Côté C, Simoneau J A, Lagassé P, Boulay M, Thibault M C, Marcotte M, Bouchard C
Physical Activity Sciences Laboratory, Laval University, Ste.-Foy, PQ, Canada.
Arch Phys Med Rehabil. 1988 Apr;69(4):281-5.
Sedentary subjects were submitted to repeated concentric isokinetic strength training protocols separated by a 50-day detraining period. Peak torque output of the quadriceps muscle group increased by 54% after the first ten-week training protocol. No significant changes in mean skeletal muscle fiber area were observed while a significant increase in percent fiber type and percent fiber area was noticed for type IIa fibers. The activities of the enzymes hexokinase, malate dehydrogenase, 3-hydroxyacyl CoA dehydrogenase, and oxoglutarate dehydrogenase were also increased significantly. Fifty days without training induced a significant decline in peak torque output. All the enzymes that responded to the first training protocol maintained their elevated activities over the detraining period except for the enzyme oxoglutarate dehydrogenase. A second training protocol administered to the same subjects following the 50-day inactivity period did not result in any significant increase in maximum torque output and fiber area. It is concluded that the isokinetic strength training protocol used can increase the functional capacity of skeletal muscle, but this effect does not appear to be related to skeletal muscle fiber hypertrophy.
久坐不动的受试者接受了重复的同心等速力量训练方案，中间间隔50天的停训期。在第一个为期十周的训练方案后，股四头肌组的峰值扭矩输出增加了54%。未观察到平均骨骼肌纤维面积有显著变化，而IIa型纤维的纤维类型百分比和纤维面积百分比显著增加。己糖激酶、苹果酸脱氢酶、3-羟酰基辅酶A脱氢酶和草酰戊二酸脱氢酶的活性也显著增加。50天不训练导致峰值扭矩输出显著下降。除草酰戊二酸脱氢酶外，所有对第一个训练方案有反应的酶在停训期都保持其升高的活性。在50天不活动期后对同一受试者进行的第二个训练方案并未导致最大扭矩输出和纤维面积有任何显著增加。得出的结论是，所使用的等速力量训练方案可以增加骨骼肌的功能能力，但这种效果似乎与骨骼肌纤维肥大无关。
