koko体育app

欢迎来到《koko体育app 学报(医学版)》
袁斗, 谭琛, 姚建民, 等. 耐力训练对兔心房颤动的影响及机制探索[J]. koko体育app 学报(医学版), 2020, 51(2): 213-218. DOI:
引用本文: 袁斗, 谭琛, 姚建民, 等. 耐力训练对兔心房颤动的影响及机制探索[J]. koko体育app 学报(医学版), 2020, 51(2): 213-218. DOI:
YUAN Dou, TAN Chen, YAO Jian-min, et al. Effects of Continuous Training on the Induction of Atrial Fibrillation in a Rabbit Model[J]. Journal of Sichuan University (Medical Sciences), 2020, 51(2): 213-218. DOI:
Citation: 𒉰 YUAN Dou, TAN Chen, YAO Jian-min, et al. Effects of Continuous Training on the Induction of Atrial Fibrillation in a Rabbit Model[J]. Journal of Sichuan University (Medical Sciences), 2020, 51(2): 213-218. DOI:

耐力训练对兔心房颤动的影响及机制探索

Effects of Continuous Training on the Induction of Atrial Fibrillation in a Rabbit Model

  • 摘要:
      目的  通过耐力运动训练兔动物模型探索运动相关性心房颤动(AF)的发生机制。
      方法  36只新西兰大耳兔随机分为对照组、中强度耐力训练组、高强度耐力训练组(每组12只):对照组不做任何耐力训练处理;耐力运动训练组每周训练5 d,每天1 h或一次性力竭(不足1 h),共持续16 周(中强度耐力训练组:坡度0度,速度15 m/min;高强度耐力训练组:坡度0度,速度30 m/min)。训练完成后,各组随机各取6只,共18只兔采用离体心脏Langendorff系统进行灌流,将1 μmol/L乙酰胆碱(Ach)+不同浓度的氯化钡(BaCl2)溶液(0、0.1、0.5、1、3、6 μmol/L)灌入冠脉内,开始持续给药过程中电生理指标的测定及记录。在左心耳置入的电极分别记录相应的心房有效不应期(AERP)及90%动作电位时程(APD90)、并给予心脏期前程序刺激(S1S2)诱发房颤,记录并计算房颤发生率。灌流完后剪取兔左心房,经实时荧光定量(qRT)-PCR 技术检测心房肌组织内向整流钾电流/通道(IK1kir2.1、kir2.2、胶原蛋白Ⅰ和胶原蛋白Ⅲ的mRNA表达量。取各组剩余6只实验兔,共18只取左心房组织标本, 应用Masson 染色进行组织学检查,测定心肌组织胶原容积分数。
      结果  长期高强度的运动训练16周后,不同组间,Ach背景相同,BaCl2剂量相同作用下,随着运动强度的增加,APD90、AERP相应缩短, 房颤发生率增加,BaCl2 取0~6 μmol/L时,高强度耐力训练组与其余两组间比较差异均有统计学意义(P<0.001),而其余两组之间差异无统计学意义。同一组内,Ach背景相同,随着BaCl2剂量的增加,APD90、AERP相应延长,房颤发生率降低,3组组内比较,差异均有统计学意义(P<0.05)。随着运动量的增加,兔左心房kir2.1、kir2.2、胶原蛋白Ⅰ和胶原蛋白Ⅲ的 mRNA表达量均增加,胶原容积分数增加,高强度耐力训练组>中强度耐力训练组>对照组,差异有统计学意义(P<0.05)。
      结论  长期的高强度耐力运动训练可通过增加实验兔心房组织纤维化程度、心肌细胞IK1数量和(或)功能,改变心电传导,促使实验兔房颤发生和维持。
     
    Abstract:
      Objective  This study was aimed to assess mechanisms underlying continuous training induced atrial fibrillation (AF) in an animal model.
      Methods  Healthy New Zealand rabbits were divided into three groups (n=12 each): control group (C), moderate intensity group (M), and high intensity group (H). The intensity of continuous training was adjusted according to the treadmill speed. After 12 weeks of training, with a Langendorff perfusion system, AF was induced by S1S2 stimulation and the incidence was recorded. Changes in atrial kir2.1, kir2.2, type Ⅰ and Ⅲ collagen protein mRNA expressions were assessed by quantitative real-time PCR. Masson staining was used to assess the extracellular collagen volume fraction (CVF) .
      Results  After 12 weeks, comparing with group C, groups M and H had greater (P<0.05): CVF, incidence of AF (P<0.05, also between Groups H and M), and atrial inward rectifier potassium current/channel (IK1) . In Group H, kir2.1, kir2.2, type Ⅰ and Ⅲ collagen protein mRNA expressions in the left atrium were increased (P<0.05, compared with Groups C and M).
      Conclusion   Long-term and high-intensity treadmill running could increase AF incidence in rabbits.
     
© 2020 《koko体育app 学报(医学版)》编辑部 版权所有 cc

开放获取🥀 本文遵循知识共享署名—非商业性使用4.0国际许可协议(CC BY-NC 4.0),允许第三方对本刊发表的论文自由共享(即在任何媒介以任何形式复制、发行原文)、演绎(即修改、转换或以原文为基础进行创作),必须给出适当的署名,提供指向本文许可协议的链接,同时标明是否对原文作了修改;不得将本文用于商业目的。CC BY-NC 4.0许可协议详情请访问

/

返回文章
返回
var _hmt = _hmt || []; (function() { var hm = document.createElement("script"); hm.src = "https://hm.baidu.com/hm.js?90c4d9819bca8c9bf01e7898dd269864"; var s = document.getElementsByTagName("script")[0]; s.parentNode.insertBefore(hm, s); })(); !function(p){"use strict";!function(t){var s=window,e=document,i=p,c="".concat("https:"===e.location.protocol?"https://":"http://","sdk.51.la/js-sdk-pro.min.js"),n=e.createElement("script"),r=e.getElementsByTagName("script")[0];n.type="text/javascript",n.setAttribute("charset","UTF-8"),n.async=!0,n.src=c,n.id="LA_COLLECT",i.d=n;var o=function(){s.LA.ids.push(i)};s.LA?s.LA.ids&&o():(s.LA=p,s.LA.ids=[],o()),r.parentNode.insertBefore(n,r)}()}({id:"K9y7iMpaU8NS42Fm",ck:"K9y7iMpaU8NS42Fm"}); koko体育-koko体育app koko体育-koko体育网页版koko体育app koko体育-全站app下载(官网) m6米乐app|下载 m6米乐app|主頁欢迎您!!