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

1. 跑步训练对急性生理应激大鼠心血管反应的影响。体能训练为30米/分钟跑步1小时/天，每周5天。经过八周的训练，大鼠被用于实验。体力应激（以20米/分钟的速度跑15分钟）引起的心率和血压反应在训练组中有所降低。跑步训练对换笼应激大鼠心血管反应的影响。经过8周的训练，同样的老鼠暴露在换笼压力下。将大鼠置于新环境后，血压和心率显著升高。对照组与训练组换笼应激引起的血压和心率反应差异无统计学意义。跑步训练对应激大鼠促肾上腺皮质激素（ACTH）反应的影响。游泳应激诱导的ACTH反应在4周和10周后，以20米/分钟的速度训练1小时/天，每周5天，显著降低。训练还减弱了由笼子开关应激引起的ACTH反应，表明发生了交叉适应。运动强度训练对大鼠换笼应激时ACTH和儿茶酚胺反应的影响。三组大鼠分别以10 m/min、20 m/min、30 m/min三种不同的跑步速度进行训练，每天1小时，每周5天。经过8周的训练，大鼠暴露在换笼压力下。本实验提示，训练强度影响切换笼应激诱导的ACTH交叉适应和儿茶酚胺反应。

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.