心率作为评价体力劳动强度优选指标的探讨

摘要

目的 探讨心率作为评价体力劳动强度优选指标的可能性.方法 于2015年9至10月,选择111名男性青年为研究对象,采用功率自行车运动方式,进行不同强度(20、40、60、80、100、120、140、160、180W)的运动人体试验,每一运动强度持续6 min;受试者佩戴K4b2便携式心肺功能仪,实时监测运动中的心率(HR)、肺通气量(Ve)、氧耗量(VO2)和能量代谢率(E).采用Origin分析软件,对各强度下采集的HR、Ve、VO2和E进行相关分析和回归分析,建立Ve-HR、VO2-HR、E-HR回归关系方程.结果 不同运动强度下,HR与Ve、VO2、E均呈正相关(r=0.898 5、0.873 3、0.897 3,P＜0.01);HR与Ve、VO2和E建立回归方程的R2值分别为0.807 0、0.762 5、0.804 9,差异均有统计学意义(P＜0.01).验证结果显示,经方程推算值与实际测量值差异无统计学意义(P＞0.05).结论 HR可能替代Ve、VO2和E,作为评价体力劳动强度的优选指标.%Objective To investigate the possibility of heart rate as an optimum index for evaluating physical labor intensity.Methods From September to October,2015,a total of 111 male young adults were selected as study subjects.A cycle ergometer was used for exercise at different intensities (20,40,60,80,100,120,140,160,and 180 W),and the exercise at each intensity lasted for 6 minutes.The subjects wore the K4b2 portable cardiopulmonary function testing instrument for the real-time monitoring of heart rate (HR),pulmonary ventilation volume (Ve),oxygen consumption (VO2),and energy metabolic rate (E).The origin software was used for correlation and regression analyses of HR,Ve,VO2,and E collected at different intensities to establish VeHR,VO2-HR,and E-HR regression equations.Results At different intensities,HR was positively correlated with Ve,VO2,and E(r=0.8985,0.8733,and 0.8973,all P＜0.01).There was a significant difference in the R2 value of Ve-HR,VO2-HR,and E-HR regression equations (R2=0.8070,0.7625,and 0.8049,all P ＜0.01).The validation results showed that there was no significant difference between the calculated values and the measured ones (P＞ 0.05).Conclusion HR can replace Ve,VO2,and E and be used as an optimum index for evaluating physical labor intensity.