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EFFECTS OF EXERCISE TRAINING ON THERMOREGULATORY RESPONSES AND BLOOD VOLUME IN OLDER MEN

运动训练对老年男性体温调节反应和血容量的影响

基本信息

批准号：
11470015
负责人：
NOSE Hiroshi
金额：
$ 10.05万
依托单位：
Shinshu University SchooT of Medicine
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2001
项目状态：
已结题

项目摘要

We assessed the effects of aerobic/ resistance training on thermoregulatory responses in older men and analyzed the results in relation with changes in peak aerobic capacity ( VO_<2, peak> ) and blood volume ( BV ). Twenty male subjects ( age, 64±1yr; VO_<2, peak>, 32.8±1.2ml・kg^<-1>・min^<-1>, mean±SE ) were divided into 3 training regimens for 18 weeks; control ( C, n=7 ), aerobic training ( AT, n=8 ), and resistance training ( RT, n=8 ). Subjects in C were allowed to perform a walking of 〜10,000 steps a day, 6〜7days a week. Subjects in AT exercised on a cycle ergometer at 50-75 % VO_<2, peak> for 60 min a day, 3 days a week, besides the walking. Subjects in RT performed a resistance exercise including knee extension and flexion at 60-80 % of 1RM, 2-3 sets of 8 repetitions a day, 3 days a week, besides the walking. After training, VO_<2, peak> increased by 3.1±4.6% in C ( n.s. ), 14.3±2.4% in A ( p<0.01 ), and 8.4±2.9 % in R( p<0.05 ), but BV remained unchanged in all trials. Also, the esophageal temperature ( T_<es> ) thresholds for forearm skin vasodilation and sweating, determined during 30-min exercise of 60 % VO_<2, peak> at 30℃, increased in AT ( p<0.05 ) and RT ( p<0.05 ) but not in C ( P>0.0x ). In contrast, the slopes of forearm skin vascular conductance/ T_<es> and sweat rate/ T_<es>, remained unchanged in all trials, but increased in subjects with increased BV irrespective of trials. Thus, aerobic/ resistance training in older men increased VO_<2, peak> and lowered T_<es> threshold for forearm skin vasodilation and sweating, but did not increase BV. Further, the sensitivity of increase in skin vasodilation and sweating at a given increase in T_<es> was more associated with BV than VO_<2, peak>.

我们评估了有氧/耐力训练对老年男性体温调节反应的影响，并分析了结果与峰值有氧能力(VO&lt；2，PEAK&GT；)和血容量(BV)变化的关系。20名男性受试者(年龄：±1岁；VO&lt；2，Peak&Gt；，32.8±1.2ml·kg~(-1)；-1~gt；·min~(-1)，Mean±SE)，分为对照组(C，n=7)、有氧训练组(AT，n=8)和抗阻训练组(RT，n=8)。C组的受试者被允许每天步行约1万步，每周6~7天。AT组受试者除步行外，还进行50-75%VO_2、峰值&GT；的自行车运动，每天60分钟，每周3天。RT组受试者除步行外，还进行伸膝屈膝60%~80%的1rm阻力训练，2~3组，每天8次，每周3次。训练后，C组VO_2、PEAK&GT；提高了3.1±4.6%(N.S.)，A组14.3±2.4%(p&lt；0.01)，R组8.4±2.9%(p&lt；0.05)，但BV在所有试验中保持不变。同样，在60%VO_2运动30分钟时测得的前臂皮肤血管扩张和出汗的食道温度阈值(T&lt；ES&gt；)，在30℃时达到峰值，AT(p&lt；0.05)和RT(p&lt；0.05)升高，但C(P&gt；0.0x)无变化。相比之下，前臂皮肤血管传导性和出汗率的斜率在所有试验中都保持不变，但在BV增加的受试者中增加，与试验无关。因此，在老年男性中，有氧/耐力训练增加了VO_2，峰值和GT；并降低了前臂皮肤血管扩张和出汗的T_s&GT；阈值，但没有增加BV。此外，皮肤血管扩张和出汗增加的敏感度在T&lt；ES&gt；给定增加时与BV的相关性比VO&lt；2，PEAK&gt；更高。