Tucci J T, Carpenter D M, Pollock M L, Graves J E, Leggett S H
Center for Exercise Science, College of Medicine, University of Florida, Gainesville.
Spine (Phila Pa 1976). 1992 Dec;17(12):1497-501. doi: 10.1097/00007632-199212000-00009.
To investigate the effect of reduced frequency of training and detraining on lumbar extension strength, 50 subjects (34 men, aged 34 +/- 11 yrs; and 16 women, aged 33 +/- 11 yrs) were recruited from ongoing strength training programs. Initial training consisted of 10 or 12 weeks of variable resistance lumbar extension strength exercise to volitional fatigue 1, 2, or 3 times a week. After the initial training, subjects reduced the frequency of training to once every 2 weeks (n = 18) or once every 4 weeks (n = 22) for 12 weeks. Only the frequency of training was changed; the mode, volume, and intensity of exercise remained constant for both reduced frequency of training groups. An additional ten subjects terminated training and acted as controls (detraining group). Isometric lumbar extension strength was evaluated at seven angles through a 72 degree range-of-motion before training, after training, and after reduced frequency of training or detraining. Analysis of variance with repeated measures indicated that lumbar extension strength improved (P < or = 0.05) for all groups after the initial 10 or 12 weeks of training. After 12 weeks of reduced training, the once every 2 weeks and once every 4 weeks groups showed no significant reduction in lumbar extension strength at any angle tested, whereas the detraining group demonstrated an average 55% reduction in strength. These findings indicate that isometric lumbar extension strength can be maintained for up to 12 weeks with a reduced frequency of training as low as once every 4 weeks when the intensity and the volume of exercise are maintained.
为研究训练频率降低和停止训练对腰椎伸展力量的影响，我们从正在进行的力量训练项目中招募了50名受试者（34名男性，年龄34±11岁；16名女性，年龄33±11岁）。初始训练包括10或12周的可变阻力腰椎伸展力量练习，每周进行1、2或3次，直至达到意志性疲劳。初始训练后，受试者将训练频率降低至每2周1次（n = 18）或每4周1次（n = 22），持续12周。仅改变训练频率；两个训练频率降低组的运动方式、运动量和强度保持不变。另外10名受试者停止训练并作为对照组（停止训练组）。在训练前、训练后以及训练频率降低或停止训练后，通过72度的运动范围在七个角度评估等长腰椎伸展力量。重复测量方差分析表明，在最初的10或12周训练后，所有组的腰椎伸展力量均有所提高（P≤0.05）。在训练频率降低12周后，每2周1次和每4周1次的组在任何测试角度下腰椎伸展力量均未出现显著下降，而停止训练组的力量平均下降了55%。这些结果表明，当运动强度和运动量保持不变时，训练频率低至每4周1次，等长腰椎伸展力量最多可维持12周。
