运动对女性体内激素水平的影响

运动训练会影响人体内分泌系统的功能,并明显改变体内某些激素的水平,有关运动与激素关系的研究越来越受到重视。本文就短期和长期运动对女性体内某些激素水平的影响进行了综述。     

人工内分泌系统研究综述

内分泌系统作为生物体内的三大系统之一,有着极其重要的信息处理机制,包括高层调节机制、情感反馈机制和激素反应机制等.生物内分泌系统有着自学习、自适应、自协同等特性.从人工内分泌系统的发展过程对其进行概迹,探讨了人工内分泌系统目前的应用,对这一新的智能研究方向进行了展望.提出探讨性的发展方向.     

激素对驱蚊香草增殖过程中部分生理特性的影响

研究了BA和NAA处理组合对驱蚊香草增殖过程中糖和蛋白质含量的影响,结果表明: BA和NAA与BA互作对糖含量有极显著效应.而处理时间对蛋白质含量表现极显著差异.随着培养时间的延长蛋白质含量明显下降.说明继代周期不宜长,驱蚊香草增殖较适宜的培养基为:MS NAA0.4～0.8mg/L BA2.0～4.0mg/L.     

Effects of chromium nanoparticle dosage on growth,body composition,serum hormones and tissue chromium in Sprague-Dawley rats

This 6-week study was conducted to evaluate the effects of seven different levels of dietary chromium (Cr) (0, 75, 150,300, 450, 600, and 1200 ppb Cr) in the form of Cr nanoparticle (CrNano) on growth, body composition, serum hormones and tissue Cr in Sprague-Dawley (SD) rats. Seventy male SD rats (average initial body weight of (83.2±4.4) g) were randomly assigned to seven dietary treatments (n=10). At the end of the trial, body composition was assessed via dual energy X-ray absorptiometry (DEXA). All rats were then sacrificed to collect samples of blood, organs and tissues for determination of serum hormones and tissue Cr contents. The results indicated that lean body mass was significantly increased (P＜0.05) due to the addition of 300 and 450 ppb Cr from CrNano. Supplementation of 150, 300, 450, and 600 ppb Cr decreased (P＜0.05) percent body fat significantly. Average daily gain was increased (P＜0.05) by addition of 75, 150, and 300 ppb Cr and feed efficiency was increased (P＜0.05) by supplementation of 75, 300, and 450 ppb Cr. Addition of 300 and 450 ppb Cr decreased (P＜0.05) the insulin level in serum greatly. Cr contents in liver and kidney were greatly increased (P＜0.05) by the addition of Cr as CrNano in the dosage of from 150 ppb to 1200 ppb. In addition, Supplementation of 300, 450, and 600 ppb Cr significantly increased (P＜0.05) Cr content in the hind leg muscle. These results suggest that supplemental CrNano has beneficial effects on growth performance and body composition, and increases tissue Cr concentration in selected muscles.     

运动训练与女性激素水平的改变

通过了解国内外有关运动训练对女性激素水平的影响的研究成果,掌握该领域的研究现状和动态。研究表明,运动训练影响下丘脑—垂体—卵巢轴和下丘脑—垂体—肾上腺轴的功能活动,运动训练也导致诸多肽类物质参与女性激素水平的调节     

高效液相色谱法测定化妆品中四种雌激素

目的:建立反相高效液相色谱法同时测定化妆品中的4种雌激素(雌酮、雌三醇、炔雌醇、己烯雌酚)的方法。方法:色谱柱Inertsil ODS-C18(4.6 mm×250 mm,5μm),流动相为甲醇-水(体积比为60:40),流速1mL/min,检测波长279nm,柱温:25℃。结果:4种雌激素成分在0.05～500μg/mL浓度范围内与其对应分峰面积线性关系良好。样品的平均加标回收率为97.3%～110.6%,RSD为2.9%～4.0%,化妆品中四种雌激素的检出限为0.02～0.03mg/kg。该方法操作简便、灵敏度高,能够同时检测化妆品中4种雌性激素的含量。     

The time course of the human growth hormone response to a 6 s and a 30 s cycle ergometer sprint

Exercise is a potent stimulus for the release of human growth hormone (hGH), but the time course of the hGH response to sprint exercise has not been studied. The aim of the present study was to determine the time course of the hGH response to a 6 s and a 30 s maximal sprint on a cycle ergometer. Nine males completed two trials, on one occasion performing a single 6 s sprint and on another a single 30 s sprint. They then rested on a couch for 4 h while blood samples were obtained. Three of the participants completed a further control trial involving no exercise. Metabolic responses were greater after the 30 s sprint than after the 6 s sprint. The highest measured mean serum hGH concentrations after the 30 s sprint were more than 450% greater than after the 6 s sprint (18.5 - 3.1 vs 4.0 - 1.5 w g·l -1 , P ? 0.05). Serum hGH also remained elevated for 90-120 min after the 30 s sprint compared with ~ 60 min after the 6 s sprint. There was a large inter-individual variation in the hGH response to the 30 s sprint. In the control trial, serum hGH concentrations were not elevated above baseline at any time. It would appear that the duration of a bout of maximal sprint exercise determines the magnitude of the hGH response, although the mechanism for this is still unclear.