Lander J E, Bates B T, Sawhill J A, Hamill J
Med Sci Sports Exerc. 1985 Jun;17(3):344-53.
The purpose of the study was to evaluate selected parameters describing performance characteristics of a free-weight and isokinetic bench press. A secondary purpose was an attempt to clarify the technique requirements essential for a successful lift. Parameters describing the free-weight condition were generated from cinematographic data (150 fps) for five trials each at 90 and 75% of the subject's maximal performance (1RM). Isokinetic data were obtained from an instrumented Cybex Power Bench Press at two speeds corresponding to the average speeds for the free-weight conditions. Despite differences, accommodation appeared to occur for both methods when the lifts were performed maximally. A "sticking region" was defined as the portion of the free-weight activity when the subjects' force application was less than the weight of the bar. No significant difference (P less than 0.05) was observed between the 90% 1RM (26.02%) and 75% 1RM (26.94%) mean relative time values for these regions. For the Cybex device, the percentage of the activity which was isokinetic was longer for the slower speeds of rotation (0.47 rad X s-1 = 70%) and steadily decreased until the movement was only 50% isokinetic at 1.74 rad X s-1. The observed relationships between applied force-time data along with anatomical considerations suggest an ideal technique for the lift.
本研究的目的是评估描述自由重量卧推和等速卧推性能特征的选定参数。第二个目的是试图阐明成功完成推举所需的技术要求。描述自由重量条件的参数来自电影数据（150帧/秒），在受试者最大力量（1RM）的90%和75%水平下各进行5次试验。等速数据是从配备仪器的赛百斯力量卧推机上以与自由重量条件下平均速度相对应的两种速度获得的。尽管存在差异，但当最大程度地进行推举时，两种方法似乎都出现了适应性变化。“停滞区域”被定义为自由重量运动中受试者施加的力小于杠铃重量的部分。在这些区域，90% 1RM（26.02%）和75% 1RM（26.94%）的平均相对时间值之间未观察到显著差异（P<0.05）。对于赛百斯设备，旋转速度较慢时（0.47弧度×秒-1 = 70%）等速运动的活动百分比更长，并且随着速度增加稳步下降，直到在1.74弧度×秒-1时运动仅50%为等速运动。观察到的施加力-时间数据之间的关系以及解剖学因素提示了一种理想的推举技术。
