Avaliação da fadiga muscular em pacientes com doença renal crônica em tratamento hemodialítico por meio da curva força – tempo

Abstract

The purpose of this study was to evaluate muscle strength in patients with CKD undergoing hemodialysis through the power curve - time. We evaluated 12 patients with CKD and 10 healthy individuals, all settled with a mean age of 48 and 45 years were 4 respectivamente.Todos maximal voluntary contractions (MVC) and a CVM to exhaustion. During the protocol were coletatos the force curve and EMG simultaneously. The data were evaluated in MATLAB by a specific algorithm that measured maximum force (Fmax), loss of 10% power (F90%) loss of 20% power (F80%), loss of strength time (T90% and T80%), area under the curve between 100 - 90% and between 90-80% and the RMS of the EMG signal in the same period. No statistically significant differences were found in the variables studied. In F90 the average was 22.5% while that of controls kgf kgf 24.05. F80% in the DRC had a mean of 20.08 kgf while controls showed 21.38 kgf. The test showed that the CKD group shows a reduction of approximately 7% of muscle strength at the beginning of the test that lasts for the duration of the test. At the time of the average loss of strength of the CKD group was 3.5 seconds (100-90%) and 4.2 seconds (90-80%) in the control group and 3.2 seconds (100-90% ) and 4.2 seconds (90-80%). In the middle area of the curve was 0.021 (A100-90%) and 0.018 (A90-80%) in the DRC while the average of the control was 0.028 (A100-90%) and 0.023 (A90-80%). According to the results found the research group may not have an anticipatory fatigue, probably due to sample characteristics, because they are individuals not yet affected strongly by the myopathic disease.