| Summary: | 碩士 === 國立臺灣大學 === 物理治療學研究所 === 101 === Quadriceps strength deficit is a mojor problem in knee injuries or post-surgery. Arthrogenic muscle inhibition (AMI) is thought the reason of quadriceps weakness. Previous studies suggest cryotherapy can inhibit AMI to increase motor neuron excitability. Quadriceps peak torque in maximal voluntary isometric contraction usually takes a longer time to reach maximum force than daily activity like go up/down stairs.peak torque maybe not a good criteria to evaluate someone’s knee function. To date, there is no study using initial phase rate of EMG raise (RER), rate of force development (RFD) and quadriceps normalized EMG to evaluate fast and forceful quadriceps contraction in subjects with knee surgery.Our purpose is to evaluate the therapeutic effects of cryotherapy on AMI in subjects with cruciate ligament injury.
Method: Our study includes 8 subjects with cruciate ligament reconstruction and 9 health controls. Isometric and isokinetic test at pre-surgery, post-surgery 3 months and post-surgery 6 months. EMG was recorded at the same time. MVIC, initial phase rate of force development, endurance, peak RMS EMG, RER, hamstrings antagonist coactivation, quadriceps normalized EMG, pain scale, single hop for distance and knee functional scale were measured. Statistic: Mann-Whitney U test, Wilcoxon signed rank test and Friedman test were performed to analysis the difference between subjects and controls, the difference between involved and un-involved and the difference among pre-surgery, post-surgery 3 months and post-surgery 6 months. Spearman''s Rank Order correlation was performed to evaluate the correlation between knee function and neuromuscular parameters.
Outcome: Subjects were lower than controls in RFD, RER, single hop.Hsmastings antagnosit coactivation in subjects was higher than in controls.High correlation was noted between biceps RER and knee function.
Conclusion：Cryotherapy and rehabilitation programs can improve muscle performance. RFD and RER in subjects were lower than controls.Cryotherapy and low resistance explosive training programs should be inclused in future training programs. Beside, we should pay more attention on hamstrings RER due to the high correlation between hamstrings RER and knee functions.
Keyword : cryotherapy、physical therapy、rate of force development、rate of EMG raise、arthrogenic muscle inhibition
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