但是科学家们不确定为什么在跑步机锻炼感觉更吃力。多项研究表明,不管在跑步机上还是在地面上,大多数人的生物力学是一样的。如果说有区别的话,跑步机似乎更有优势。比如,在跑步机上慢跑比在地面上的震动更小。2017年的一项研究表明,我们在跑道上跑步时,撞击地面的力量相当于体重的约200%,而在跑步机上,撞击力量只有体重的175%。
So the most likely explanation for any drudgery associated with treadmill exercise is psychological. Treadmills are indoor machines, and many studies show that people generally prefer outdoor workouts. In various experiments, people have reported experiencing less fatigue, more vitality and greater pleasure after walking outside compared with on an indoor treadmill.
所以用跑步机锻炼更累人的原因很可能是心理方面的。跑步机是室内机器,而很多研究表明,人们总体来说更喜欢户外锻炼。人们在不同的实验中报告称,与在室内跑步机上锻炼后相比,在户外散步后感觉不那么累,更有活力,更愉悦。
Also, treadmills typically provide a walk to nowhere, which may be demoralizing. In a study published last year, volunteers who set out to walk a course that had no clear finish line felt more fatigued afterward than when they covered the same distance with an obvious finish line ahead on which to focus.
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