Influence of priming exercise on muscle deoxy[Hb+Mb] during ramp cycle exercise
Influence of priming exercise on muscle deoxy[Hb+Mb] during ramp cycle exercise
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DOI：
10.1007/s00421-011-2068-z
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发表时间：
2012-03-01
影响因子：
3
通讯作者：
Bourgois, Jan
中科院分区：
文献类型：
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作者：
Boone, Jan;Bouckaert, Jacques;Bourgois, Jan
本研究的目的是通过评估先前高强度运动后的特征变化，更好地了解增量运动期间乙状结肠脱氧模式[Hb + Mb]的机制。10名身体活跃的学生分别进行了两次增量坡道（25 W min(-1)）练习（AL和LL），其中一次是增量手臂（10 W min(-1)），另一次是增量腿部运动（25 W min(-1)），作为参考测试（RT）。通过近红外光谱测量脱氧[Hb + Mb]，并在整个运动过程中记录股外侧肌表面肌电图。将Deoxy[Hb + Mb]、综合肌电图和中位工频（MdPF）表示为工作速率(W)的函数，并在练习之间进行比较。在RT和AL脱氧期间[Hb + Mb]随工作速率呈s型增加。然而，在LL脱氧期间[Hb + Mb]从斜坡运动开始立即增加，因此不再遵循s型模式。与对照组（5.0 +/- 2.1%）和对照组（3.9 +/- 3.2%）相比，对照组（0.89 +/- 0.11% W-1；对照组：0.74 +/- 0.08% W-1；对照组：0.72 +/- 0.10% W-1）的iEMG/ w关系斜率更大，而对照组的MdPF（17.2 +/- 4.5%）下降更明显。我们观察到，在斜坡运动之前进行启动腿部运动时，脱氧的乙状体模式[Hb + Mb]受到干扰。由于脱氧[Hb + Mb]的差异伴随着肌电图的差异，因此可以认为肌纤维募集是斜坡运动中脱氧[Hb + Mb]模式的重要潜在机制。
The aim of the present study was to gain better insight into the mechanisms underpinning the sigmoid pattern of deoxy[Hb + Mb] during incremental exercise by assessing the changes in the profile following prior high-intensity exercise. Ten physically active students performed two incremental ramp (25 W min(-1)) exercises (AL and LL, respectively) preceded on one occasion by incremental arm (10 W min(-1)) and on another occasion by incremental leg exercise (25 W min(-1)), which served as the reference test (RT). Deoxy[Hb + Mb] was measured by means of near-infrared spectroscopy and surface EMG was recorded at the Vastus Lateralis throughout the exercises. Deoxy[Hb + Mb], integrated EMG and Median Power Frequency (MdPF) were expressed as a function of work rate (W) and compared between the exercises. During RT and AL deoxy[Hb + Mb] followed a sigmoid increase as a function of work rate. However, during LL deoxy[Hb + Mb] increased immediately from the onset of the ramp exercise and thus no longer followed a sigmoid pattern. This different pattern in deoxy[Hb + Mb] was accompanied by a steeper slope of the iEMG/W-relationship below the GET (LL: 0.89 +/- 0.11% W-1; RT: 0.74 +/- 0.08% W-1; AL: 0.72 +/- 0.10% W-1) and a more pronounced decrease in MdPF in LL (17.2 +/- 4.5%) compared to RT (5.0 +/- 2.1%) and AL (3.9 +/- 3.2%). It was observed that the sigmoid pattern of deoxy[Hb + Mb] was disturbed when the ramp exercise was preceded by priming leg exercise. Since the differences in deoxy[Hb + Mb] were accompanied by differences in EMG it can be suggested that muscle fibre recruitment is an important underlying mechanism for the pattern of deoxy[Hb + Mb] during ramp exercise.