血栓素、前列环素与运动后蛋白尿生成机制的实验研究

以大鼠为实验对象，测定安静时、大强度间歇负重游泳运动后即刻及运动后休息４５分钟时血浆血栓烷Ｂ_２（ＴＸＢ_２）、６－酮－前列腺素Ｆ_（１２）（６－ｋｅｔｏ－ＰＧＦ_（１２））的浓度变化及尿总蛋白（ＴＰ）、白蛋白（Ａｌｂ）、β_２微球蛋白（β_２－ｍＧ）排泄率变化，以期为运动后蛋白尿的生成机制提供实验材料。结果表明：运动后即刻血浆ＴＸＢ_２、６－ｋｅｔｏ－ＰＧＦ_（１２）明显高于对照组（Ｐ＜０．０５；Ｐ＜０．０１），尿ＴＰ、Ａｌｂ、β_２－ｍＧ排泄率也呈非常显著的升高。运动后休息４５分钟时血浆ＴＸＢ_２及尿ＴＰ、Ａｌｂ、β_２－ｍＧ均呈不同程度的减少。相关分析表明ＴＸＢ_２、ＴＸＢ_２／６－ｋｅｔｏ－ＰＧＦ_（１２）比值与尿ＴＰ、Ａｌｂ、β_２－ｍＧ之间呈高度正相关；虽然６－ｋｅｔｏ－ＰＧＦ_（１２）与尿ＴＰ、Ａｌｂ、β_２－ｍＧ之间呈负相关，但无明显统计意义（Ｐ＞０．０５）。提示血栓素，前列环素的变化可能是运动后蛋白尿生成机制中的一个重要因素。     

牛磺酸对大鼠急性运动后自由基代谢、膜流动性及钙转运变化的影响

５０只雄性Ｗｉｓｔａｒ大鼠（８０ １００ｇ）,随机分为对照组（Ｇ１）,急性运动组（Ｇ２）,急性运动＋牛磺酸组（Ｇ３）,力竭运动组（Ｇ４）,力竭运动＋牛磺酸组（Ｇ５）。牛磺酸补充方式为每日灌服１次（５００ｍｇ／ｋｇ）。喂养２周后,进行负重游泳,测定血液、线粒体和肌浆网各生化指标变化。结果显示“牛磺酸有增加大鼠游泳力竭时间的趋势（０．０５＜Ｐ＜０．１０）;运动后即刻,Ｇ３组ＢＵＮ明显低于Ｇ２组（ｐ＜０．０５）;Ｇ３组ＲＢＣ、血浆及心肌线粒体ＭＤＡ含量明显低于Ｇ２组（Ｐ＜０．０５）;Ｇ３组ＲＢＣ及心肌线粒体ＧＳＨ＿Ｐｘ活力明显高于Ｇ２组（Ｐ＜０．０５）;Ｇ３组心肌线粒体膜荧光偏振度Ｐ明显低于Ｇ２组（Ｐ＜０．０５）。Ｇ３组ＳＲＣａ２＋ ＡＴＰａｓｅ活性和摄钙率明显高于Ｇ２组（Ｐ＜０．０５）。力竭后２４小时,Ｇ５组ＲＢＣ、血浆及心肌线粒体ＭＤＡ含量明显低于Ｇ４组（Ｐ＜０．０５）。以上结果表明,牛磺酸可以通过抗自由基损伤,稳定生物膜和调节钙转运等途径对抗运动性疲劳。     

顺铂化疗中肾毒性的监测

为探讨顺铂化疗中肾毒性的影响，对２４例顺铂治疗的恶性肿瘤患者尿β_２微球蛋白（β_２－ＭＧ）进行监测，并以１０例健康人尿β_２－ＭＧ为正常参考值。结果表明，大剂量组与小剂量组在化疗后同一时间内尿β_２－ＭＧ差异显著（Ｐ＜０．０１）；小剂量Ⅰ组化疗后尿β_２－ＭＧ显著增加（Ｐ＜０．０５）；小剂量Ⅱ组化疗后尿β_２－ＭＧ虽高于正常，但无明显差异（Ｐ＞０．０５）；大剂量Ⅰ组化疗后尿β_２－ＭＧ增加非常显著（Ｐ＜０．０１）；大剂量Ⅱ组化疗后尿β_２－ＭＧ增加，差异非常显著（Ｐ＜０．０１）。提示顺铂小剂量分次给药，大剂量水化及胃复安的应用可明显减低肾毒性。     

术前一次性大剂量甲基强的松龙对腹部手术病人的影响

目的探讨术前一次性大剂量甲基强的松龙（ＭＰ）对腹部手术病人的影响。方法２０例择期腹部手术病人分为两组进行前瞻性、随机、双盲、对照研究。对照组于术前静脉滴注等渗盐水１００ｍｌ；ＭＰ组术前静脉滴注等渗盐水１００ｍｌ＋ＭＰ（３０ｍｇ／ｋｇ）。结果与对照组比较，ＭＰ治疗显著改善了病人术后的疲倦状态（Ｐ＜０．０５）、功能活动过程（Ｐ＜０．０５）、肺功能（ＦＥＶＣ和ＦＥＶ１）（Ｐ＜０．０５）；两组并发症无显著性差异；ＭＰ组住院时间显著短于对照组（Ｐ＜０．０５）；两组术后血浆ＩＬ－２、ＩＬ－６、ＴＮＦα和ＰＧＥ２均无显著性差异；ＭＰ组升高的血浆ＰＭＮ－ｅｌａｓｔａｓｅ浓度较对照组更快地恢复到术前水平。ＭＰ组血浆Ｃ反应蛋白（ＣＲＰ）浓度增高程度显著低于对照组（Ｐ＜０．０５）。结论腹部手术术前一次性大剂量ＭＰ治疗可减轻术后应激反应而有助于病人的恢复     

上海地区成年人胃食管反流病流行病学调查 Ⅱ: 症状与胃食管反流病的关系

在对上海地区成年人胃食管反流症状流行病学调查的基础上，对有烧心、反酸及反食等胃食管反流症状者，按症状轻重记分，根据总分将有症状者分为低分组（６～９分）、中分组（１０～１２分）及高分组（≥１３分），并按随机原则分别抽取２０、１０及１０例，进行２４ｈ食管ｐＨ监测及胃镜检查。结果发现：各有症状组异常胃食管反流（ＡＧＥＲ）及胃食管反流病（ＧＯＲＤ）发生率均明显高于对照组（Ｐ＜０．０５），高分组反流性食管炎（ＲＥ）发生率亦明显高于对照组（Ｐ＜０．０５），但各症状组间无明显差异（Ｐ＞０．０５）。４６．６７％ＡＧＥＲ患者存在ＲＥ，７７．７８％ＲＥ患者证实有ＡＧＥＲ。ＡＧＥＲ、ＲＥ及ＧＯＲＤ患病率分别为３．５８％、２．２７％及２．８６％。     

生活在不同海拔的大鼠脑内β－内啡肽含量的比较研究

用放射免疫测定法（ＲＩＡ）对生活在海拔２２６１ｍ地区（西宁）和海拔３ｍ地区（青岛）的成年Ｗｉｓｔａｒ大鼠脑内β－内啡肽免疫活性物质（β－ＥＰ）的含量进行了比较研究。结果表明垂体内β－ＥＰ的含量与平原者对照组相比，下降非常显著（Ｐ＜０．０１）；皮层与平原者对照组相比，下降亦有显著性意义（Ｐ＜０．０５）。丘脑桥延、纹状体内β－ＥＰ的含量有所下降，但无统计学意义（Ｐ＞０．０５）。提示，高原环境对大鼠各脑区β－ＥＰ的含量有不同程度的影响。     

补充谷氨酰胺对力竭性游泳大鼠肝脏MDA、GSH、SOD含量的影响

目的：探讨补充外源性谷氨酰胺（Ｇｌｎ）对运动机体抗氧化能力的影响。方法：采用大鼠力竭性游泳运动方式，通过补充Ｇｌｎ对比实验，观察力竭运动后１８小时大鼠肝组织中丙二醛（ＭＤＡ）、谷胱甘肽（ＧＳＨ）、超氧化物歧化酶（ＳＯＤ）含量的变化。结果：（１）肝组织ＭＤＡ含量单纯运动组显著高于安静对照组（Ｐ＜０．０１），补充Ｇｌｎ运动组变化不明显，补 充Ｇｌｎ运动组显著低于单纯运动组（Ｐ＜０．０１）。（２）单纯运动组肝组织ＧＳＨ含量显著低于安静对照组（Ｐ＜０．０１），补充Ｇｌｎ运动组显著高于单纯运动组（Ｐ＜０．０５）。（３）肝组织ＳＯＤ活力：单纯运动组显著高于安静对照组（Ｐ＜０．０５），补充Ｇｌｎ运动组变化不明显补充Ｇｌｎ运动组显著低于单纯运动组（Ｐ＜０．０１）。结论：补充外源性Ｇｌｎ有助于维持运动后肝组织中ＧＳＨ水平，增强其抗氧化损伤能力，减轻肝组织中的脂质过氧化反应     

Alzheimer型痴呆的MRI初步研究

目的：探讨Ａｌｚｈｅｉｍｅｒ型痴呆（ＡＤ）患者脑部的ＭＲＩ表现特征和诊断价值。方法：对１０例ＡＤ患者和选择１０例性别、年龄相关且无阳性神经系统体征的老年人进行ＭＲＩ比较研究。测量两组的海马体积、钩间距、胼胝体面积和记录脑实质内有无异常信号。结果：１．ＡＤ组左、右侧平均海马体积明显小于对照组，且有统计学意义（Ｐ＜０．０５）；２．ＡＤ组平均钩间距大于对照组，并有统计学差异（Ｐ＜０．０５）；３．ＡＤ组胼胝体萎缩重于对照组；４．ＡＤ组Ｔ２ＷＩ图像上小斑状高信号（１７个）略多于对照组（１５个），两组无统计学差异（Ｐ＞０．０５）。结论：ＭＲＩ能准确地显示ＡＤ的脑部形态学改变，有助于ＡＤ的明确诊断     

21d头低位卧床中几种体液调节激素的变化

目的观察卧床模拟失重所致血浆肾素活性（ＰＲＡ）、醛固酮（Ａｌｄ）及前列腺素（ＰＧＩ２）的变化和ＬＢＮＰ对抗措施对上述激素的影响。方法１２名健康男性志愿者进行了２１ｄＨＤＴ－６°卧床实验。被试者年龄２３．７±５．０岁,随机等分为对照组（ＣＯＮ）和下体负压（ＬＢＮＰ）组。ＬＢＮＰ组在卧床最后一周进行下体负压锻炼（－３０ｍｍＨｇ,１ｈ／ｄ）。卧床前、卧床第２、４、１１天及卧床结束日清晨分别抽取肘静脉血。结果与卧床前相比,Ａｌｄ在第２天显著下降（ＣＯＮ－３０％,Ｐ＜０．０５;ＬＢＮＰ－３８％,Ｐ＜０．０１）,在第１１天显著上升（ＣＯＮ＋３０％,Ｐ＜０．０５;ＬＢＮＰ＋４８％,Ｐ＜０．０１）。ＰＲＡ在第４天达到峰值（Ｐ＜０．０５）,第２２天回落到低于对照水平。ＰＧＩ２在ＨＤＴ过程中均高于对照水平。对照组在第２２天增加＋２６０％（Ｐ＜０．０１）,ＬＢＮＰ组在第１１天,第２２天分别升高１４９％,１０２％（Ｐ＜０．０５）。采用ＬＢＮＰ对抗措施后,ＰＲＡ,Ａｌｄ在两组间无明显差别,ＰＧＩ２在ＬＢＮＰ组未进一步升高。结论２１ｄ头低位卧床导致ＰＲＡ、Ａｌｄ的一过性升高及ＰＧＩ２持续性升高。     

Alzheimer病与血管性痴呆的SPECT

目的：研究脑ＳＰＥＣＴ在诊断及鉴别Ａｌｚｈｅｉｍｅｒ病（ＡＤ）和血管性痴呆（ＶＤ）方面的作用。材料和方法：分别选择符合《精神障碍诊断和统计手册》第４版（ＤＳＭ—ＩＶ）中ＡＤ或ＶＤ诊断标准的患者各１７例和１２例，进行ＳＰＥＣＴ检查，兼作ＣＴ（或ＭＲＩ），并作神经心理测定及其它相关量表评分。将ＡＤ、ＶＤ和ＳＰＥＣＴ结果，以及ＳＰＥＣＴ和ＣＴ（或ＭＲＩ）的结果进行比较。结果：ＡＤ的ＳＰＥＣＴ以颞、顶叶低灌注为典型表现，ＶＤ以局灶性低灌注为主。在右颞下回和右枕叶，ＡＤ组ＳＰＥＣＴ放射性计数比值显著低于ＶＤ组（Ｐ＜０．０５，Ｐ＜０．０１），而在左顶叶显著高于ＶＤ组（Ｐ＜０．０５）。两组左半球的放射性计数比值普遍低于右半球，但ＶＤ的左右不对称性明显重于ＡＤ，以左顶叶最为突出（Ｐ＜０．０１）。ＭＲＩ结果与ＳＰＥＣＴ有较多的一致性。各量表评分除Ｈａｃｈｉｎｓｋｉ缺血指数外，均无显著差异。结论：ＳＰＥＣＴ在诊断和鉴别ＡＤ与ＶＤ方面有一定实用价值     

不同月经周期赛艇和短跑运动员性激素水平和运动能力的观察

通过测定浙江省13名女子赛艇运动员和12名女子短跑运动员卵泡期和黄体期的性激素水平、运动成绩及完成定量负荷运动后的血乳酸水平,观察不同项目女运动员不同月经周期激素水平和运动成绩的变化,以探讨不同月经周期与运动能力的关系。研究结果显示:女子赛艇和短跑运动员黄体期的孕酮(P)和睾酮(T)水平显著高于卵泡期(P<0.05);赛艇运动员黄体期促卵泡激素(FSH)水平显著高于卵泡期(P<0.05),而运动员黄体期和卵泡期的雌二醇(E2)和促黄体生成素(LH)水平则无显著性差异。赛艇运动员黄体期500m测功仪成绩显著优于卵泡期(P<0.01),而2000m测功仪成绩两期无显著性差异;短跑运动员黄体期100m、200m成绩均显著优于卵泡期(P<0.05,P<0.01)。定量负荷运动后,赛艇和短跑运动员黄体期的血乳酸水平均显著低于卵泡期(P<0.05,P<0.01)。结果表明,受试运动员黄体期机能状态较好,这可能与不同月经周期中激素水平变化以及在运动状态下各种激素间的协同效应有关。提示对女运动员的生理周期应给予充分重视。     

Effects of exercise training on the menstrual cycle: existence and mechanisms

This review evaluates the status of the evidence that exercise training affects the menstrual cycle beginning with evidence for the existence of delayed menarche, amenorrhea, and luteal suppression in athletes. A later age of menarche and a higher prevalence of amenorrhea and luteal suppression have been observed in athletes, but there is no experimental evidence that athletic training delays menarche, and alternative sociological and statistical explanations for delayed menarche have been offered. Cross-sectional studies of amenorrheic athletes have revealed abnormal reproductive hormone patterns, suggesting that the GnRH pulse generator in the hypothalamus is failing to initiate normal hypothalamic-pituitary-ovarian function. Longitudinal data show that the abrupt initiation of a high volume of aerobic training can disrupt the menstrual cycle in at least some women, but these women may be more susceptible to reproductive disruption than others, and some aspect of athletic training other than exercise (such as caloric deficiency) may be responsible for the observed disruption. Luteal suppression may be an intermediate condition between menstrual regularity and amenorrhea in athletes, or it may be the endpoint of a successful acclimation to exercise training. A potential endocrine mechanism of menstrual disruption in athletes involving the hypothalamic-pituitary-adrenal axis is discussed. Finally, promising future directions for research on this topic are described.     

女子篮球运动员运动能力与月经周期中性激素水平关系的研究

本研究通过监测１８名女子篮球运动员月经周期不同时相中进行大强度（５０分钟ＨＲ１８０～２００次／分）及中等强度（２小时ＨＲ１２０～１６０次／分）训练课后雌二醇（Ｅ２），孕酮（Ｐ），睾酮（Ｔ）及促卵泡激素（ＦＳＨ），黄体生成素（ＬＨ）水平的变化，探讨运动能力与性激素水平的关系。主要结果：大强度专项训练课后受试者血清Ｅ２，Ｐ水平在卵泡，黄体及月经期均明显升高；Ｔ表现为卵泡，黄体期升高，而月经期下降；ＦＳＨ仅在卵泡期升高；ＬＨ则在各期均未见显著改变。中等强度专项训练课后，Ｅ２，Ｐ，Ｔ及ＦＳＨ在各时相均明显升高，ＬＨ无明显变化。课后２４小时各种激素水平基本恢复至课前状态。结果提示：运动中女性激素的升高是机体对运动刺激出现的的一种自我保护性反应。女篮运动员机体运动能力与月经周期不同时相运动中性激素水平的变化密切相关。     

Bone density in female elite gymnasts: impact of muscle strength and sex hormones.

PURPOSE: The aim of this study was to investigate BMD in Danish female elite gymnasts and the relationships to maximal muscle strength, sex hormone concentrations, and menstrual status. METHODS: Six artistic gymnasts, five rhythmic gymnasts, and six controls aged 15-20 yr served as subjects. BMD (g x cm(-2)) of lumbar spine, proximal femur, distal radius, and whole body were measured by dual-energy x-ray absorptiometry (DXA) scanning. Maximal muscle strength (Nm) was measured in isokinetic trunk extension, trunk flexion, and knee extension. Serum concentrations of estrogen and progesterone in follicular and luteal phases were evaluated. RESULTS: Three out of six artistic gymnasts had amenorrhea, and two artistic and one rhythmic gymnast experienced oligomenorrhea. BMD in artistic gymnasts was greater than controls (24-45%, P < 0.05) in all sites except whole body. BMD in rhythmic gymnasts was greater than controls (4-26%, P < 0.05) in all sites except distal radius. In gymnasts, BMD correlated to both maximal muscle strength (0.60 < r < 0.85, P < 0.05) and serum progesterone (0.65 < r < 0.75, P < 0.05). CONCLUSION: In spite of oligomenorrhea or amenorrhea, it is possible for female gymnasts to maintain a high BMD in both the axial (L2-L4) and appendicular skeleton. The correlations between BMD and maximal muscle strength and progesterone concentration in gymnasts may indicate that within the same athletic group, progesterone concentration has a permissive role in bone formation, thus affecting the positive impact of muscle strength.     

Reproductive dysfunction in amenorrheic athletes and anorexic patients: a review

Strenuous athletic training and anorexia are associated with a high incidence of amenorrhea. While the physiological and/or psychological stressors that contribute to the development of menstrual dysfunction in these individuals appear to differ, they both involve disorders of the reproductive system that originate in the hypothalamus. The available data suggest that both groups experience alterations in the pulsatile release of GnRH, which in turn produces perturbations in pituitary and ovarian function ultimately leading to menstrual dysfunction. In this review, the reproductive and "stress" hormone profiles in amenorrheic athletes and anorexic patients are compared, and the interaction of these hormonal axes in the occurrence of menstrual dysfunction is discussed.     

Athletic amenorrhea: lack of association with body fat

The most commonly tested hypothetical cause of athletic amenorrhea has been low body fat. Test results have conflicted because of mixed groups of athletes and methodologic problems. In this study, we measured body fat only in distance runners (greater than 53 km X wk-1) of the same somatotype who clearly had regular menses or secondary amenorrhea; this permitted more valid group comparison of body fat using hydrostatic weighing. The regularly menstruating group (N = 7) had 12 periods X yr-1 at intervals of 26.5 +/- 1.0 (SE) days with a duration of 4.1 +/- 0.4 days. In the athletic amenorrhea group (N = 7), menstrual periods had been absent for 1 to 10 yr (average = 3.9 +/- 1.3 yr); they were gynecologically evaluated to restrict the group to those with athletic amenorrhea. The groups were similar in a number of categories: weight, height, age, menarcheal age, weekly training mileage, days/week training, years of training, and maximum oxygen uptake. Percent body fat for the two groups was the same: 17.7 +/- 2.1% for the amenorrheic athletes and 17.4 +/- 1.2% for the regularly menstruating athletes (P = 0.91). These data do not support the idea that low body fat per se causes athletic amenorrhea.     

Prevalence of menstrual dysfunction in Norwegian long-distance runners participating in the Oslo Marathon games

The objective of this study was to estimate the prevalence of athletic amenorrhea in a wide range of long-distance runners and the relation to possible risk factors. The study group consisted of 187 long-distance runners between 16 and 46 years of age. Information was obtained through a mailed questionnaire consisting of 32 different entries, including questions on age, leanness, training history, menstrual history, performance level, stress, as well as some sociological and nutritional aspects. Seventy-six per cent of the responding runners had normal menstrual function, 9.5% had minor irregularities (O), and 14.6% were amenorrheic (A), which is defined as absence of menstrual bleeding for more than 3 consecutive months the previous year. Half of the amenorrheic group had not had menstrual bleeding at all that year. The runners with menstrual disorders (O+A) had a significantly higher incidence of stress fractures. The most important factors associated with menstrual disorders were a feeling of conflict associated with food; age; and the age of menarche. There was no evidence that age of menarche was associated with an early training debut per se , the frequency and intensity of prepubertal training was not taken into account. All subgroups (E, O, and A) had low body mass index scores, and body composition did not seem to vary with menstrual status within the study group. Thus a high prevalence of menstrual disorders was observed in Norwegian long-distance runners, a condition associated with increased training loads, but even more with age, menarchal age and a feeling of nutritional conflict.     

Plasma proinsulin, C-peptide and sex hormone concentrations in regularly menstruating premenopausal females with ovulatory and anovulatory menstrual cycles

AIM: Highly active females are at risk of athletic menstrual irregularities including anovulatory menstrual cycles, oligomenorrhea and even amenorrhea. On the other hand, the functional relationship between endocrine pancreas and ovaries is supported by numerous studies indicating that disturbed female sex hormone secretion coexists with insulin resistance and glucose intolerance. However, the relationship between circulating beta islet and ovarian hormones in regularly menstruating active women with ovulatory and anovulatory menstrual cycle has not been studied. METHODS: A total of 32 regularly menstruating women participated in the study. Prospective subjects monitored their BBT for 3 months before the study. The determination of plasma progesterone levels between days 5-8 and again between days 19-22 of the menstrual cycles made possible the classification of subjects as ovulating or non-ovulating. Plasma 17-beta-estradiol, testosterone, insulin, proinsulin, C-peptide and glucose concentrations were assayed on the same menstrual cycle days as progesterone. RESULTS: There were no differences in circulating insulin, C-peptide and glucose between non-ovulating and ovulating women. In contrast, in non-ovulating subjects plasma proinsulin concentrations between days 19-22 were slightly, but significantly higher than between days 5-8 of the menstrual cycle (P<0.05). Exclusively in non-ovulating women significant and positive correlation was noted between circulating proinsulin and 17-beta-estradiol in data collected from both days 5-8 and 19-22 of the menstrual cycle (P<0.008). CONCLUSIONS: Our results indicate that in the face of low circulating progesterone and subsequent anovulation circulating 17-beta-estradiol slightly, but significantly, affect either pancreatic beta-cell biosynthetic activity or proinsulin hepatic and/or renal clearance.     

An effective, economic way of monitoring menstrual cycle hormones in at risk female athletes

PURPOSE: Female athletes, in response to intensive training, competition stress and a lean, athletic physique, are at increased risk of altered hypothalamic-pituitary ovarian (HPO) axis function associated with menstrual cycle disturbance and reduced secretion of the ovarian hormones estrogen and progesterone. Because there is evidence suggesting possible detrimental effects on skeletal health associated with deficiencies in these hormones, a suitable means to asses ovarian hormone concentrations in at risk athletes is needed. The aim of this study was to evaluate a simple, economical means to monitor the ovarian hormone production in athletes, in the setting of intensive training. METHODS: Subjects comprised 14 adolescent rowers, 12 lightweight rowers, and two groups of 10 matched control subjects. Ovarian function was monitored during the competition season by estimation of urinary excretion of estrone glucuronide (E1G) and pregnanediol glucuronide (PdG), enabling the menstrual cycles to be classified as ovulatory or anovulatory. RESULTS: Results indicated 35% and 75% of schoolgirl and lightweight rowers had anovulatory menstrual cycles, respectively. These findings were highlighted by significantly lower excretion of E1G and PdG during phases of intensive training in both the lightweight and schoolgirl rowers, compared with the control subjects. CONCLUSION: It was concluded that the urinary E1G and PdG assays were an effective means to assess the influence of intense training on ovarian hormone concentrations in at risk athletes. It is recommended that this technique be applied more widely as a means of early detection of athletes with low estrogen and progesterone levels, in an attempt to avoid detrimental influences on skeletal health.     

递增负荷运动过程中促性腺激素释放激素受体基因表达的变化

目的探讨运动性动情周期紊乱进程及恢复过程中雌性大鼠下丘脑-垂体-卵巢(HPO)轴各环节促性腺激素释放激素受体(GnRHR) mRNA水平变化的规律及意义。方法对不同训练周期及恢复过程的大鼠,采用RT-PCR检测其下丘脑、垂体、卵巢、子宫GnRHR mRNA的表达,采用液相平衡竞争放射免疫分析法检测其血清雌二醇(E2)、孕酮(P)水平。结果运动7周组大鼠下丘脑、垂体GnRHR mRNA表达及血清E2、P水平均显著降低(P<0.05~0.01);运动9周组大鼠下丘脑、垂体、卵巢GnRHR mRNA表达及血清E2、P水平均显著低于同期对照组(P<0.05~0.01);恢复2期组大鼠下丘脑、垂体GnRHR mRNA表达,血清E2及P水平仍低于同期对照组(P<0.05);恢复3期组大鼠E2、恢复4期组大鼠P水平及各运动及恢复组大鼠子宫GnRHR mRNA,与同期对照组相比均无显著性差异(P>0.05)。结果提示递增负荷运动大鼠HPO轴各环节GnRHR mRNA表达的变化与较低浓度的血清性腺类固醇水平,特别与E2水平密切相关,其表达水平的降低可能是运动性月经失调病理过程的重要一环。