Vastus lateralis fatigue alters recruitment of musculus quadriceps femoris in humans
Vastus lateralis fatigue alters recruitment of musculus quadriceps femoris in humans
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DOI：
10.1152/japplphysiol.00267.2001
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发表时间：
2002-02-01
影响因子：
3.3
通讯作者：
Meyer, RA
中科院分区：
文献类型：
--
作者：
Akima, H;Foley, JM;Meyer, RA
本研究验证了一个假设，即在膝关节伸展运动（KEE）中，股四头肌（QF）的单个成员的疲劳会改变其他三块肌肉的使用。六名男子进行KEE与左QF在负载等于50%的4 × 10的重复最大。随后，电肌肉刺激（EMS），旨在刺激和疲劳的左m。股外侧肌（VL），应用30分钟。EMS后，立即重复的KEE。横向弛豫时间（T2）加权磁共振成像之前和之后的每一回合的KEE和EMS的3和30分钟，以评估使用和刺激，分别，QF。在第一次KEE后，QF肌肉中的每一个的T2增加8-13%。EMS期间，VL组T2增加（P < 0.05）更多（10%），而M组T2下降（P < 0.05）至KEE前水平。股内侧肌（VM）和股内侧肌（M.股直肌（RF）。在某种程度上，M。刺激股中间肌，而不刺激VM和RF，从而从第一回合KEE中恢复。等长扭矩最初为最大自主扭矩的30%，在3 min和30 min时分别降至13%和7%。第二次KEE后T2大于第一次（P < 0.05），尤其是VM和RF的增加。这些结果表明，受试者能够进行第二回合，通过更多地使用其他QF肌肉，VL的贡献很小。最简单的解释是增加了对QF的中央指挥，这样即使其中一个协同者严重疲劳，也可以完成预期的行动。
This study tested the hypothesis that fatigue of a single member of musculus quadriceps femoris (QF) would alter use of the other three muscles during knee extension exercise (KEE). Six men performed KEE with the left QF at a load equal to 50% of the 4 x 10 repetitions maximum. Subsequently, electromyostimulation (EMS), intended to stimulate and fatigue the left m. vastus lateralis (VL), was applied for 30 min. Immediately after EMS, subjects repeated the KEE. Transverse relaxation time (T2)-weighted magnetic resonance images were taken before and after each bout of KEE and at 3 and 30 min of EMS to assess use and stimulation, respectively, of the QF. T2 of each of the QF muscles was increased 8-13% after the first KEE. During EMS, T2 increased (P < 0.05) even more in VL (10%), whereas it decreased (P < 0.05) to pre-KEE levels in m. vastus medials (VM) and m. rectus femoris (RF). The VL and, to some extent, the m. vastus intermedius were stimulated, whereas the VM and RF were not, thereby recovering from the first bout of KEE. Isometric torque, initially 30% of maximal voluntary, was reduced to 13% at 3 min and 7% at 30 min. T2 was greater (P < 0.05) after the second than the first bout of KEE, especially the increase for the VM and RF. These results suggest that subjects were able to perform the second bout with little contribution of the VL by greater use of the other QF muscles. The simplest explanation is increased central command to the QF such that the intended act could be accomplished despite acute fatigue of one of its synergists.