Algafly Amin A, George Keith P
Manchester Metropolitan University.
Br J Sports Med. 2007 Jun;41(6):365-9; discussion 369. doi: 10.1136/bjsm.2006.031237. Epub 2007 Jan 15.
To determine the impact of the application of cryotherapy on nerve conduction velocity (NCV), pain threshold (PTH) and pain tolerance (PTO).
A within-subject experimental design; treatment ankle (cryotherapy) and control ankle (no cryotherapy).
Hospital-based physiotherapy laboratory.
A convenience sample of adult male sports players (n = 23).
NCV of the tibial nerve via electromyogram as well as PTH and PTO via pressure algometer. All outcome measures were assessed at two sites served by the tibial nerve: one receiving cryotherapy and one not receiving cryotherapy.
In the control ankle, NCV, PTH and PTO did not alter when reassessed. In the ankle receiving cryotherapy, NCV was significantly and progressively reduced as ankle skin temperature was reduced to 10 degrees C by a cumulative total of 32.8% (p<0.05). Cryotherapy led to an increased PTH and PTO at both assessment sites (p<0.05). The changes in PTH (89% and 71%) and PTO (76% and 56%) were not different between the iced and non-iced sites.
The data suggest that cryotherapy can increase PTH and PTO at the ankle and this was associated with a significant decrease in NCV. Reduced NCV at the ankle may be a mechanism by which cryotherapy achieves its clinical goals.
确定冷冻疗法对神经传导速度（NCV）、痛阈（PTH）和耐痛阈（PTO）的影响。
受试者自身实验设计；治疗侧踝关节（冷冻疗法）和对照侧踝关节（无冷冻疗法）。
医院理疗实验室。
成年男性运动员的便利样本（n = 23）。
通过肌电图测量胫神经的NCV，以及通过压力痛觉计测量PTH和PTO。所有观察指标在胫神经支配的两个部位进行评估：一个接受冷冻疗法，另一个不接受冷冻疗法。
在对照侧踝关节，再次评估时NCV、PTH和PTO未发生改变。在接受冷冻疗法的踝关节，随着踝关节皮肤温度累计降低至10摄氏度，NCV显著且逐渐降低，总计降低32.8%（p<0.05）。冷冻疗法使两个评估部位的PTH和PTO均升高（p<0.05）。冷冻部位和非冷冻部位之间PTH（89%和71%）和PTO（76%和56%）的变化无差异。
数据表明冷冻疗法可提高踝关节的PTH和PTO，这与NCV显著降低有关。踝关节NCV降低可能是冷冻疗法实现其临床目标的一种机制。
