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关于皮肤冷刺激中使用的快速纤维类型的选择性激活的训练方法的发展的数据，使用5个实验。在快速实验中，用冷皮肤刺激法研究了低温对小鼠从低到MVC力输出的阈值的影响，发现从20%MVC到大约60%MVC的小鼠被低温影响，而60%MVC以上的小鼠不受低温的影响。我们推测，运动单位阈值力量的变化可能是由于脊髓内皮肤传入冲动的某种作用而选择性地产生的。在第二个实验中，我们研究了对侧皮肤传入冲动的影响，我们发现，同侧的冷刺激选择性地被HT-MU的阈值力量所促进：而对侧的冷刺激则抑制…更像是泰德。我们推测，使用冷刺激进行训练是有效的，因为它只是降温的一部分。实验三用冷皮肤刺激法研究了不同速度慢坡道收缩时低温对小鼠招募阈值力量的影响，结果表明，当受试者进行快速坡道收缩时，皮肤温度的降低会影响小鼠的阈值力量。然而，当受试者进行中速和慢速收缩时，由于MUS的放电频率和皮肤传入的输入影响运动神经元，因此MUS的阈值力量不受皮肤温度的降低的影响。在第四个实验中，我们研究了低温对小鼠在偏心斜坡收缩(EC)中的阈值力量的影响，发现皮肤温度的降低对EC中的HT-MUS的阈值力量没有显着影响。我们推测，使用冷刺激最有效的收缩是向心性收缩。实验五，利用100m等级较高的受试者的数据，分析100m成绩与出生地、训练地点、训练着装的关系。发现100m成绩与受试者出生地温度显著相关，认为皮肤冷刺激训练方法对选择性激活快纤维类型是有效的。较少

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