Murakami Kenichi, Fujisawa Hiroyuki, Onobe Jun, Sato Yoichiro
Tohoku Bunka Gakuen University, Japan.
Graduate School of Health and Environment Sciences, Tohoku Bunka Gakuen University, Japan.
J Phys Ther Sci. 2014 Apr;26(4):621-4. doi: 10.1589/jpts.26.621. Epub 2014 Apr 23.
[Purpose] The aim of this study was to clarify the relationship between the muscle fiber conduction velocity (MFCV) obtained during muscle twitches from evoked potentials and the dynamic characteristics of muscular tension (muscle dynamic characteristics) by manipulating deep temperature. [Subjects] Subjects were 10 healthy adult men. Their mean age was 23.0 ± 3.9 years. [Methods] Measurement items were MFCV of the right tibialis anterior muscle and the force-time curve of right ankle dorsiflexion (muscle twitch). Measurements were made under conditions of ordinary (room) temperature, hot and cold. The rate of change in maximum torque was calculated from the force-time curve. [Results] In all subjects, MFCV increased significantly with heating and decreased significantly with cooling. A strong correlation was seen between MFCV and deep temperature. A strong correlation was also seen between MFCV and the rate of change in maximum torque. Stronger correlations were seen in the present results than in previous studies that conducted investigations using voluntary contractions. [Conclusion] The present results were not affected by psychological or other such factors, and are valuable as data with high physiological reliability. In conclusion, this study was able to clarify the relationship between MFCV from evoked potentials and muscle dynamic characteristics.
[目的]本研究旨在通过控制深部体温，阐明诱发电位肌肉抽搐期间获得的肌纤维传导速度（MFCV）与肌肉张力动态特性（肌肉动态特性）之间的关系。[对象]研究对象为10名健康成年男性。他们的平均年龄为23.0±3.9岁。[方法]测量项目为右胫前肌的MFCV和右踝关节背屈的力-时曲线（肌肉抽搐）。在常温（室温）、热和冷的条件下进行测量。根据力-时曲线计算最大扭矩的变化率。[结果]在所有受试者中，MFCV随加热显著增加，随冷却显著降低。MFCV与深部体温之间存在强相关性。MFCV与最大扭矩变化率之间也存在强相关性。与以往使用自主收缩进行研究的结果相比，本研究结果的相关性更强。[结论]本研究结果不受心理或其他此类因素的影响，作为具有高生理可靠性的数据具有重要价值。总之本研究能够阐明诱发电位的MFCV与肌肉动态特性之间的关系。
