ／Ｌ，肥胖组显著地高于对照组（Ｐ＜０．０１）。肥胖组女性儿童血清ＤＨＥＡＳ含量为（８．２５±６．４７）ｐｍｏｌ／Ｌ，对照组为（５．６３±４．９８）ｐｍｏｌ／Ｌ，肥胖组亦明显高于对照组（Ｐ＜０．０１）。肥胖组男性睾丸的纵横径及阴茎的长度和围度与对照组比较均有显著性差异（Ｐ＜０．０１）。肥胖组男性首次遗精年龄及女性月经初潮年龄和第二性征发育均早于对照组，在统计学上均有显著意义（Ｐ＜０．０１）。提示肥胖组性激素分泌及性发育、性成熟均明显高于、早于对照组。由此可见肥胖促进了性发育和性成熟，使得肥胖儿易出现性早熟的倾向，因此对单纯性肥胖青少年的性教育显得更加重要。     

A Twin Study of Sexual Behavior in Men

The role of genetic and environmental influences on age of initiation of first sexual relations and engaging in sexual activity with multiple partners (10 or more partners in 1 year) was investigated in male twins (N = 6,744) from the Vietnam Era Twin Registry. Individual differences in both types of sexual behaviors were heritable, but only age of onset of sexual relations was significantly influenced by the environment shared by the twins. There was a moderate negative correlation between age of initiation of sexual relations and the multiple partners variable; initiating sexual relations earlier was associated with a higher probability of having multiple partners. The additive genetic influence on age of initiation also influenced the multiple partners variable. The substantial unique environmental influences on each variable were uncorrelated with each other. The data suggest that the observed association between age of initiation of sexual relations and having multiple partners is due to genetic influences common to both behaviors.     

壬基酚对雌性SD大鼠早期性发育的影响

目的 壬基酚是一种典型的环境雌激素,大量应用于塑料、橡胶等行业。本实验旨在探索其对雌性大鼠早期性发育的影响。方法 按照美国NTP(National Toxicology Program)方法对妊娠SD大鼠进行壬基酚口服染毒(0.1%、0.5%和10%).称量F1代出生重、40日龄子宫重,取子宫、卵巢固定,统计初/次级卵泡数,检测细胞增殖核抗原(PCNA)及雌激素受体(ER).结果 染毒组F1代出生重都低于对照组(P均<0.01);40日龄(体重修正)子宫重明显大于对照组(P均<0.01);初级和次级卵泡总数也显着多于对照组(P均<0.01);各组F1代性别比例均为1:1;0.1%和10%壬基酚组卵巢PCNA灰度值明显低于对照组(P<0.01和<0.05);对照组和染毒组子宫ER灰度值差异不明显(P均>0.05).结论 壬基酚能诱导卵泡和子宫的早期发育。     

不同体成分10岁男童性发育与体脂及睾酮水平追踪研究

目的探讨不同体成分青春早期男孩性发育与体脂及睾酮水平之间的相互关系,为儿童青少年生长发育研究提供依据。方法选取66名10岁男童,按年龄、身高、第二性征进行1∶1∶1匹配,追踪观察3 a,检测其体成分、性发育状况,测定睾酮水平。结果3组男童的体脂肪和瘦体重均随年龄增加而增加;肥胖组男孩阴茎长度小于中等组和消瘦组;肥胖组的阴茎长度和横径与体脂肪呈负相关,与睾酮水平呈正相关。结论青春早期肥胖男孩性器官发育滞后,与体脂肪和睾酮关系密切。     

Timing of Pubertal Maturation and the Onset of Sexual Behavior among Zimbabwe School Boys

The relationship between reproductive maturation and the onset of sexual behavior in boys across cultures is unclear. To explore the relative timing of pubertal events and their relationship to the onset of sexual behavior, we used data collected from 442 Zimbabwe school boys aged 12–18 years. Measures of reproductive maturation included self-reported spontaneous nocturnal emission, secondary sexual characteristics, and salivary testosterone. Behavioral measures included age at first sexual fantasies, non-coital sexual behavior, and coitus. Sigmoid interpolation curve techniques indicated a median age of first erection at 10.75 ± 0.11 years, first sexual fantasy at 12.66 ± 0.03 years, first spontaneous nocturnal emission at 13.02 ± 0.03 years, and adult levels of blood testosterone at 17.2 ± 0.7 years. First reported spontaneous nocturnal emission was significantly related to all measures of sexual behavior. Multiple regression models indicated that first reported spontaneous nocturnal emission was a stronger predictor of sexual behavior than variation in secondary sexual characteristics. In addition, testosterone was a significant predictor of sexual fantasies and intercourse, independent of first reported spontaneous nocturnal emission. These results confirm earlier findings in other populations that self-reported spontaneous nocturnal emissions can be used as a marker of pubertal timing among adolescent boys. They also suggest that variation in testosterone plays a role in the onset of sexual behavior among boys, beyond its relationship to developmental timing. The behavioral mechanisms represented by the significant effects of testosterone reported here remain to be investigated.     

Sexual Abuse in Childhood and Sexual Dysfunction in Adulthood: An Australian Population-Based Study

This study examined self-reported adult sexual functioning in individuals reporting a history of childhood sexual abuse (CSA) in a representative sample of the Australian population. A sample of 1793 persons, aged 18–59 years, were randomly selected from the electoral roll for Australian states and territories in April 2000. Respondents were interviewed about their health status and sexual experiences, including unwanted sexual experiences before the age of 16 years. More than one-third of women and approximately one-sixth of men reported a history of CSA. Women were more likely than men to report both non-penetrative and penetrative experiences of CSA. For both sexes, there was a significant association between CSA and symptoms of sexual dysfunction. In assessing the specific nature of the relationship between sexual abuse and sexual dysfunction, statistically significant associations were, in general, evident for women only. CSA was not associated with the level of physical or emotional satisfaction respondents experienced with their sexual activity. The total number of lifetime sexual partners was significantly and positively associated with CSA for females, but not for males; however, the number of sexual partners in the last year was not related to CSA. CSA in the Australian population is common and contributes to significant impairment in the sexual functioning of adults, especially women. These consequences appear not to extend to the other areas of sexual activity considered in this study.     

贵阳市560名8～15岁男性发锌与性发育关系

目的 研究青春期男性发锌与性发育关系.方法 2000年4月对贵阳市区560名8～15岁男性作性发育评价;用火焰原子吸收分光光度计(FAAS)测定发锌含量并判断锌营养状况.结果 男性的发锌值与年龄有关系,10岁及以后的发锌值比8、9岁的有增加.性发育指标中仅生殖器与发锌值有一定的关系,而阴毛则与发锌值的关系不明显.生殖器-阴毛在生殖器3期-阴毛1期及以后未发现与发锌值有明显的关系.结论 青春期男性的发锌水平与性发育的关系可能与体内性激素、生长激素的增加有关.