中国南方中青年体力活动能量消耗研究

目的研究中国南方中青年常见体力活动的能量消耗。方法通过问卷调查和体格检查筛选出轻体力活动健康中青年64名,采用k4b2便携式心肺功能测定仪测量其基础代谢和七项体力活动(慢走、快走、慢跑、骑自行车、上下楼梯和看电视)的耗氧量(VO2)和二氧化碳生成量(VCO2),用微量凯式定氮法测量24小时尿氮,利用Weir公式计算其能量消耗量。结果各项体力活动平均能量消耗量(kJ·h-1·kg-1)分别为:慢走14.77±2.47,快走22.18±3.68,慢跑41.34±7.32,骑自行车18.41±3.89,上楼梯26.11±4.18,下楼梯13.68±2.89,看电视5.06±1.09;男性各项体力活动能量消耗量均高于女性(P<0.05)。结论体力活动能量消耗差异较大,看电视为低强度体力活动,骑自行车、上下楼、慢走及快走为中强度体力活动,慢跑为高强度体力活动。

Energy expenditure at physical activities of young and middle-aged adults in southern China

Objective To investigate the energy expenditure at physical activities of young and middle-aged adults in southern China.Methods 64 healthy young and middle-aged adults living on light physical activity intensity were recruited by questionnaire and physical examination.A Cosmed k4b2 portable metabolic unit was used to measure the oxygen consumption(VO2) and carbon dioxide production(VCO2) at a status of basic metabolism and during seven physical activities,including slow walking,brisk walking,walking upstairs,walking downstairs,watching TV,jogging and bicycling.The urinary nitrogen excreted in 24 hours was detected by a standard Kjeldahl method.Energy expenditure at physical activities was calculated by Weir equation.Results The energy expenditure(kJ·h-1·kg-1) at physical activities were 14.77 ± 2.47 for slow walking,22.18 ± 3.68 for brisk walking,41.34 ± 7.32 for jogging,18.41 ± 3.89 for bicycling,26.11 ± 4.18 for walking upstairs,13.68 ± 2.89 for walking downstairs and 5.06 ± 1.09 for watching TV.The energy expenditure of males at physical activities was higher than those of females(P < 0.05).Conclusion There is a significant difference among energy expenditures at different physical activities;watching TV is a physical activity in light intensity;slow walking,brisk walking,walking upstairs,walking downstairs and bicycling are physical activities in moderate intensity,and jogging is a vigorous physical activity.