Measurements of Isometric Strength and Electromyography of Elbow Flexors under Active and Passive Conditions
Measurements of Isometric Strength and Electromyography of Elbow Flexors under Active and Passive Conditions
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DOI：
10.14326/abe.8.124
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发表时间：
2019-01-01
影响因子：
1
通讯作者：
Toji, Hideki
中科院分区：
文献类型：
--
作者：
Higa, Masaru;Araki, Nozomu;Toji, Hideki
本研究的目的是测量两种不同条件下的最大等长力量：主动和被动条件。同时测量肌电图（EMG）。对健康人手肘屈肌群进行了研究。6名健康受试者参加了本研究。在两种不同的情况下，测量手肘屈肌的等长最大力和肌电。第一个是标准等长测量，其中受试者使用其肘屈肌以100%的努力（主动）主动拉动固定线。在第二种情况下，受试者试图尽可能长时间地保持肘部屈曲90度，以抵抗电动机（被动）产生的外力。在等长阶段，当手肘角度保持不变时，提取最高的力值。因此，在随后的测量中，还通过电子测角器监测手肘角度。在6名受试者中，有4名受试者的被动条件比主动条件导致更高的力。对于在两种条件下表现出不同最大力的受试者，主动和被动条件下测得的最大力的平均值（标准差）分别为285.2（11.0）N和300.2（14.1）N（p < 0.01）。对于EMG，两种情况之间没有显著差异。总之，与标准等长条件下获得的力相比，本研究中使用的被动条件增强了等长最大力。
The aim of this study was to measure maximum isometric force under two different conditions: active and passive conditions. The electromyograms (EMGs) were also measured. The elbow flexors of healthy subjects were studied. Six healthy subjects took part in this study. The isometric maximum force and the EMGs of the elbow flexors were measured under two contrasting conditions. The first was a standard isometric measurement in which a subject actively pulled a fixed wire using their elbow flexor at 100% effort (active). In the second case, the subject tried to keep their elbow at 90 degrees of flexion for as long as possible against external forces produced by an electric motor (passive). The highest force values were extracted during the isometric phase when the elbow angles were kept constant. Hence, the elbow angles were also monitored by an electric goniometer in the later measurement. The passive condition resulted in higher forces than the active condition in 4 of 6 subjects. For a subject who showed different maximum forces under the two conditions, the mean (standard deviation) measured maximum forces under active and passive conditions were 285.2 (11.0) N and 300.2 (14.1) N, respectively (p < 0.01). For the EMG, there were no significant differences between the two conditions. In conclusion, the passive condition used in this study enhanced isometric maximum forces compared to that obtained under standard isometric conditions.