目的 探讨不同间动周期中频脉冲电流经皮刺激肝区对运动性疲劳士兵体能恢复的影响.方法 选择120名无训练史的健康男性新兵,随机均分为对照组及刺激A组、刺激B组、刺激C组,每组30名.4组均进行为期5周的强化训练(每周一至周六训练6d,周日休息1d)以建立运动性疲劳模型,刺激A、B、C组于每天训练结束后给予经皮肝区中频脉冲电流(频率1024Hz,电流强度≤80mA)康复治疗,间动周期分别为0.5、1.0、2.0s,对照组不进行脉冲电流刺激.4组均于第1、3、5周的周日在清晨空腹状态下采集静脉血,测定空腹血糖(FPG)、血乳酸(LAC)含量及丙氨酸转氨酶(ALT)、天冬氨酸转氨酶(AST)、乳酸脱氢酶(LDH)活性,并于同日测试各组士兵3000m跑步成绩.结果 第1周末4组FPG含量无显著差异(P＞0.05),第3、5周末3个刺激组FPG含量均显著高于对照组(P＜0.01),且刺激B组显著高于刺激A、C组(P＜0.01),刺激A、C组之间比较无显著差异(P＞0.05).第1、3、5周末各刺激组血清ALT、AST、LDH活性及LAC含量均显著低于对照组(P＜0.05,P＜0.01),且刺激B组显著低于刺激A、C组(p＜0.05,P＜0.01),而刺激A、C组之间比较无显著差异(P＞0.05).第1周末4组3000m跑成绩无显著差异(P＞0.05),第3、5周末各刺激组3000m跑用时均短于对照组(-P＜0.01),且刺激B组短于刺激A、C组(P＜0.05,P＜0.01),而刺激A、C组之间比较无显著差异(P＞0.05).结论 不同间动周期中频脉冲电流可明显减轻运动性疲劳所致的肝损伤,促进体内能量生成,加速乳酸清除,提高运动耐力,具有缓解运动性疲劳的作用,其中以频率1024Hz、间动周期1.0s的中频脉冲电流效果最佳.%Objective To investigate the anti-fatigue effect of percutaneous stimulation with the middle-frequency pulse current in different diadynamic cycles in the hepatic region in exercise-induced fatigued soldiers. Metbods One hundred twenty healthy PLA recruits who did not have physical exercise were randomly divided into four groups with thirty recruits in each: control, stimulation group A, stimulation group B, and stimulation group C. All the subjects of four groups were given training with great intensity (exercise from Monday to Saturday, with rest on Sunday) for five weeks to establish the exercise-induced fatigue model. Each day after the exercise, the recruits of stimulation groups A, B, and C were treated immediately with middle-frequency (1,204hz, current intensity ≤80mA) stimulation to the hepatic region with diadynamic cycles of 0.S, 1, and 2 seconds, respectively. No pulse current stimulation was given in the control group. Venous blood was collected before breakfast on Sundays to measure the fasting plasma glucose (FPG) and blood lactate (LAC) contents, and liver function was determined by determination of alanine aminotransferase (ALT), aspartate aminotransferase (AST), and lactate dehydrogenase (LDH). The scores of 3,000m race of the recruits in each group were recorded on same day. Results There was no significant difference among the four groups in terms of the FPG level at the end of the first week (P>0.0S). At the end of the third and fifth weeks, the FPG level was significantly higher in the three stimulation groups than that of the control group (P.<0.0l). It was significantly higher in stimulation group B than in stimulation groups A and C, respectively (P<0.0l), but there was no significant difference between stimulation groups A and C (P>0.05). At the end of the first, third, and fifth weeks, the ALT, AST, LDH, and LAC levels were significantly lower in every stimulation group compared with those in the control group (P<0.05, P<0.01). They were significantly lower in stimulation group B than in stimulation groups A and C, respectively (P<0.05, P<0.0l), but there was no significant difference between stimulation groups A and C (P>0.05). At the end of the first week, there was no significant difference in scores of 3,000m racing (P>0.05) among 4 groups. At the end of the third and fifth weeks, the 3,000m racing score was significantly better in every stimulation group as compared with that of the control group (P<0.0l). The score was significantly better in stimulation group B than in stimulation groups A and C, respectively (P<0.05, P<0.0l), but there was no significant difference between stimulation groups A and C (P>0.05). Conclusions Percutaneous stimulation with middle-frequency pulse current in different diadynamic cycles in the hepatic region in recruits can reduce liver injury due to exercise-induced fatigue, promote the generation of energy source in vivo, accelerate the elimination of lactate, and improve the exercise endurance of recruits. It plays a role in relieving exercise-induced fatigue, and the efficacy of the middle frequency with 1,204 Hz and diadynamic cycles of 1 second is the best.
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