Verdera F, Champavier L, Schmidt C, Bermon S, Marconnet P
Laboratoire de Recherche sur les Activités Physiques et Sportives UFR STAPS, Université de Nice Sophia-Antipolis, France.
J Sports Med Phys Fitness. 1999 Jun;39(2):113-9.
The purpose of this study was to assess the validity of a new device to evaluate isometric strength during multi-joint exercise such as the squat or bench press.
The device used an electric motor-driven bar to simultaneously generate and measure forces during weight lifting exercises. This new device and a force platform measured the forces generated by either the motor on a fixed telescopic steel girder (passive condition) or a subject pushing vertically against the bar from three squat positions (active condition). In the passive condition, 252 measurements were made, with 3 trials for 6 bar heights and 14 bar loads. In the active condition, 8 young physically active students (age, height and body mass were 25.1 +/- 2.6 years, 179.3 +/- 7.2 cm and 82.0 +/- 9.9 kg, respectively) performed 3 maximal isometric strength (MIS) trials in each of the 3 squat exercise positions (parallel, half and quarter squat), and 3 additional MIS trials in one position randomly assigned two weeks later to test inter-day reliability.
In the passive condition, no differences were observed between the forces measured by the force platform and the new device. The coefficient of linear regression (r) and the coefficient of variation (CV) were 1 and below 0.23%, respectively. In the active condition, the peak MIS measured was 2828 N and the values of r and CV were above 0.982 and below 5.96%, respectively. The assessment of inter-day reliability showed an r value of 0.984 and a CV of 3.98%.
This study demonstrated that the new electric motor-driven exerciser provides valid and reliable data when used to generate forces and measure isometric strength throughout the load and motion ranges commonly used in squat exercise.
本研究旨在评估一种新型设备在深蹲或卧推等多关节运动中评估等长力量的有效性。
该设备使用电动杆在举重练习过程中同时产生和测量力量。这种新型设备和一个力平台测量了在固定伸缩钢梁上由电机产生的力量（被动状态），或者在三个深蹲位置受试者垂直推压杆产生的力量（主动状态）。在被动状态下，进行了252次测量，针对6个杆高度和14个杆负荷各进行3次试验。在主动状态下，8名年轻的体育活跃学生（年龄、身高和体重分别为25.1±2.6岁、179.3±7.2厘米和82.0±9.9千克）在3个深蹲练习位置（平行深蹲、半程深蹲和四分之一深蹲）各进行3次最大等长力量（MIS）试验，并在两周后随机分配的一个位置再进行3次MIS试验以测试日间可靠性。
在被动状态下，力平台和新型设备测量的力量之间未观察到差异。线性回归系数（r）和变异系数（CV）分别为1和低于0.23%。在主动状态下，测量的最大等长力量峰值为2828牛，r值和CV值分别高于0.982和低于5.96%。日间可靠性评估显示r值为0.984，CV为3.98%。
本研究表明，这种新型电动锻炼器在用于在深蹲练习常用的负荷和运动范围内产生力量并测量等长力量时，能提供有效且可靠的数据。
