共查询到18条相似文献，搜索用时 375 毫秒
1.
少年运动员递增负荷运动中血浆血管紧张素Ⅱ的变化初探 总被引：1，自引：0，他引：1
采用放射免疫法对１０名少年耐力运动员,在５０Ｗ、１５０Ｗ递增负荷运动中的血浆ＡｎｇⅡ含量进行了动态观察,并以血压（ＢＰ）,心率（ＨＲ）作为参照指标进行监测。结果表明：５０Ｗ、１５０Ｗ负荷运动末血浆ＡｎｇⅡ较安静状态分别上升２０％（Ｐ＞０．０５）、５３％（Ｐ＜０．００１）;ＢＰ、ＨＲ亦明显上升（均为Ｐ＜０．００１）。与对照组相比,在５０Ｗ、１５０Ｗ负荷运动末血浆ＡｎｇⅡ含量呈显著差异。提示：中等强度以上的耐力运动可促少年运动员血浆ＡｎｇⅡ合成释放显著增加 相似文献
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少年运动员递增负荷运动中血浆内皮素和心钠素的变化 总被引：2，自引：0，他引：2
为探讨运动条件下血浆内皮素、心钠素的变化及相互关系,采用放射免疫法对10名少年运动员,在50w、150w递增负荷运动中的血浆内皮素、心钠素含量进行了动态测定.结果表明血浆内皮素、心钠素的含量在50w负荷运动末较安静时分别上升8%、6%(均为P＞0.05);150w负荷运动末较安静时分别上升14%(P＞0.05)、15%(P＜0.05);与对照组相比,血浆内皮素、心钠素在各观察指标无显著差异.结合有关心功能指标提示中等强度的耐力运动是促血浆内皮素、心钠素释放的有效刺激. 相似文献
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目的:探讨递增负荷运动对50~59岁不同台阶指数人群血管机能的影响,为运动负荷试验提供科学的理论依据。方法:83名50~59岁成年人为研究对象,测试在逐级递增负荷运动中不同台阶指数人群心率、血压值,分析在不同负荷状态下不同台阶指数人群心血管机能变化的特征。结果:不同台阶实验指数人群在递增负荷运动中,血管机能指标变化趋势相同;不同台阶实验指数人群在负荷25W、50W、150W时,血管机能指标心率、舒张压有显著性差异。结论:50~59岁人群心肺功能较差者在运动健身时应注重控制运动负荷,防止心率、收缩压的过度升高,防止发生运动风险;台阶指数的优劣能否正确反映50~59岁人群血管机能有待进一步研究和探讨。 相似文献
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身体应变:少年男篮运动员与一般男少年的比较 总被引：4，自引：0，他引：4
受试者在跑台上进行递增负荷运动,并测量每级运动的心率。结果表明:少篮组运动前心率和各级运动的心率反应均比对照组明显低(P<0 05);少篮组各级运动的身体应变也比对照组明显低(P<0 05);少篮组完成工作量的绝对值(Mets)和相对体重表示的做功量的相对值(Mets·kg-1)均明显高于对照组(P<0 05)。 相似文献
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有氧运动对轻度原发性高血压的疗效及内皮功能的影响 总被引：1，自引：0，他引：1
郭科伟 《体育科技文献通报》2008,16(6):84-85
目的：观察有氧运动对轻度原发性高血压患者的疗效和内皮功能的影响。方法：40例轻度原发性局血压患者进行3个月的低强度有氧运动，用超声测定肱动脉内皮依赖性血管舒张功能（FMD）和非内皮依赖性血管舒张-即含服硝酸甘油时血管舒张功能（NTG—D），记录并比较运动前、后的血压、心率及FMD、NTG—D，并与36例健康体检者对照比较。结果：运动前轻度原发性高血压患者FMD明显下降，与对照组相比，P〈0．01，肱动脉基础内径和NTG～D差异无统计学意义（P〉0．05）；运动后轻度原发性高血压患者血压从（150．2±8．5）／（85．3±7．3）mmHg下降至（137．2±7．6）／（77．3±7．0）mmHg（P〈0．05），同时治疗后FMD较治疗前显著增加（P〈0．01）．但是与对照组比较差异仍有统计学意义（P〈0．05），运动前、后NTG—D无变化（P〉0．05）。结论：低强度有氧运动可降低轻度原发性高血压患者的血压，提高FMD，改善内皮功能。 相似文献
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少年运动员恒定负荷条件下血浆降钙素基因相关肽的变化 总被引：4，自引：0，他引：4
采用放射免疫法对 2 0名少年运动员 ,在 1 0 0W恒定负荷运动条件下的血浆降钙素基因相关肽 (CGRP)含量进行了测定。结果表明 :血浆CGRP含量在运动 30分钟后即刻较安静时上升 1 9% (P <0 .0 5) ;与对照组相比无显著差异 (P >0 .0 5)。结合有关心功能指标提示 :中等强度的耐力运动可使血浆CGRP含量显著增加 相似文献
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自行车运动时股四头肌与腓肠肌氧代谢和肌肉放电量相关性研究 总被引：4，自引：1，他引：3
王国祥 《西安体育学院学报》2004,21(1):47-50
为了揭示自行车运动时大腿和小腿肌群的氧代谢的特征及其肌肉活动量之间的关系,12名健康男子受试者在50、100、150、200、250W等5种负荷强度下,分别进行了6min的自行车踏蹬运动,并采用近红外线光谱和表面肌电图技术,对右侧下肢股四头肌和腓肠肌的氧合血红蛋白/肌红蛋白(oxy-Hb/Mb)与积分肌电图进行了连续性的同步测定。结果发现:股四头肌的oxy-Hb/Mb在50W至150W时下降比较缓慢,200W和250W时下降十分明显;iEMG在50W至150W时缓慢上升,200W和250W时迅速上升。腓肠肌的oxy-Hb/Mb50W至200W时缓慢下降,但在250W时发生快速下降现象;iEMG在50W至150W时缓慢上升,但在250W时则迅速增加。各负荷强度下股四头肌和腓肠肌的oxy-Hb/Mb与iEMG相互之间比较,分别具有明显的相关性。由此推测,运动中两肌的oxy-Hb/Mb整体水平变化及相互间差异,归结于运动时两肌的运动量和负担度。 相似文献
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目的：评价HiHiLo对运动员递增负荷运动过程中左心室功能的影响。方法：应用二维及Doppler超声心动图技术，分别于HiHiLo前后测量48名受试者心脏在递增负荷全过程中的泵功能指标、收缩功能指标及舒张功能指标。结果：与HiHiLo前相比，4周后受试者SV、SI从安静到递增负荷运动再到恢复的全过程中均有显著增加，但CO、CI与HiHiLo前相比，均显著减少；ESV、VAo-max、ET较之HiHiLo前分别在50W、50w至150W、150W至恢复的过程中有显著减小，但EF在安静至100W过程中较HiHiLo前有显著性增大；E、A、HR在运动全过程中都较HiHiLo前有显著下降，但E／A并无变化，其他指标仅在运动过程中的某一两个阶段较HiHiLo前有显著变化，如EDV、EAT、EDT。结论：4周HiHiLo后受试者的左心室泵功能在递增负荷全过程中均有显著改善，主要表现为舒张功能的明显增强，而收缩功能变化并不明显。 相似文献
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少年运动员恒定负荷条件下血浆血管紧张素Ⅱ和心钠素的变化及相互关系 总被引：1，自引：0，他引：1
为探讨运动条件下血浆血管紧张素Ⅱ、心钠素的变化及相互关系,作者采用放射免疫法对３０名少年运动员在１００Ｗ恒定负荷运动条件下的血浆血糖紧张素Ⅱ、心钠素含量进行了动态测定。结果表明：血浆血管紧张素Ⅱ、心钠素的含量在运动１５分钟时较安静状态分别上升２２％（Ｐ＜０．０１）和１０％（Ｐ＞０．０５）;运动３０分钟后即刻较安静时分别上升５６％（Ｐ＜０．００１）和１６％（Ｐ＜０．００１）。与对照组相比,血浆血管紧张素在各观察指标呈显著差异。结合有关心功能指标提示：中等强度的耐力运动可使心血管组织合成释放血浆血管紧张素Ⅱ,心钠素显著增加。 相似文献
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The relationships between exercise intensity, heart rate, and blood pressure during an incremental isometric exercise test 总被引：1，自引：0，他引：1
Currently, it is not possible to prescribe isometric exercise at an intensity that corresponds to given heart rates or systolic blood pressures. This might be useful in optimizing the effects of isometric exercise training. Therefore, the aim of this study was to explore the relationships between isometric exercise intensity and both heart rate and systolic blood pressure during repeated incremental isometric exercise tests. Fifteen participants performed seated isometric double-leg knee extension, during which maximum voluntary contraction (MVC) was assessed, using an isokinetic dynamometer. From this, a corresponding peak electromyographic activity (EMG(peak)) was determined. Subsequently, participants performed two incremental isometric exercise tests (at least 48 h apart) at 10, 15, 20, 25, and 30% EMG(peak), during which steady-state heart rate and systolic blood pressure were recorded. In all participants, there were linear relationships between %EMG(peak) and heart rate (r at least 0.91; P < 0.05) and between %EMG(peak) and systolic blood pressure (r at least 0.92; P < 0.05). Also, when repeated tests were compared, there were no differences in the slopes (P > 0.50) or elevations (P > 0.10) for either of the relationships. Therefore, these linear relationships could be used to identify isometric exercise training intensities that correspond to precise heart rates or systolic blood pressures. Training performed in this way might provide greater insight into the underlying mechanisms for the cardiovascular adaptations that are known to occur as a result. 相似文献
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There is evidence to suggest that perception of exertion during exercise is based on both local and central sensations. The aim of the present experiment was to determine the relative contributions of diff erent sensations to overall perceived exertion during cycling. Eighteen trained cyclists pedalled on a cycle ergometer for 4 min at each of three work rates (100, 150 and 200 W) and cadences (50, 70 and 90 rev. min-1). At the end of each bout, they used Borg's category-ratio (CR-10) scale to rate their overall perceived exertion, leg muscle pain, knee pain, breathlessness and heart beat intensity. The results indicated that cadence only influenced local sensations (muscle pain and knee pain), which were significantly higher at slower pedalling rates. Neither overall perceived exertion nor central sensations (breathlessness and heart beat intensity) were significantly affected by cadence. In contrast, increases in work rate were associated with higher ratings for all sensations. Further analyses revealed that variations in these overall ratings of perceived exertion as a function of work rate were accounted for by variations in ratings of muscle pain and breathlessness. The general implication is that perceived exertion during cycling derives from a combination of muscle and respiratory sensations. 相似文献
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There is evidence to suggest that perception of exertion during exercise is based on both local and central sensations. The aim of the present experiment was to determine the relative contributions of different sensations to overall perceived exertion during cycling. Eighteen trained cyclists pedalled on a cycle ergometer for 4 min at each of three work rates (100, 150 and 200 W) and cadences (50, 70 and 90 rev x min(-1)). At the end of each bout, they used Borg's category-ratio (CR-10) scale to rate their overall perceived exertion, leg muscle pain, knee pain, breathlessness and heart beat intensity. The results indicated that cadence only influenced local sensations (muscle pain and knee pain), which were significantly higher at slower pedalling rates. Neither overall perceived exertion nor central sensations (breathlessness and heart beat intensity) were significantly affected by cadence. In contrast, increases in work rate were associated with higher ratings for all sensations. Further analyses revealed that variations in these overall ratings of perceived exertion as a function of work rate were accounted for by variations in ratings of muscle pain and breathlessness. The general implication is that perceived exertion during cycling derives from a combination of muscle and respiratory sensations. 相似文献
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Biochemical markers of inflammation are emerging as new predictors of risk of cardiovascular disease (CVD) and may alter acutely with exercise. Few studies have been conducted on the effects of walking on these markers or whether different walking intensities elicit varied effects. As there is growing interest in modifiable lifestyle factors such as walking to reduce CVD risk, these inflammatory responses warrant investigation. The aim of this study was to compare the effects of walking at 50% versus 70% of predicted maximal heart rate on C-reactive protein (CRP), plasma fibrinogen, and triglycerides in sedentary post-menopausal women. Twelve post-menopausal women (mean age 58 years, s +/-6; stature 1.62 m, s+/-0.06; body mass 66.8 kg, s +/-6.2) completed two 30-min treadmill walks in a randomized cross-over design. Fasted blood samples were taken (for the determination of plasma fibrinogen, CRP, and lipids) before, immediately after, and 1 and 24 h after exercise. Triglyceride concentrations decreased from pre-exercise to 24 h post exercise at both walking intensities (time x group interaction, P < 0.05). No significant effects were observed for plasma fibrinogen, CRP, total cholesterol, low-density or high-density lipoprotein cholesterol (time x group interaction, P > 0.05). The results of this study suggest that fasting plasma triglycerides are decreased on the morning after 30 min of brisk walking at either 50% or 70% of maximal heart rate (moderate and vigorous intensity). 相似文献
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Jillian Davis Marie Murphy Tom Trinick Ellie Duly Alan Nevill 《Journal of sports sciences》2013,31(3):303-309
Abstract Biochemical markers of inflammation are emerging as new predictors of risk of cardiovascular disease (CVD) and may alter acutely with exercise. Few studies have been conducted on the effects of walking on these markers or whether different walking intensities elicit varied effects. As there is growing interest in modifiable lifestyle factors such as walking to reduce CVD risk, these inflammatory responses warrant investigation. The aim of this study was to compare the effects of walking at 50% versus 70% of predicted maximal heart rate on C-reactive protein (CRP), plasma fibrinogen, and trigylcerides in sedentary post-menopausal women. Twelve post-menopausal women (mean age 58 years, s ± 6; stature 1.62 m, s ± 0.06; body mass 66.8 kg, s ± 6.2) completed two 30-min treadmill walks in a randomized cross-over design. Fasted blood samples were taken (for the determination of plasma fibrinogen, CRP, and lipids) before, immediately after, and 1 and 24 h after exercise. Triglyceride concentrations decreased from pre-exercise to 24 h post exercise at both walking intensities (time×group interaction, P < 0.05). No significant effects were observed for plasma fibrinogen, CRP, total cholesterol, low-density or high-density lipoprotein cholesterol (time x group interaction, P > 0.05). The results of this study suggest that fasting plasma triglycerides are decreased on the morning after 30 min of brisk walking at either 50% or 70% of maximal heart rate (moderate and vigorous intensity). 相似文献
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运动对大鼠血浆vWF和ET的影响 总被引：3，自引：0，他引：3
为了研究力竭性运动及其不同负荷的运动训练对大鼠血管内皮细胞内分泌功能的影响,通过对大鼠进行力竭性运动试验以及进行为期8 w的不同负荷的游泳训练,测定血浆vWF和ET含量。结果表明,急性力竭性运动可能导致机体缺血、缺氧以及心血管内皮细胞的损伤引起血浆vWF和ET含量显著升高;中、小负荷的运动训练可以降低内皮细胞ET的分泌,而大负荷的运动训练可以促进内皮细胞ET的分泌,但是不同负荷的运动训练均使血浆vWF含量显著升高,其机制有待于进一步研究。 相似文献