STRUCTURAL-CHANGES IN SKELETAL-MUSCLE TISSUE WITH HEAVY-RESISTANCE EXERCISE
STRUCTURAL-CHANGES IN SKELETAL-MUSCLE TISSUE WITH HEAVY-RESISTANCE EXERCISE
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DOI：
10.1055/s-2008-1025748
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发表时间：
1986-06-01
影响因子：
2.5
通讯作者：
HOPPELER, H
中科院分区：
文献类型：
--
作者：
LUTHI, JM;HOWALD, H;HOPPELER, H
肌力，肌肉横截面积，纤维大小，纤维类型分布，毛细血管，和线粒体体积之前和之后6周的重阻力运动估计。膝伸肌的等速扭矩产生增加了17.6%，主要是在前半段的训练期间。股外侧肌的横截面积增加了8.4%，主要是在训练期的后半段。形态测定的纤维大小，纤维类型分布，并从股外侧肌活检毛细血管没有改变显着的训练，同样，内，外线粒体膜的表面密度以及肌原纤维的体积密度保持不变。与此相反，线粒体的体积密度下降了9.6%。然而，由于总肌肉体积的增加，计算的线粒体的绝对体积保持不变，而肌原纤维的绝对体积增加了10%。它的结论是，在以前未经训练的年轻男性受试者的短时间的力量训练不改变线粒体的超微结构组成和线粒体的明显稀释可以定量占肌原纤维体积的增加。
Muscle strength, muscle cross-sectional area, fiber size, fiber type distribution, capillarity, and mitochondrial volume were estimated before and after 6 weeks of heavy-resistance exercise. Isokinetic torque production of the knee extensor muscles increased by a total of 17.6%, mainly during the first half of the training period. The cross-sectional area of the vastus lateralis muscle increased by 8.4%, mainly during the second half of the training period. Morphometrically determined fiber size, fiber type distribution, and capillarity from biopsies of vastus lateralis did not change significantly with training, Likewise, the surface densities of inner and outer mitochondrial membranes as well as the volume density of myofibrils remained unchanged. In contrast, the volume density of mitochondria decreased by 9.6%. However, due to the increase in total muscle volume, the calculated absolute volume of mitochondria remained constant, whereas the absolute volume of myofibrils increased by 10%. It is concluded that strength training of short duration in previously untrained young male subjects does not change the ultrastructural composition of mitochondria and that the apparent dilution of mitochondria can quantitatively by accounted for by the increase in myofibrillar volume.