Hagberg J M, Coyle E F
Int J Sports Med. 1984 Apr;5(2):74-7. doi: 10.1055/s-2008-1025883.
Eight competitive racewalkers were studied to determine a) the speed where running and racewalking become equally efficient, b) if, at a similar VO2, the physiologic responses to submaximal exercise differ between running and racewalking, and c) if VO2 max can be attained during racewalking. The speed at which running and racewalking elicited the same VO2 (approximately 30 ml X kg-1 X min-1) was between 8 and 9 km X h-1. Racewalking was more efficient at slower speeds, and running was more efficient at faster velocities. When running and racewalking were compared at similar oxygen consumptions, heart rate, ventilation, perceived exertion, and respiratory exchange ratio responses were identical. During maximal exercise, running and racewalking resulted in a similar VO2 max (60.4 +/- 1.3 vs. 58.1 +/- 1.5 ml X kg-1 X min-1), heart rate (193 +/- 4 vs. 188 +/- 4 bpm), ventilation (130.6 +/- 5.9 vs. 126.3 +/- 6.6 l X min-1), and post-exercise blood lactic acid concentration (9.8 +/- 0.6 vs. 9.6 +/- 0.7 mM). These results indicate that the speed where racewalking and running become equally efficient is similar to the crossover speed for conventional walking and running. Cardiovascular, respiratory, and perceptual responses during running and racewalking are the same during maximal exercise and during submaximal exercise at the same VO2.
对八名竞技竞走运动员进行了研究，以确定：a）跑步和竞走效率相等时的速度；b）在相似的耗氧量下，跑步和竞走对次最大运动的生理反应是否不同；c）竞走过程中是否能达到最大耗氧量。跑步和竞走产生相同耗氧量（约30毫升×千克⁻¹×分钟⁻¹）时的速度在8至9千米×小时⁻¹之间。较慢速度下竞走更高效，较快速度下跑步更高效。当在相似的耗氧量下比较跑步和竞走时，心率、通气量、主观用力感觉和呼吸交换率反应是相同的。在最大运动期间，跑步和竞走导致的最大耗氧量相似（60.4±1.3对58.1±1.5毫升×千克⁻¹×分钟⁻¹）、心率相似（193±4对188±4次/分钟）、通气量相似（130.6±5.9对126.3±6.6升×分钟⁻¹）以及运动后血乳酸浓度相似（9.
