Development of training methods for selective activation of the fast fiber type using skin cold stimulation

本研究的目的是收集数据的发展，选择性激活的快速纤维类型的训练方法用于皮肤冷刺激，使用5个实验。在快速实验中，我们采用冷皮肤刺激法研究了低温对从低到MVC力输出的MU阈值力的影响，发现从20%MVC到大约60%MVC的MU受低温的影响，而60%MVC以上的MU不受低温的影响。我们推测，这种运动单位阈力的变化可能是由皮肤传入冲动在脊髓内的某种作用选择性地产生的。在第二个实验中，我们研究了对侧皮肤传入冲动的作用，发现HT-MU的阈值力选择性地易化同侧的冷刺激，而对侧的冷刺激则被抑制。 关于我们 Ted.我们推测，使用冷刺激的训练是有效的，只是冷却的目的的一部分。第三个实验用冷皮肤刺激法研究了低温对不同速率的慢斜坡收缩时MU募集阈值力的影响，结果表明，当受试者进行快斜坡收缩时，随着皮肤温度的降低，MU募集阈值力受到影响。然而，当受试者执行的中，慢斜坡收缩率，阈值力的MU不受皮肤温度降低，因为放电频率的MU和皮肤传入的输入影响运动神经元。在第四个实验中，我们研究了低温对离心斜坡收缩（EC）过程中MU阈值力的影响，发现随着皮肤温度的降低，EC过程中HT-MU的阈值力没有受到显着影响。我们推测，冷刺激引起的最有效的收缩是向心性收缩。实验五以100 m高级别运动员为研究对象，分析了100 m成绩、出生地、训练地与训练服的关系。发现100米跑成绩与出生地温度有显著相关，认为采用皮肤冷刺激的训练方法对选择性激活快纤维型是有效的。少

The aim of this study was to collect data on the development of training methods for selective activation of the fast fiber type using in skin cold stimulation, using 5 experiments. In the fast experiment the effects of low temperature on the threshold force of MUs from lower to MVC force output using the cold skin stimulation method were investigated and we found that the recruited MUs from 20%MVC to approximately 6O%MVC were affected by low temperature, but the recruited MUs above 60%MVC were not affected by low temperature. We speculated that the changes of threshold force of motor units might be selectively produced by some effect of cutaneous afferent impulses in the spinal cord. In the second experiment the effects of cutaneous afferent impulses from the contralateral side were investigated and we found that the cold stimulation in the ipsilateral side was selectively facilitated by the threshold force of the HT-MUs : however, cold stimulation in the contralateral side was inhibi … More ted. We speculated suggested that training using cold stimulation was effective to be cooling only the part of purpose. In the third experiment the effects of low temperature on the recruitment threshold force of MUs during different rates of slow ramp contractions using the cold skin stimulation method were investigated and the results suggested that when the subjects performed the rates of the fast ramp contractions, the threshold force of MUs were affected with decreased skin temperature. However, when the subjects performed the rates of the medium and slow ramp contractions, the threshold force of MUs were not affected with decreased skin temperature, because the firing rate of MUs and the input of cutaneous afferent affected the motomeuron. In the fourth experiment the effects of low temperature on the threshold force of MUs during the eccentric ramp contraction (EC) were investigated and we found the threshold force of the HT-MUs during the EC was not significantly affected with decreased skin temperature. We supeculated that the most effective contraction using cold stimulation was the concentric contraction. In the fifth experiment subject's data who have a high rank of 100m were used to analyze the relationship between record of 100m, birthplace, training place and training wear. We found that record of 100m and the temperature of the subject's birthplace were significantly related.We considered that the training method using skin cold stimulation was effective to selectively activate the fast fiber type. Less