Hemodynamics during active and passive recovery from a single bout of supramaximal exercise
Hemodynamics during active and passive recovery from a single bout of supramaximal exercise
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DOI：
10.1007/s00421-003-0796-4
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发表时间：
2003-04-01
影响因子：
3
通讯作者：
Concu, A
中科院分区：
文献类型：
--
作者：
Crisafulli, A;Orrù, V;Concu, A
这项工作的目的是研究在两种模式的恢复过程中心血管反应的差异[主动（AR）：在40 W的踏板;和被动（PR）：完全休息坐着]从一个回合的超大运动。8名男性业余足球运动员进行了两次超大循环测力计测试，每次测试包括对阻力相当于150%的最大工作量达到在以前的增量测试，然后随机分配AR或PR。使用阻抗心电图仪获得的动态变量。受试者还连接到血压计，用于收缩压和舒张压，并连接到代谢计用于氧摄取（（V）超过点O-2）评估。我们测量了：心率（HR）、每搏输出量（SV）、心输出量（CO）、计算为射血前期/左心室射血时间比（PEP/LVET）的心肌收缩力的倒数、平均血压（MBP）、作为中心血容量指数的胸电阻抗（Z（0））和动静脉氧差（A-V 02 Diff.）。与AR相比，PR引起的CO较低[平均值（SE）：7（0.7）vs. 10.4（0.6）l.min（-1）（在恢复的第5分钟），由于HR较低[106.2（3.6）与121.8恢复期第5分钟时为（4.5）bpm]，SV [67.1（5）vs. 86.1（4.8）ml，和PEP/VET值[0.44（0.007）vs. 0.39（0.015），在恢复的第5分钟]。PR和AR之间的MBP和Z（0）无差异[在恢复的第5分钟分别为95.1（1.9）vs. 92.3（2.7）mmHg和26.2（1.1）vs. 26.6（1）Ω]，而A-V O-2 Diff. AR期间的值高于PR期间[在恢复的第5分钟为108.8（4.3）vs. 75.2（5.4）ml.l（-1）]。因此，尽管在单次超极量运动后，PR期间的SV和CO低于AR期间，但这些差异不是由于心血管功能受损，而是由较少的肌肉参与导致来自机械感受器和中枢命令的刺激减少，从而导致心肌收缩力和HR更快地恢复到静息值来充分解释。
The aim of this work was to study the differences in cardiovascular response during two modes of recovery [active (AR): pedalling at 40 W; and passive (PR): complete rest seated] from a single bout of supramaximal exercise. Eight male amateur soccer players underwent two supramaximal cycle-ergometer tests, each consisting of pedalling against a resistance equivalent to 150% of the maximum workload achieved in a previous incremental test, followed by randomly assigned AR or PR. Cardiodynamic variables were obtained using an impedance cardiograph. Subjects were also connected to a sphygmomanometer, for systolic and diastolic blood pressure, and to a metabolimeter for oxygen uptake ((V) over dot O-2) assessments. We measured: heart rate (HR), stroke volume (SV), cardiac output (CO), the inverse of myocardial contractility calculated as pre-ejection period/left ventricular ejection time ratio (PEP/LVET), mean blood pressure (MBP), thoracic electrical impedance (Z(0)) as an index of central blood volume, and arterio-venous oxygen difference (A-V 02 Diff.). PR caused a lower CO compared to AR [mean (SE): 7 (0.7) vs. 10.4 (0.6) l.min(-1) at the 5th min of recovery] due to lower HR [106.2 (3.6) vs. 121.8 (4.5) bpm at the 5th min of recovery], SV [67.1 (5) vs. 86.1 (4.8) ml at the 5th min of recovery], and PEP/VET values [0.44 (0.007) vs. 0.39 (0.015) at the 5th min of recovery]. No differences were found in MBP and Z(0) between PR and AR [95.1 (1.9) vs. 92.3 (2.7) mmHg and 26.2 (1.1) vs. 26.6 (1) Omega respectively at the 5th min of recovery], while A-V O-2 Diff. values were higher during AR than during PR [108.8 (4.3) vs. 75.2 (5.4) ml.l(-1) at the 5th min of recovery]. Thus, although after a single bout of supramaximal exercise SV and CO are lower during PR than during AR, these differences are not due to an impairment of cardiovascular function, but are fully explained by the lesser muscular engagement that leads to a reduction in stimuli deriving from mechanoreceptors and central commands, thus causing a faster return of myocardial contractility and HR to resting values.