摘要
目的探讨高原环境运动负荷状态下人体心率变化规律,建立高原适宜劳动强度评价方法。方法采用亚极量踏阶运动试验,在平原(海拔300 m)和高原(海拔3700、4200、4600和5100 m)环境对228例受试者测定了不同运动负荷状态下运动心率和恢复心率,计算了最大氧耗量(VO2max)、心率变化幅度(X)和相对心率综合指标(Z)。结果与平原相比,高原3700~5100 m受试者VO2max显著下降(41.74±2.96,41.25±2.84,41.08±2.35,41.60±2.82 vs 46.61±3.74 mL·kg^-1·min^-1,P<0.05);相对心率综合指标Z值随着心率变化幅度X值的增加而呈线性的增加(Z=0.920+0.006X,R2=0.794);受试者中度劳动强度Z值(1.42±0.21)显著小于重度劳动强度(1.52±0.23,P<0.05)。结论高原环境人体劳动能力显著下降,高原适宜劳动强度宜在中度劳动强度范围内,Z=1.42可作为高原环境中度劳动强度判定依据。
Objective To explore the law of the change of human heart rate under plateau environmental exercise load and establish an evaluation method of optimal labor intensity at plateau.Methods Sub-polar treadmill exercise test was used to measure the exercise heart rate and recovery heart rate of 228 subjects under different exercise load conditions at plain(altitude 300 m)and plateau(altitude 3700,4200,4600 and 5100 m).The maximum oxygen consumption(VO2max),heart rate change amplitude(X)and relative heart rate comprehensive index(Z)were calculated.Results Compared with the plain,VO2max of subjects from 3700 m to 5100 m at high altitude was decreased significantly(41.74±2.96,41.25±2.84,41.08±2.35,41.60±2.82 vs 46.61±3.74 mL·kg^-1·min^-1,P<0.05).The Z value of the relative heart rate comprehensive index was increases linearly with the increase of the X value of the heart rate change amplitude(Z=0.920+0.006X,R2=0.794).The Z value of moderate labor intensity(1.42±0.21)was obviously lower than that of severe labor intensity(1.52±0.23,P<0.05).Conclusion Plateau environment significantly decreases the labor capacity of human body.So,the suitable labor intensity at plateau should be within the range of moderate labor intensity.Z=1.42 can be used as the cut-off value for judging moderate labor intensity in plateau environment.
作者
张钢
李鹏
王开发
高钰琪
ZHANG Gang;LI Peng;WANG Kaifa;GAO Yuqi(Key Laboratory of High Altitude Medicine of PLA,Key Laboratory of Extreme Environmental Medicine of Ministry of Education,Faculty of High Altitude Military Medicine,Chongqing,400038,China;Faculty of Bioengineering Medicine,Army Medical University(Third Military Medical University),Chongqing,400038,China)
出处
《第三军医大学学报》
CAS
CSCD
北大核心
2020年第9期948-952,共5页
Journal of Third Military Medical University
基金
全军后勤科研“十二五”重大项目(AWS14L005)。
关键词
相对心率
高原
适宜运动强度
氧耗量
运动心率
relative heart rate
plateau
optimal labor intensity
oxygen consumption
exercise heart rate
