Braith R W, Graves J E, Leggett S H, Pollock M L
Center for Exercise Science, College of Medicine, University of Florida, Gainesville 32610.
Med Sci Sports Exerc. 1993 Jan;25(1):132-8. doi: 10.1249/00005768-199301000-00018.
The purpose of this study was to evaluate the validity of a dynamic seven to 10 repetition maximum (7-10 RM) test to estimate maximal knee extension strength (1-RM) in untrained and trained subjects. Thirty-three men and 25 women (25 +/- 5 yr) were randomly assigned to a group that trained two or three times.wk-1 for 18 wk (N = 47) or a control group (N = 11). Training included one set of 7-10 repetitions to volitional fatigue on a Nautilus knee extension machine. Prior to (T1) and after training (T2) dynamic strength was evaluated by 1-RM and 7-10 RM tests. The 7-10 RM test consisted of one set of variable resistance knee extension exercise performed to volitional fatigue with a weight that allowed 7-10 repetitions. The training group improved their 1-RM and 7-10 RM strength (by 31.7 and 51.4%, respectively) (P < or = 0.01) while the control group did not change. Training increased relative 7-10 RM strength (68.4% of 1-RM at T1 and 79.1% of 1-RM at T2) (P < or = 0.01). The relationship between the 7-10 RM weight and 1-RM at T1 was linear: 1-RM = 1.554 (7-10 RM weight)-5.181; R2 = 0.89; SEE = 9.3 kg. Application of this equation following training resulted in a systematic overprediction (p < or = 0.01) of 1-RM (21.2 kg) in trained subjects.(ABSTRACT TRUNCATED AT 250 WORDS)
本研究的目的是评估动态7至10次重复最大值（7-10 RM）测试在未经训练和受过训练的受试者中估计最大膝关节伸展力量（1-RM）的有效性。33名男性和25名女性（25±5岁）被随机分配到一组，该组每周训练两到三次，持续18周（N = 47），或对照组（N = 11）。训练包括在诺德士膝关节伸展机上进行一组7-10次重复至意志疲劳。在训练前（T1）和训练后（T2），通过1-RM和7-10 RM测试评估动态力量。7-10 RM测试包括一组可变阻力膝关节伸展运动，以意志疲劳为目标，使用能完成7-10次重复的重量。训练组的1-RM和7-10 RM力量有所提高（分别提高了31.7%和51.4%）（P≤0.01），而对照组没有变化。训练增加了相对7-10 RM力量（T1时为1-RM的68.4%，T2时为1-RM的79.1%）（P≤0.01）。T1时7-10 RM重量与1-RM之间的关系呈线性：1-RM = 1.554（7-10 RM重量）-5.181；R2 = 0.89；标准误 = 9.3 kg。在训练后应用此方程会导致对受过训练的受试者的1-RM（21.2 kg）进行系统性高估（P≤0.01）。（摘要截断于250字）
