Heterogeneity of muscle deoxygenation kinetics during two bouts of repeated heavy exercises
Heterogeneity of muscle deoxygenation kinetics during two bouts of repeated heavy exercises
复制标题
两次重复剧烈运动期间肌肉脱氧动力学的异质性
DOI：
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发表时间：
2010
影响因子：
3
通讯作者：
P. Mucci
中科院分区：
文献类型：
--
作者：
F. Prieur;S. Berthoin;A. Marles;N. Blondel;P. Mucci
本研究考察了先前大强度运动对大强度自行车运动开始时肌肉去氧动力学的空间分布的影响。未经训练的年轻成年男性(n=16)进行连续两次大强度周期运动，每次6min，间隔6min，在35W时，用近红外光谱仪连续监测股四头肌8个部位的肌肉脱氧情况。先前的大运动量减少了HHb升高前的延迟(9±2比5±2)S；P<；(0.001)。8个场地的TD HHB的标准差随着运动前的表现而降低(1.1%±10.5vs.0.8%±0.40%，S：P<；；%0.05)。S第二轮运动前10分钟的HHb一过性下降幅度小于第一轮(0.6±0.6比0.3±0.3，P<0.01)。这一下降的标准差也通过先前的锻炼而减少(0.5±100.3比0.3±0.2A.U；P<0.01)。最后，先前的运动显著降低了对应于肺$$Dot{V}$$O2慢成分的时间段内HHb上升的标准差。这些结果表明，先前的大负荷运动降低了大负荷运动开始初期和肺慢氧成分形成过程中肌肉脱氧动力学的空间异质性。这表明，肌肉中氧/氧传递比的分布因运动前的表现而得到改善。
This study examines the effect of prior heavy exercise on the spatial distribution of muscle deoxygenation kinetics at the onset of heavy-intensity cycling exercise. Young untrained male adults (n = 16) performed two consecutive bouts of 6 min of high intensity cycle exercise separated by 6 min at 35 W. Muscle deoxygenation (HHb) was monitored continuously by near-infrared spectroscopy at eight sites in the quadriceps. Prior heavy exercise reduced the delay before the increase in HHb (9 ± 2 vs. 5 ± 2 s; P < 0.001). The standard deviation of TD HHb of the eight sites was decreased by the performance of prior exercise (1.1 ± 0.5 vs. 0.8 ± 0.4 s; P < 0.05). The transient decrease in HHb during the first 10 s of exercise was less during the second bout than during the first bout (0.6 ± 0.6 vs. 0.3 ± 0.3 A.U.; P < 0.01). The standard deviation of this decrease was also reduced by prior exercise (0.5 ± 0.3 vs. 0.3 ± 0.2 A.U.; P < 0.01). Lastly, prior exercise decreased significantly the standard deviation of the HHb rise during the time period corresponding to the pulmonary $$ dot{V} $$O2 slow component. These results indicate that prior heavy exercise reduced the spatial heterogeneity of muscle deoxygenation kinetics at the early onset of heavy exercise and during the development of the pulmonary $$ dot{V} $$O2 slow component. It indicates that the distribution of the $$ dot{V} $$O2/O2 delivery ratio within muscle was improved by the performance of a prior exercise.
运动期间的局部灌注和代谢需求：一种无创 MRI 评估方法。
DOI：
10.1152/jappl.2001.91.4.1845
发表时间：
2001
期刊：
Journal of applied physiology (Bethesda, Md. : 1985)
影响因子：
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作者：
Richardson,RS;Haseler,LJ;Nygren,AT;Bluml,S;Frank,LR
通讯作者：
Frank,LR