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Runners need to move 15 per cent faster on a treadmill to burn the same number of calories as jogging outdoors, research reveals. 一项研究表明，跑步者在跑步机上的速度要比户外慢跑快15%，才能与其燃烧同等热量。 Researchers from Milan University analysed the difference between running outdoors or on a treadmill in 15 physically fit males with an average age of 21. 意大利米兰大学的研究人员分析了平均年龄为21岁的15名健康男子去户外跑步与在跑步机上跑步的差异。 The participants sprinted for 30 seconds followed by 30 seconds of recovery for a total of 15 minutes both outdoors and on a treadmill. 参与者先快跑30秒，然后休息30秒，这样分别在户外和跑步机上运动15分钟。 | 
