A cross-adaptation in the cardiovascular and hormonal responses in rats to differene types of stress by physical training

1.跑步训练对急性运动应激大鼠心血管反应的影响：以30m/min的速度跑1h/d，每周5天进行体能训练。经过8周的训练后，用大鼠进行实验。结果：1.训练组体力应激(20m/min跑步15min)引起的心率和血压反应降低。跑步训练对大鼠转笼应激心血管反应的影响。训练8周后，相同的大鼠暴露于转笼应激。将大鼠置于新的环境中后，血压和心率显著增加。对照组和训练组对笼式应激引起的血压和心率反应差异无统计学意义。跑步训练对不同类型应激大鼠促肾上腺皮质激素(ACTH)反应的影响每周5天，以20m/min的速度跑1h/d，训练4周和10周后，游泳应激诱导的ACTH反应明显降低。训练还减弱了笼式转换应激诱导的ACTH反应，提示发生了交叉适应。运动强度对大鼠转笼应激后促肾上腺皮质激素和儿茶酚胺反应的影响3组大鼠分别以10m/min、20m/min和30m/min三种不同速度训练1h/d，每周5天。经过8周的训练后，大鼠暴露在笼子切换应激下。本实验提示，运动强度影响笼式转换应激引起的ACTH和儿茶酚胺反应的交叉适应。

1. Effect of running training on the cardiovascular responses in rats to acute physical stress.Physical training was performed by running at 30 m/min for 1h/day, 5 days a week. After eight weeks of training, rats were used in the experiments. The heart rate and blood pressure responses induced by physical stress (running at 20 m/min for 15 min) were reduced in the training group.2. Effect of running training on the cardivascular responses in rats to cage-switch stress.After eight weeks of training same rats were exposed to cage-switch stress. After the rats were placed in the novel environment, blood pressure and heart rate significantly increased. There were no statistically significant differences between blood pressure and heart rate responses induced by cage-switch stress in the control group and those in the training group.3. Effect of running training on adrenocorticotrophic hormone (ACTH) responses in rats to different types of stress.The ACTH response induced by swimming stress was significantly reduced after 4 and 10 weeks of training by running at 20 m/min for 1h/day, 5 days a week. The training also attenuated the ACTH response induced by cage-switch stress, suggesting that a cross-adaptation occurred.4. Effect of exercise intensity for training on ACTH and catecholamine responses in rats to cage-switch stress.Three training groups of rats were trained by running at three different speeds (10 m/min, 20 m/min and 30 m/min) for 1h/day, 5 days a week. After eight weeks of training rats were exposed to cage-switch stress. This experiment suggests that exercise intensity for training affects the cross-adaptation in the ACTH and the catecholamine responses induced by cage-switch stress.