A mechanism for increased contractile strength of human pennate muscle in response to strength training:: changes in muscle architecture
A mechanism for increased contractile strength of human pennate muscle in response to strength training:: changes in muscle architecture
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DOI：
10.1111/j.1469-7793.2001.t01-1-00613.x
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发表时间：
2001-07-15
影响因子：
5.5
通讯作者：
Simonsen, EB
中科院分区：
文献类型：
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作者：
Aagaard, P;Andersen, JL;Simonsen, EB
1.在人类羽状肌中，由训练或不活动引起的解剖横截面积（CSA）或体积的变化可能不一定反映生理CSA的变化，从而反映最大收缩力的变化，因为肌纤维羽角也可能同时发生变化。11名男性受试者进行了14周的下肢肌肉重阻力力量训练。在训练前后，采用磁共振成像（MRI）测量股四头肌的解剖CSA和体积，超声测量股外侧肌（VL）的肌纤维扇形角（theta（p）），并在VL穿刺活检获取肌纤维CSA（CSA（fibre））.随着训练，解剖肌肉CSA和体积分别从77.5 +/- 3.0增加到85.0 +/- 2.7 cm（3）和1676 +/- 63增加到1841 +/- 57 cm（3）。VL羽状角从8.0 +/- 0.4增加到10.7 +/- 0.6度，CSA（纤维）从3754 +/- 271增加到4238 +/- 202 μ m（2）。等长股四头肌力量从282.6 +/- 11.7增加到327.0 +/- 12.4 Nm.4.θ（p）与训练前四头肌体积呈正相关（r = 0.622）。多因素回归分析显示，当θ（p）和CSA（纤维）相结合（R = 0.728）更强的关系。训练后CSA（纤维）的增加与四头肌体积的增加有关（r = 0.749）。肌球蛋白重链（MHC）亚型分布（I型和II型）保持不变的训练。观察到VL肌纤维羽角增加，以响应阻力训练。这使得单根肌纤维CSA和最大收缩强度增加（+16%）超过解剖肌肉CSA和体积（+10%）。7.总的来说，目前的数据表明，人类羽状肌的形态，结构和收缩能力是相互关联的，在体内。这种相互作用似乎包括由强化阻力训练引起的特定适应反应。
1. In human pennate muscle, changes in anatomical cross-sectional area (CSA) or volume caused by training or inactivity may not necessarily reflect the, change in physiological CSA, and thereby in maximal contractile force, since a simultaneous change in muscle fibre pennation angle could also occur.2. Eleven male subjects undertook 14 weeks of heavy-resistance strength training of the lower limb muscles. Before and after training anatomical CSA and volume of the human quadriceps femoris muscle were assessed by use of magnetic resonance imaging (MRI), muscle fibre pennation angle (theta (p)) was measured in the vastus lateralis (VL) by use of ultrasonography, and muscle fibre CSA (CSA(fibre)) was obtained by needle biopsy sampling in VL.3. Anatomical muscle CSA and volume increased with training from 77.5 +/- 3.0 to 85.0 +/- 2.7 cm(3) and 1676 +/- 63 to 1841 +/- 57 cm(3), respectively Furthermore, VL pennation angle increased 2 from 8.0 +/- 0.4 to 10.7 +/- 0.6 deg and CSA(fibre) increased from 3754 +/- 271 to 4238 +/- 202 mum(2). Isometric quadriceps strength increased from 282.6 +/- 11.7 to 327.0 +/- 12.4 Nm.4. A positive relationship was observed between theta (p) and quadriceps volume prior to training (r = 0.622). Multifactor regression analysis revealed a stronger relationship when theta (p) and CSA(fibre) were combined (R = 0.728). Post-training increases in CSA(fibre) were related to the increase in quadriceps volume (r = 0.749).5. Myosin heavy chain (MHC) isoform distribution (type I and II) remained unaltered with training.6. VL muscle fibre pennation angle was observed to increase in response to resistance training. This allowed single muscle fibre CSA and maximal contractile strength to increase more (+16 %) than anatomical muscle CSA and volume (+10 %). 7. Collectively, the present data suggest that the morphology, architecture and contractile capacity of human pennate muscle are interrelated, in vivo. This interaction seems to include the specific adaptation responses evoked by intensive resistance training.