CHANGES IN FORCE, CROSS-SECTIONAL AREA AND NEURAL ACTIVATION DURING STRENGTH TRAINING AND DETRAINING OF THE HUMAN QUADRICEPS
CHANGES IN FORCE, CROSS-SECTIONAL AREA AND NEURAL ACTIVATION DURING STRENGTH TRAINING AND DETRAINING OF THE HUMAN QUADRICEPS
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DOI：
10.1007/bf02388334
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发表时间：
1989-11-01
影响因子：
3
通讯作者：
CERRETELLI, P
中科院分区：
文献类型：
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作者：
NARICI, MV;ROI, GS;CERRETELLI, P
四名年龄在23-34岁的男性受试者在60天的单侧力量训练和40天的停训期间进行了研究。训练每周进行四次，由六个系列的10个最大等速膝盖伸展组成，角速度为2.09弧度。s-1条件下在训练和停训的开始和每20天，通过核磁共振成像，在训练（T）和未训练（UT）的腿上测量股骨长度（Lf）的7个分数处的等长最大自主收缩（MVC）、综合肌电图活动（iEMG）和四头肌横截面积（CSA）。30 °等速扭矩在训练前和训练结束时测量完全膝关节伸展前的：0，1.05，2.09，3.14，4.19，5.24 rad. cm。s-1条件下60天后，T腿CSA增加了8.5%。1.4%（平均值±）SEM，n = 4，p < 0.001），iEMG为42.4% ±。16.5%（p < 0.01），MVC降低20.8%。5.4%（p < 0.01）。停训期间的变化与训练期间的变化具有相似的时间过程。未观察到UT腿CSA的变化，而iEMG和MVC增加了24.8%。10%（未标明）和8.7%。+-。4.3%（未登记），分别股四头肌CSA的增加在2/10 Lf时最大（12.0% ± 0.01）。1.5%，p < 0.01）和最小，近膝，在8/10 L（3.5% ± 0.01）。1.2%，N.S.）。与股直肌和股外侧肌相比，股内侧肌和中间肌优先肥大。T腿等速扭矩增加20.9%。5.4%（p < 0.05），23.8% ±。7.8%（p < 0.05）和22.5% ±。在0、1.05和2.09 rad. cntdot下为6.7%（p < 0.05）。s-1;在较高速度和UT腿中未观察到显著变化。由力量训练产生的肥大占力量增加的40%，而剩余的60%似乎可归因于神经驱动的增加和肌肉结构的变化。
Four male subjects aged 23-34 years were studied during 60 days of unilateral strength training and 40 days of detraining. Training was carried out four times a week and consisted of six series of ten maximal isokinetic knee extensions at an angular velocity of 2.09 rad .cntdot. s-1. At the start and at every 20th day of training and detraining, isometric maximal voluntary contraction (MVC), integrated electromyographic activity (iEMG) and quadriceps muscle cross-sectional area (CSA) assessed at seven fractions of femur length (Lf), by nuclear magnetic resonance imaging, were measured on both trained (T) and untrained (UT) legs. Isokinetic torques at 30.degree. before full knee extension were measured before and at the end of training at: 0, 1.05, 2.09, 3.14, 4.19, 5.24 rad .cntdot. s-1. After 60 days T leg CSA had increased by 8.5% .+-. 1.4% (mean .+-. SEM, n = 4, p < 0.001), iEMG by 42.4% .+-. 16.5% (p < 0.01) and MVC by 20.8% .+-. 5.4% (p < 0.01). Changes during detraining had a similar time course to those of training. No changes in UT leg CSA were observed while iEMG and MVC increased by 24.8% .+-. 10% (N.S.) and 8.7% .+-. 4.3% (N.S.), respectively. The increase in quadriceps muscle CSA was maximal at 2/10 Lf (12.0% .+-. 1.5%, p < 0.01) and minimal, proximally to the knee, at 8/10 L of (3.5% .+-. 1.2%, N.S.). Preferential hypertrophy of the vastus medialis and intermedius muscles compared to those of the rectus femoris and lateralis muscles was observed. Isoangular torque of T leg increased by 20.9% .+-. 5.4% (p < 0.05), 23.8% .+-. 7.8% (p < 0.05) and 22.5% .+-. 6.7% (p < 0.05) at 0, 1.05 and 2.09 rad .cntdot. s-1 respectively; no significant change was observed at higher velocities and in the UT leg. Hypertrophy produced by strength training accounts for 40% of the increase in force while the remaining 60% seems to be attributable to an increased neural drive and possibly to changes in muscle architecture.