A NEW METHOD FOR MEASURING POWER OUTPUT IN A SINGLE LEG EXTENSION - FEASIBILITY, RELIABILITY AND VALIDITY
A NEW METHOD FOR MEASURING POWER OUTPUT IN A SINGLE LEG EXTENSION - FEASIBILITY, RELIABILITY AND VALIDITY
复制标题
DOI：
10.1007/bf00713504
复制
发表时间：
1990-06-01
影响因子：
3
通讯作者：
SHORT, AH
中科院分区：
文献类型：
--
作者：
BASSEY, EJ;SHORT, AH
描述了一种用于测量腿部伸展时的爆发力的方法，该方法已被发现对所有年龄组和身体能力水平都是安全和可接受的。伸展运动需要0.25-0.40秒，在推动通过0.165米对一个单位踏板。在推腿结束时，腿完全伸展。这个动作是坐着做的，这样力就被限制在臀部和脚之间。座椅位置根据腿的长度进行调整，推动力通过杠杆和链条传递，使飞轮旋转。传动装置使得运动阻力在整个延伸过程中几乎保持恒定。飞轮的最终角速度由光电开关测量，并用于计算推中的平均腿部伸肌功率（LEP）。功率测量的可靠性进行了评估，在46名受试者的年龄范围从20至86岁，他们包括医学生和老年日间病人。他们在相隔一周的两个场合进行了测试。第一次（至少五次试验中最好的一次）的最大值范围为30至300 W（平均值± 0.05）。1标准差= 154 ±。88 W）。复测无显著性差异，变异系数为9.4%。在一个由9名非初治受试者组成的亚组中，由经验丰富的观察者测量，该比例为6.3%。正如预期的那样，女性的权力低于男性，并随着年龄的增长而急剧下降。当这些值表示为单位体重的功率时，性别差异较小;仍然存在与年龄相关的急剧下降。从LEP钻机的结果进行了比较，在相同的情况下，从类似的推动对等速测力计和两条腿跳的力量板上相同的主题获得的结果。在两种情况下，存在高度显著的相关性，Spearman等级相关（rho）= 0.73，P < 0.001，n = 16个受试者（年龄27 ± 10岁）。7.5 13例受试者（年龄39 ± 10岁），rho = 0.86，P < 0.001。10.4年）。
A method is described for measuring the explosive power of the leg in extension which has been found safe and acceptable for all age groups and levels of physical capability. The extension movement takes 0.25-0.40 s in a push through 0.165 m against a flat pedal. At the end of the push the leg is fully extended. The movement is made seated so that the forces are contained between the buttocks and the foot. The seat position is adjusted for leg length and the push is transmitted by a lever and chain to spin a flywheel. The gearing is such that resistance to the movement remains nearly constant throughout the extension. The final angular velocity of the flywheel is measured by an optoswitch and used to calculated the average leg extensor power (LEP) in the push. The reliability of the power measurement was evaluated in 46 subjects ranging in age from 20 to 86 years; they included medical students and geriatric day patients. They were tested on two occasions separated by a week. The maximal values on the first occasion (best of at least five trials) ranged from 30 to 300 W (mean .+-. 1 SD = 154 .+-. 88 W). There was no significant difference on re-test and the coefficient of variation was 9.4%. In a subgroup of 9 non-naive subjects who were measured by an experienced observer it was 6.3%. As expected, power was lower in women than in men and declined sharply with age. The sex difference was less when the values were expressed as power per body mass; a sharp age-related decline remained. The results from the LEP rig were compared with results obtained in the same subjects on the same occasion from similar pushes against an isokinetic dynamometer and two-legged jumps on a force plate. There was a highly significantly correlation in both cases, Spearman''s rank correlation (rho) = 0.73, P < 0.001, n = 16 subjects (age 27 .+-. 7.5 years) and rho = 0.86, P < 0.001, n = 13 subjects (age 39 .+-. 10.4 years) respectively.