共查询到17条相似文献，搜索用时 171 毫秒
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对体育系男学生(20名)在安静状态、小于通气阈强度负荷运动后即刻1min的脑电变化进行测试得出结论：小于通气阈强度运动在一定程度上对大脑皮质产生影响，增进了大脑细胞新陈代谢强度，可改善大脑皮质神经元代谢能力，可改善和提高脑皮层神经细胞工作能力。 相似文献
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不同无氧阈评价方法的比较研究 总被引：2，自引：0，他引：2
通过不同的无氧阈检测方法检测无氧阈指标出现的时间顺序,并对出现无氧阈时各相关指标进行相关性分析,以探讨不同无氧阈之间的关系。让8名赛艇运动员在ConceptⅡ风轮式赛艇测功仪上进行递增负荷测试,每级负荷3 min,直至力竭,同时测试每级负荷后的血乳酸,全程记录肌电以及气体代谢量,并做相关分析。结果表明：1）肌电阈、通气阈和乳酸阈3种无氧阈指标出现的时间依次为8 min 58 s、9 min 22 s和9 min 48 s;2）肌电阈、通气阈和乳酸阈依次出现的时间差均不超过30 s,并且通气阈和乳酸阈之间无显著性差异（P〉0.05）。3种无氧阈依次出现的原因是快肌纤维的快速动员引起了乳酸急剧增加,进而在转运到血液中时首先引起酸碱缓冲对的中和,当强度进一步增加时,产生的乳酸大大超过了乳酸的清除能力,进而引起血乳酸急剧增加。 相似文献
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白建超 《山东体育学院学报》2008,24(7)
通过对男子散打运动员和普通男子大学生递增负荷运动过程中气体代谢与通气阈关系的实验研究，发现散打运动训练可有效改善血液的流变性，提高红细胞的变形性，降低红细胞的聚集性和血液的粘度，减小内环境变化对血液流变性造成的不良影响，且通气阈摄氧量与血液流变性密切相关，其相关关系与运动训练水平有关。 相似文献
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通过测试10名体育专业学生在正常与模拟1 000、1 500 m低氧环境下进行递增负荷运动中气体代谢、血乳酸等指标变化,观察低氧对机体乳酸阅和通气阈的影响.结果显示:1)三种环境下,通气阈分别是:(720.0±71.8)s、(631.1±60.1)s、(616.0±40.0)s;乳酸阈时间是(826.67±72.11)s、(816.00±94.66)s、(744.00±94.66)s.2)随着氧分压的降低,通气阈均早于乳酸阈出现,通气阈和乳酸阈时各指标的绝对值下降,但其百分比值变化不大.3)正常环境下,乳酸阈和通气阈的相关性系数r>0.65(P<0.05),但模拟1 000 m与模拟1 500 m相关性系数r<0.60(P>0.05).结论:1)通气阈和乳酸阈的指标及其百分比值可以用来衡量或评价运动训练效果、指导运动训练;2)进入较高海拔后,应适当调整运动强度,以适应环境的变化. 相似文献
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目的:探讨运动所致的视觉诱发电位改变是否是由于体温改变所致,VEP改变是否与运动强度存在依从性.方法:采用NDI-200(海神号)神经电检诊仪记录受试者(n=8)进行功率车(Monark 839E)增量运动(起始负荷为25 w,递增负荷量为25 w/挡,每挡运动10分钟,转数为50 rpm)前(安静状态)、近无氧阈强度运动(心率为130 b/min左右、RPE值为13左右)后即刻、近无氧间强度运动待体温恢复至安静状态后、近极量强度有氧运动(心率为180 b/min左右、RPE值为18左右)后即刻、近极量强度有氧运动待体温恢复后的视觉诱发电位.结果:与安静状态相比,在近无氧闽强度运动后即刻,P100潜伏期即呈现极显著性缩短(P<0.01),近无氧阚强度运动待体温恢复后仍保持显著缩短(P=0.059);近极量强度有氧运动后即刻显著缩短(P<0.05),近极量强度有氧运动待体温恢复后仍然保持显著缩短(P<0.05).近无氧阈强度运动后即刻及近极量强度有氧运动后即刻P100潜伏期之间并无显著性差异(P>0.05).结论:P100潜伏期对近无氧阈强度及近极量强度有氧运动有一定的敏感性,运动是不依赖于体温改变而对VEP P100潜伏期产生影响的因素之一,运动对P100潜伏期的影响并不存在有强度依从性. 相似文献
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采用常规脑电检测法,研究不同运动量的24式简化太极拳对女大学生脑电α波的影响。结果发现,经过9周太极拳运动后,对照组女大学生心理调节呼吸、3分钟过度换气后的α频段功率值均显著低于运动组女大学生,而意念表象中的α频段功率值未见显著性差异。结果表明,太极拳训练对中枢神经的刺激能引起神经细胞产生良好的生理适应,可以在一定程度上影响中枢神经系统,使大脑皮质神经元代谢强度增加,可改善大脑皮质神经元代谢能力。 相似文献
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该研究旨在观察乳酸阈强度训练提升超重女大学生心肺机能和改善身体成分的效果。方法：通过递增负荷实验测定超重女大学生个体乳酸阈，绘制血乳酸-走跑强度动力曲线，依此确定运动干预强度及设计运动方案；受试者进行12周乳酸阈强度运动训练；测定实验前后身体成分、肺活量、最大摄氧量、超声心动等指标进行与对照组的对比分析。结果显示：超重女大学生个体乳酸阈为3.75±0.91mmol/L，乳酸阈强度为6.91±0.88km/h，乳酸阈强度训练靶心率为137±12.2次/min；实验组训练后，体脂%、腹部脂肪含量等非常显著的下降，最大摄氧量、肺活量、每博输出量、射血分数显著性提升；对照组无明显变化。结论：12周乳酸阈强度运动锻炼可显著改善超重女大学生的心肺机能和身体成分；本研究得出的乳酸阈强度可作为超重女大学生有氧健身的参考强度。 相似文献
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不同速度运动后大鼠骨骼肌氧化还原状态的变化及乳酸阈的形成 总被引：2，自引：0，他引：2
本研究的目的在于观察不同速度运动后大鼠骨骼肌氧化还原状态的变化及其与乳酸阈形成之间的关系。通过测定不同速度运动后 SD 大鼠骨骼机 NADH 和 NAD 含量变化发现,低强度运动后 NADH下降,中等强度运动后又升高,肌乳酸均有少量增加。在乳酸阈速度时,NADH 含量和 NADH/NAD 比值呈现出迅速增加的趋势。由此得出结论:中等强度运动后 NADH 含量升高主要是线粒体内 NADH 发生改变;肌肉 NADH/NAD 比值的变化对乳酸阈的形成是极其重要的调节因素。在中强度时细胞即开始向还原状态转变,可能对加速乳酸的积累和乳酸阈的形成具重要意义。 相似文献
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递增工作强度运动时个体无氧阈最大速度的选取及与RPE等级值的关系 总被引：1，自引：0，他引：1
张立 《武汉体育学院学报》1998,(2)
本文研究证明,乳酸阈和通气阈双重拐点结合可作为判断VIATmax的简单可靠方法;较高VO2max相对值和较低心率可使受试者以更快VIAT-max运动而不伴随更多乳酸水平上升;RPE等级值与HLmax、VO2max速度、HRmax和VO2max相关提示RPE受上述生理因素影响。 相似文献
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目的:通过对体育学院大学生进行为期一周的间歇性低氧刺激,观察刺激前后递增负荷运动心率、通气量、摄氧量及定量负荷时血乳酸的变化,探讨间歇性低氧刺激对人体最大摄氧量及通气阈的影响。方法:本实验分两个阶段,每阶段做两次运动负荷。12名体育系男生在实验室常氧条件下在跑台上采用Bruce方法进行递增负荷运动至力竭。间隔3天后进行75%最大摄氧量的定量负荷运动,运动时间为9min,定量负荷后立即进行连续7天,每天1h的12%~10%O2的常压间歇性低氧刺激。低氧刺激完成后第二天再次进行上述两种运动方案。在极限递增负荷至力竭运动前后分别测定心率(HR)、递增负荷至力竭时间(t)、最大摄氧量(VO2max%)、血乳酸(Bla)及定量负荷时Bla等指标。结果:(1)低氧刺激后,递增负荷至力竭运动时HRmax增加(P0.01),VEmax上升(P0.01),呼吸商(R)增加(P0.05),t明显延长(P0.05),Bla明显增加(P0.05),定量负荷运动Bla显著降低(P0.05);(2)间歇性低氧刺激后通气阈时,HR、VE、VO2max%、HRmax%均显著性变化(P0.05),其中VE、VO2max%低氧刺激前后差异非常显著(P0.01)。结论:经过间歇性低氧刺激,受试者在进行递增负荷的力竭性运动时运动时间明显延长,心率在运动后增加,人体通气阈时相对应的心率百分数、最大摄氧量百分比、肺通气量均明显提高,这表明人体有氧耐力和极限负荷运动能力均得到增强。 相似文献
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Leonardo A. Pasqua Salomão Bueno Guilherme G. Artioli Antônio H. Lancha JR. Monique Matsuda Mônica V. Marquezini 《Journal of sports sciences》2016,34(2):163-170
The purpose of this study was to verify the association between ACTN3 polymorphism and physiological parameters related to endurance performance. A total of 150 healthy male volunteers performed a maximal incremental running test to determine the speeds corresponding to ventilatory threshold (VT) and respiratory compensation point (RCP). Participants were genotyped and divided into terciles based on the analysed variables. Genotype frequencies were compared through χ2 test between lower and higher terciles, with the lowest or highest values of each analysed variable. ACTN3 XX genotype was over-represented in higher tercile for VT and RCP. Odds ratio also showed significantly higher chances of XX individuals to be in higher tercile compared to RR (7.3) and RR + RX (3.5) for VT and compared to RR genotype (8.1) and RR + RX (3.4) for RCP. Thus, XX individuals could attain the VT and RCP at higher speeds, suggesting that they are able to sustain higher running speeds in lower exercise intensity domains. It could result in higher lipid acids oxidation, saving muscle glycogen and delaying the fatigue during prolonged exercises, which could be the advantage mechanism of this genotype to endurance performance. 相似文献
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《European Journal of Sport Science》2013,13(9):1221-1229
AbstractFirst and second ventilatory thresholds (VT1 and VT2) represent the boundaries of the moderate-heavy and heavy-severe exercise intensity. Currently, VTs are primarily detected visually from cardiopulmonary exercise test (CPET) data, beginning with an initial data screening followed by data processing and statistical analysis. Automated VT detection is a challenging task owing to the high signal to noise ratio typical of CPET data. Recurrent neural networks describe a machine learning form of Artificial Intelligence that can be used to uncover complex non-linear relationships between input and output variables. Here we proposed detection of VTs using a single neural network classifier, trained with a database of 228 laboratory CPET data. We tested the neural network performance against the judgement of 7 couples of board-certified exercise-physiologists on 25 CPET tests. The neural network achieved expert-level performances across the tasks (mean absolute error was 9.5% (r?=?0.79) and 4.2% (r?=?0.94) for VT1 and VT2, respectively). Estimation errors are compatible with the typical error of the current gold standard visual methodology. The neural network demonstrated VT detecting and exercise intensity level classifying at a high competence level. Neural networks could potentially be embedded in CPET hardware/software to extend the reach of exercise physiologists beyond their laboratories. 相似文献
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有氧代谢能力与耐力项目训练中运动强度的选择 总被引：2，自引：1，他引：2
全面阐述了有氧代谢能力的概念，提出了最大摄氧量、无氧阈、最大摄氧量平台的持续时间都应是耐力训练的目标。在此基础上讨论了发展此3项目标应采用的训练强度。 相似文献
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Yukio Fujita Keisuke Koizumi Saori Sukeno Motomu Manabe Jun Nomura 《Journal of sports sciences》2013,31(11):1145-1151
Abstract The effects of active recovery using previously active and inactive muscle groups on power output and respiratory responses were examined. Ten male volunteers underwent two exhaustive 40-s bouts of leg cycling (1st Ex and 2nd Ex), separated by a 20-min recovery period. The recovery conditions were leg (Leg-Active) or arm (Arm-Active) cranking at 50% ventilatory threshold (VT), or sedentary control (Passive). The total output work (Total work) during the 2nd Ex in the Leg-Active condition was significantly higher than that in the Passive (299 vs. 282 J · kg body mass?1 (J · BM?1)). The values of Total work, peak [Vdot]O2 and peak heart rate during the 2nd Ex were significantly higher than those during the 1st Ex in both Leg- and Arm-Active. Total CO2excess after the 1st Ex was significantly higher than that after the 2nd Ex (67.6 vs. 26.0 ml · BM?1) in Passive. After the 2nd Ex, the Total CO2excess in the Leg-Active (51.5 ml · BM?1) was significantly higher than that in both the Passive (26.0) and Arm-Active (36.5), with Arm-Active being significantly higher than Passive. The recovery exercise using previously inactive muscles improved respiratory compensation ability related to performance enhancement. 相似文献
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Cristine Lima Alberton Stephanie Santana Pinto Gabriela Neves Nunes Douglas Guerreiro dos Santos Rau Paula Finatto Amanda Haberland Antunes 《European Journal of Sport Science》2017,17(8):1013-1020
The aim of the present study was to compare the peak anterior–posterior (Fy) and medio–lateral (Fx) ground reaction forces (GRFs) of women performing stationary running at different intensities in aquatic and dry land environments. Fourteen young women performed the stationary running exercise at three cadences (first ventilatory threshold, second ventilatory threshold and maximum effort, as determined during exercise in water) in aquatic and dry land environments. Two-way repeated measures ANOVA was used to analyse the data (α?=?.05). As a result, significantly lower peak Fy anterior, Fy posterior, Fx medial and Fx lateral values were observed for the aquatic environment, except for the Fy posterior at the first ventilatory threshold. Significant differences were observed between cadences in the peak Fy anterior, Fy posterior, Fx medial and Fx lateral values, with higher values for the cadence corresponding to maximum effort compared to the first ventilatory threshold, except for the Fy posterior and Fx medial in the aquatic environment. The results indicate that the horizontal GRFs are reduced in the aquatic environment and depend on the intensity of stationary running exercise performance. 相似文献