普通运动员急性和慢性间歇性缺氧暴露运动时脑血流速度...【精品推荐-doc】
普通运动员急性和慢性间歇性缺氧暴露运动时脑血流速度的变化
(摘要)
研究生: 梁丽娟 指导教师: 熊开宇副教授
研究目的: 观察急性缺氧和慢性缺氧1—4周运动时脑血流速度变化的一般规律,为高住低训法提供一定的理论依据。
研究方法:8名体育系男生每天在相当于2500米高原的常压低氧屋缺氧暴露10小时,连续4周。测定了急性缺氧暴露、慢性缺氧暴露1周末、2周末、3周末和4周末中等固定强度功率自行车运动时安静、运动5分、运动10分、运动15分和运动后即刻经颅多普勒(TCD)参数及动脉血氧饱和度,呼出气氧气和二氧化碳百分含量,血红蛋白。
结论:
1. 安静状态急性缺氧5分到20分平均脑血流速度持续上升,提示脑循环对
急性缺氧的应答超过20分。
2. 急性缺氧时舒张期血流速度的增加是脑血流量增加的主要原因。
3. 急性缺氧运动时机体还未能做出有效的通气应答以抵御组织缺氧和运
动缺氧的双重缺氧刺激,仅依赖脑血流速度的变化不足以满足急性缺
氧运动时脑血流量增加的需要。
4. 间歇性低氧暴露1周对低氧运动时脑血流速度变化的影响最为深刻。
5. 间歇性低氧暴露4周中等强度运动时脑血流速度相对于安静值百分比
的变化随暴露周数的延长
表
关于同志近三年现实表现材料材料类招标技术评分表图表与交易pdf视力表打印pdf用图表说话 pdf
现为上下波动的特点,暴露1周末和暴露3
周末的百分比值处于低点,暴露2周末和暴露4周末百分比值为高点。
关键词:脑血流,经颅多普勒,高住低训,低氧暴露,中等固定强度运动
Velocity of CBF of common athletes with moderate constant exercise during
acute and chronic intermittent hypoxic exposure
(Abstract)
Graduate student:LiangLijuan Instructor:XiongKaiyu
PURPOSE:The purpose of this study was to investigate the effects of intermittent hypoxic exposure using normobaric hypoxic house on velocity of cerebral blood flow with moderate constant exercise so as to provide some theory for living high-training
low .
METHODOLOGY: Eight sea-level native males exposed to normobaric hypoxic house 10 hours every day for 4 weeks. The cerebral blood flow(CBF) velocity with moderate constant ergometer cycling exercise was measured by transcranial Doppler at rest ,exercise 5 min ,exercise 10 min ,exercise 15 min and after exercise instantly during normoxia, acute hypoxia and the 4-week chronic intermittent hypoxic exposure. Arterial saturation oxygen, the percent content of O2 and CO2 of the expired gas, hemoglobin (Hb), Hct were also measured.
CONCLUSION:
1. The mean velocity of CBF increased continually during acute exposure,
indicating the response time of cerebral circulation to acute hypoxia
exceeded 20 min;
2. The increase of CBF is caused by Vd mainly duting acute hypoxia.
3. The body cannot develop effective ventilatory response to depend the double
hypoxic stimulus of environmental hypoxia and kinetic hypoxia during acute
hypoxic exercise.
4. The velocity of CBF with exercise during 1wk intermittent hypoxia is most
profoundly affected.
5. The percent of velocity of CBF with moderate constant exercise compared
with the rest value during 4-week intermittent hypoxic exposure fluctuated
with the extension of exposure week. The percent values of Exposure 1 wk
and exposure 3 wk were low, and the percent values of Exposure 2 wk and
exposure 4 wk were high.
Key words: cerebral blood flow, Transcranial Doppler, living high-training low,
hypoxic exposure, moderate constant exercise