Effects of percutaneous midband pulse current stimulation in hepatic region on the activity of hepatic mitochondrial Na+-K+-ATPase and Ca2+-Mg2+-ATPase in exercise-induced fatigued rats

Objective　To explore the effects of percutaneous impulsive current stimulation in hepatic region on the activity of hepatic mitochondrial Na+-K+-ATPase and Ca2+-Mg2+-ATPase in exercise-induced fatigued rats, in order to investigate the effect of exercise-induced fatigue. Methods　Seventy-two 8-week old male Wistar rats were randomly divided into 4 groups (18 each): control group (group A), fatigue group (group B), stimulation before fatigue group (group C) and stimulation after fatigue group (group D). Exhaustion of animals in B, C and D groups were reproduced by prolonged swimming. Current stimulation (1024Hz, 10mA, current cycle 1sec) for 20 minutes was given to the rats of group C before swimming, and to those in group D after exhaustion. At the weekend of 1st, 3rd and 5th week after modeling, the rats were sacrificed in batches from each group (6 each). The activities of hepatic mitochondrial Na+-K+-ATPase and Ca2+-Mg2+-ATPase were determined by spectrophotometry, and Bradfood protein quantification was employed to quantitate the protein in rats' hepatic mitochondria. Results　No significant difference was found in swimming-exhaustion time among 3 groups at the first weekend (P>0.05), while the swimming-exhaustion time was significantly prolonged at the 3rd and 5th weekends in group D than in group B and C (P 0.05), while the enzyme activities were obviously lower at the 3rd and 5th weekend in group B than that in groups A, C and D (P<0.05), and they were also lower in group C than that in group D (P<0.05). Conclusions　Exercise-induced fatigue can lower the activity of hepatic mitochondrial Na+-K+-ATPase and Ca2+-Mg2+-ATPase. Percutaneous pulsive current stimulating hepatic region of exercise-induced fatigued rats may improve the enzyme activity, reduce the concentration of free calcium and calcium overload in mitochondria, stimulate the oxidative phosphorylation, accelerate the rate of respiratory chain, promote exercise endurance and score, and relieve exercise-induced fatigue rapidly. DOI: 10.11855/j.issn.0577-7402.2015.04.15