A DYNAMOMETER FOR EVALUATION OF DYNAMIC MUSCLE WORK
A DYNAMOMETER FOR EVALUATION OF DYNAMIC MUSCLE WORK
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DOI：
10.1007/bf00618487
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发表时间：
1995-05-01
期刊：
影响因子：
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通讯作者：
TRANQUILLI, C
中科院分区：
文献类型：
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作者：
BOSCO, C;BELLI, A;TRANQUILLI, C
介绍了一种用于评价肌肉动力性作功的新型测力仪的有效性。该装置基于使用重力载荷作为外部阻力的任何机器的载荷位移的精确测量。它允许通过由红外线光电断路器组成的传感器来计算同心、偏心和拉伸缩短周期活动中的速度、力和功率。为了验证测功器的有效性，33名男女田径运动员(12名投掷运动员和21名跳跃运动员)参加了这项研究。这些运动员(4名女性和8名男性)被要求在滑块机上进行半蹲练习，负荷为受试者体重的100%。半蹲训练的日常可重复性与平均推力(AF)、平均推力(AV)和平均推力(AP)的相关系数分别为0.88、0.97和0.95。跳跃运动员(7名女性和14名男性)进行了半蹲测量与跳跃和跑步测试评估的比较。不同变量之间的相互关系显示，AF、AV和AP与短跑和跳跃参数有很强的相关性(r=0.53-0.97；P<；0.05-0.001)。利用在不同负荷(范围为受试者身体质量的35%至210%)进行的半蹲训练中产生的AF、AV和AP值，也可以建立男性和女性跳跃运动员的力量-速度和功率-速度关系。在任何单个情况下，对于AF、AV和AP，由测量系统引起的最大误差分别小于0.3%、0.9%和1.2%。考虑到测功器的准确性、两天测量之间的高可靠性和结果的特异性，动态测功器适合于评估运动员的特定技能。此外，由于涉及适当肌肉群的单个和多个关节运动可以很容易地进行，因此可以为运动和康复目的评估生理特征。因此，该测功机使用简单，成本低，适用于实验室和现场条件。
The validation of a new dynamometer for evaluation of dynamic muscle work is presented. The device was based on a precise measurement of load displacements of any machine using gravitational loads as external resistance. It allowed, through a sensor consisting of an infrared photo interrupter, the calculation of velocity, force and power during concentric, eccentric and stretch-shortening cycle activity. To validate the dynamometer 33 male and female track and field athletes (12 throwers and 21 jumpers) participated in the study. The throwers (4 women and 8 men) were asked to perform half-squat exercises on a slide machine with a load of 100% of the subject's body mass. The day-to-day reproducibility of half-squat exercises gave a correlation coefficient of r = 0.88, 0.97 and 0.95 for average push-off force (AF), average push-off velocity (AV), and average push-off power (AP) respectively. Comparison of half-squat measurements was performed against jumping and running test evaluation by the jumpers (7 women and 14 men). The interrelationships among the different variables studied demonstrated a strong correlation between AF, AV and AP and sprinting and jumping parameters (r = 0.53-0.97; P < 0.05-0.001). Using values of AF, AV and AP developed in half-squat exercises executed with different loads, ranging from 35% to 210% of the subject's body mass, it was also possible to establish the force-velocity and power-velocity relationships for both male and female jumpers. In any individual case, the maximal error due to the measurement system was calculated to be less than 0.3%, 0.9% and 1.2% for AF, AV, and AP respectively. Given the accuracy of the ergometer, the high reliability found between 2 days of measurements, and the specificity of the results it is suggested that the dynamic dynamometer would be suitable for evaluation of athletes performing specific skills. In addition, because single and multiple joint movements involving appropriate muscle groups call be easily performed, physiological characteristics could be evaluated for both athletic and rehabilitation purposes. Therefore, because of its simplicity of use and application, and its low cost the dynamometer would be suitable for both laboratory and field conditions.