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目的考察30天-6°头低位卧床(模拟失重)对男性有氧运动耐力的影响并提供一种有效的防护策略。方法 14名健康男性志愿者(年龄18~25岁,身高170~178 cm,体重55~75 kg)参与30 d-6°头低位卧床实验,并被随机分为对照组(CG,n=7)和训练组(EG,n=7)。实验期间,对照组只进行单纯卧床,无任何训练;训练组每天进行1次卧位自行车功量计训练,持续时间为30 min,连续两天训练后第3天休息,训练强度为40%~80%VO2max。分别在卧床实验前1天、卧床第17天、卧床第30天、起床后第6天进行运动心肺功能测试,分析比较VO2max、运动耐受时间等参数。结果与卧床前相比,30 d卧床后对照组VO2max和运动耐受时间分别降低15.4%(P<0.05)和18%(P<0.05);而训练组VO2max的降低小于5%(P>0.05),并且运动耐受时间可保持卧床前水平。结论 30 d-6°头低位卧床导致男性有氧运动能力降低,本研究采用的自行车功量计训练方法能够有效对抗这种不利影响。
Objective To investigate the effect of 30 days -6 ° head-down bed rest (simulated weightlessness) on male aerobic endurance and to provide an effective protection strategy. Methods Fourteen healthy male volunteers (aged 18-25 years, 170-178 cm in height and 55-75 kg in weight) were enrolled in a 30 d-6 ° head-lying ambulatory low bed trial and were randomly divided into control group (CG, n = 7 ) And training group (EG, n = 7). During the experimental period, the control group only had to stay in bed without any training. The training group was trained once a day by a bicycle-borne dynamometer with a duration of 30 min and the rest for 3 days after two consecutive days of training. The training intensity was 40% 80% VO2max. Cardiopulmonary exercise tests were performed on day 1 before bedridden, day 17 in bed, day 30 in bed, and day 6 after getting up. The parameters of VO2max and exercise tolerance time were analyzed and compared. Results Compared with that before bedtime, the VO2max and exercise tolerance time in the control group after bed rest for 30 days were reduced by 15.4% (P <0.05) and 18% (P <0.05), respectively, while those in training group were less than 5% (P> 0.05 ), And exercise tolerance time to maintain bedtime levels. Conclusions The 30 d-6 ° head-down ambulation results in a decrease in male aerobic capacity. The bicycle power meter training method used in this study can effectively combat this adverse effect.