Estimulação diafragmática elétrica transcutânea melhora as condições metabólicas dos músculos respiratórios de ratos

Abstract

Transcutaneous Electrical Stimulation of the Diaphragm Improves the Metabolic Conditions of Respiratory Muscles in Rats Objective: To evaluate the respiratory muscle glycogen content and electrocardiogram (ECG) records of rats subjected to transcutaneous electric stimulation of the diaphragm (TESD). Method: Two groups (n=6) of male adult Wistar rats were utilized over a five-day period: controls (C) and TESD treatment (f = 50Hz; T ON / T OFF = 2/2 sec.; T = 400μs, i = 5mA with 1mA increase every three min.; t = 20 minutes). After this period, ECG analysis was done, followed by sacrificing the animals to obtain samples of the pectoral, intercostal, diaphragm and abdominal (A) muscles, which were used for glycogen content analysis. Statistical analysis was performed using the normality and Student t tests (p 0.05); 81.2% in the intercostal muscle (C: 0.32 ± 0.08 vs. TESD: 0.58 ± 0.17, p>0.05); 96.7% in the pectoral muscle (C: 0.30 ± 0.05 vs. TESD: 0.59 ± 0.06, p<0.05); and 104.5% in the abdominal muscles (C: 0.22 ± 0.01 vs. TESD: 0.45 ± 0.03, p<0.05). The ECG analysis showed that there were no alterations in the parameters analyzed (heart rate and QR, QT and QTc intervals) in the TESD group. Conclusion: This study suggests a protocol for TESD using an animal model. The results showed the efficacy of the protocol for improving the energy conditions in the respiratory musculature without interfering in cardiac electric dynamics.