Rhodes David, Alexander Jill
Rehabilitation Services, University of Central Lancashire, Preston, England.
Int J Sports Phys Ther. 2018 Dec;13(6):985-992.
Cryotherapy is commonly used in sport for the management of injury or during recovery, however the effects on concentric isokinetic strength appear unclear when considering the effect of joint cooling distal to the anterior thigh.
The purpose of this study was to investigate the effect of cooling of the knee joint on quadriceps concentric isokinetic torque production. The results will inform the use of cryotherapy in practice.
Observational cohort, Repeated Measures.
Fourteen healthy male participants volunteered to take part in the study, all of whom regularly played competitive sports (mean age 20.24 ± 1.51years; body mass 80.34 ± 11.34Kg and height 179.45 ± 6.59cm). 800 g of crushed ice was applied over the anterior knee joint for 20 minutes. Concentric quadriceps strength was measured using an isokinetic dynamometer (IKD) by measuring concentric peak (PkT) and average torque (AvT) outputs at pre-, immediately post and 20 minutes post cooling intervention. Additionally, skin surface temperature (T ), was measured using a hand-held thermometer at the patella at the same time intervals. Measurement was taken at the mid-point of each participant's patella, which was ascertained by measuring between the base and apex.
Significant main effects reported for PkT, for time post-ice application ( = 0.02, ≤ =0.161). Post-hoc analysis revealed pre-ice application PkT to be significantly higher ( ≤ 0.003) than all other timepoints. Quadratic regression analysis revealed a strong correlation between reductions in quadriceps torque production and time post application (r=0.82). The quadratic pattern of recovery displays a minima of 17.28-minutes and maxima of 34.56-minutes post ice application. AvT post-ice application demonstrated significant main effects for time post-ice application (p=0.03, ≤ 2=0.152). Post-hoc analysis revealed pre-ice application AvT to be significantly higher ( ≤ 0.005) than at all other timepoints. Quadratic regression analysis revealed a strong correlation between reductions in quadriceps torque production and time post application (r=0.80). The quadratic pattern of recovery displays a minima of 18.38-minutes and maxima of 36.76-minutes post ice application. T reduced significantly, immediately post intervention ( ≤ 0.05) without returning to baseline measures at 20-minutes post ( ≤ 0.05).
Isokinetic peak torque values of the quadriceps diminish after cryotherapy application to the knee joint and are not fully recovered at 20 minutes post application on the knee. These findings could have potential implications for participation in activity immediately following ice application.
2b.
冷冻疗法在运动中常用于损伤处理或恢复过程，然而，考虑到大腿前部远端关节冷却的影响，其对向心等速力量的作用尚不清楚。
本研究旨在探讨膝关节冷却对股四头肌向心等速扭矩产生的影响。研究结果将为冷冻疗法在实际应用中的使用提供参考。
观察性队列研究，重复测量。
14名健康男性参与者自愿参加本研究，他们均经常参加竞技运动（平均年龄20.24±1.51岁；体重80.34±11.34千克，身高179.45±6.59厘米）。在膝关节前部放置800克碎冰20分钟。使用等速测力计（IKD）测量股四头肌向心力量，通过测量冷却干预前、干预后即刻和干预后20分钟的向心峰值（PkT）和平均扭矩（AvT）输出。此外，使用手持温度计在相同时间间隔测量髌骨处的皮肤表面温度（T）。测量在每个参与者髌骨的中点进行，该中点通过测量髌骨底部和顶点之间的距离确定。
报告了PkT在冰敷后时间上的显著主效应（=0.02，≤=0.161）。事后分析显示，冰敷前的PkT显著高于所有其他时间点（≤0.003）。二次回归分析显示，股四头肌扭矩产生的降低与冰敷后时间之间存在强相关性（r=0.82）。恢复的二次模式显示冰敷后17.28分钟为最小值，34.56分钟为最大值。冰敷后的AvT在冰敷后时间上显示出显著主效应（p=0.03，≤2=0.152）。事后分析显示，冰敷前的AvT显著高于所有其他时间点（≤0.005）。二次回归分析显示，股四头肌扭矩产生的降低与冰敷后时间之间存在强相关性（r=0.80）。恢复的二次模式显示冰敷后18.38分钟为最小值，36.76分钟为最大值。干预后即刻T显著降低（≤0.05），在干预后20分钟未恢复到基线水平（≤0.05）。
膝关节应用冷冻疗法后，股四头肌的等速峰值扭矩值降低，在膝关节应用后20分钟未完全恢复。这些发现可能对冰敷后立即参与活动有潜在影响。
2b。
