Time course of changes in passive properties of the gastrocnemius muscle-tendon unit during 5 min of static stretching
Time course of changes in passive properties of the gastrocnemius muscle-tendon unit during 5 min of static stretching
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DOI：
10.1016/j.math.2012.09.010
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发表时间：
2013-06-01
期刊：
影响因子：
--
通讯作者：
Ichihashi, Noriaki
中科院分区：
文献类型：
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作者：
Nakamura, Masatoshi;Ikezoe, Tome;Ichihashi, Noriaki
静态拉伸（SS）改变肌肉-肌腱单元（MTU）的被动特性所需的最短时间，以及这些被动特性之间的关联，目前尚不清楚。本研究调查的时间过程中的被动特性的变化腓肠肌MTU在5分钟的SS。受试者包括20名健康男性（22.0 +/- 1.8岁）。在5 min的SS过程中，使用超声和测力计评估被动扭矩作为MTU阻力的指标和肌腱接头（MTJ）位移作为肌肉伸展性的指标。使用Scheffe事后检验确定SS之前和期间每1分钟的显著差异。被动扭矩和MTJ位移之间的关系，为每个主题进行了测定，使用皮尔逊的积矩相关系数。虽然被动扭矩和MTJ位移的逐渐变化，表现出每分钟，这些变化变得有统计学意义后，2，3，4，和5分钟的SS相比，SS前的值。此外，5 min SS后的被动扭矩显著低于2 min SS后的被动扭矩。同样，5 min SS后的MTJ位移显著高于2 min SS后。被动扭矩与MTJ位移呈显著正相关（r = -0.886 ~-0.991），提示持续2 min以上的SS可有效地增加肌肉的伸展性，从而降低MTU阻力。(C)2012爱思唯尔有限公司保留所有权利。
The minimum time required for Static stretching (SS) to change the passive properties of the muscle-tendon unit (MTU), as well as the association between these passive properties, remains unclear. This study investigated the time course of changes in the passive properties of gastrocnemius MTU during 5 min of SS.The subjects comprised 20 healthy males (22.0 +/- 1.8 years). Passive torque as an index of MTU resistance and myotendinous junction (MTJ) displacement as an index of muscle extensibility were assessed using ultrasonography and dynamometer during 5 min of SS. Significant differences before and every 1 min during SS were determined using Scheffe's post hoc test. Relationships between passive torque and MTJ displacement for each subject were determined using Pearson's product-moment correlation coefficient.Although gradual changes in both passive torque and MTJ displacement were demonstrated over every minute, these changes became statistically significant after 2, 3, 4, and 5 min of SS compared with the values before SS. In addition, passive torque after 5 min SS was significantly lower than that after 2 min SS. Similarly, MTJ displacement after 5 min SS was significantly higher than that after 2 min SS. A strong correlation was observed between passive torque and MTJ displacement for each subject (r = -0.886 to -0.991).These results suggest that SS for more than 2 min effectively increases muscle extensibility, which in turn decreases MTU resistance. (C) 2012 Elsevier Ltd. All rights reserved.