为什么在跑步机上锻炼更累人
<p><span word="Question">Question</span>: <span word="Why">Why</span> <span word="do">do</span> <span word="I">I</span> <span word="find">find</span> <span word="it">it</span> <span word="more">more</span> <span word="difficult">difficult</span> <span word="and">and</span> <span word="tiring">tiring</span> <span word="when">when</span> <span word="I">I</span> <span word="take">take</span> <span word="my">my</span> <span word="walk">walk</span> <span word="on">on</span> <span word="a">a</span> <span word="treadmill">treadmill</span>?</p><p>问：为什么我发现在跑步机上走会觉得更吃力、更累？</p><p><span word="Answer">Answer</span>: <span word="Many">Many</span> <span word="people">people</span>, <span word="including">including</span> <span word="me">me</span>, <span word="find">find</span> <span word="a">a</span> <span word="treadmill">treadmill</span> <span word="workout">workout</span> <span word="more">more</span> <span word="draining">draining</span> <span word="than">than</span> <span word="the">the</span> <span word="same">same</span> <span word="activity">activity</span> <span word="on">on</span> <span word="a">a</span> <span word="sidewalk">sidewalk</span> <span word="or">or</span> <span word="track">track</span>. <span word="In">In</span> <span word="a">a</span> 2017 <span word="experiment">experiment</span>, <span word="runners">runners</span> <span word="were">were</span> <span word="asked">asked</span> <span word="to">to</span> <span word="jog">jog</span> <span word="on">on</span> <span word="a">a</span> <span word="track">track</span> <span word="while">while</span> <span word="rating">rating</span> <span word="how">how</span> <span word="difficult">difficult</span> <span word="the">the</span> <span word="exercise">exercise</span> <span word="felt">felt</span>. <span word="Then">Then</span> <span word="they">they</span> <span word="hopped">hopped</span> <span word="on">on</span> <span word="treadmills">treadmills</span> <span word="without">without</span> <span word="speed">speed</span> <span word="displays">displays</span> <span word="and">and</span> <span word="were">were</span> <span word="told">told</span> <span word="to">to</span> <span word="set">set</span> <span word="the">the</span> <span word="machine">machine</span> <span word="to">to</span> <span word="a">a</span> <span word="pace">pace</span> <span word="that">that</span> <span word="felt">felt</span> <span word="the">the</span> <span word="same">same</span> <span word="as">as</span> <span word="what">what</span> <span word="they">they</span> <span word="had">had</span> <span word="just">just</span> <span word="run">run</span>. <span word="Almost">Almost</span> <span word="all">all</span> <span word="chose">chose</span> <span word="a">a</span> <span word="speed">speed</span> <span word="that">that</span> <span word="was">was</span> <span word="much">much</span> <span word="slower">slower</span>. <span word="On">On</span> <span word="the">the</span> <span word="treadmill">treadmill</span>, <span word="this">this</span> <span word="gentle">gentle</span> <span word="pace">pace</span> <span word="felt">felt</span> <span word="as">as</span> <span word="difficult">difficult</span> <span word="as">as</span> <span word="swifter">swifter</span> <span word="running">running</span> <span word="on">on</span> <span word="the">the</span> <span word="track">track</span>.</p><p>答：很多人，包括我自己，发现在跑步机上比在人行道或跑道上进行同样的锻炼更累。在2017年的一项实验中，研究者要求跑步者在跑道上慢跑，同时评估这项锻炼的难度感受。然后他们跳到没有速度显示器的跑步机上，把速度设定为刚才慢跑时感觉的速度。几乎所有人选择的速度都慢得多。在跑步机上以较慢速度跑步与在跑道上以较快速度跑步的难度感觉是一样的。</p><p><span word="But">But</span> <span word="scientists">scientists</span> <span word="are">are</span> <span word="unsure">unsure</span> <span word="why">why</span> <span word="treadmill">treadmill</span> <span word="exercise">exercise</span> <span word="feels">feels</span> <span word="harder">harder</span>. <span word="Most">Most</span> <span word="people">people</span>’<span word="s">s</span> <span word="biomechanics">biomechanics</span> <span word="are">are</span> <span word="the">the</span> <span word="same">same</span>, <span word="whether">whether</span> <span word="they">they</span> <span word="are">are</span> <span word="on">on</span> <span word="a">a</span> <span word="treadmill">treadmill</span> <span word="or">or</span> <span word="the">the</span> <span word="ground">ground</span>, <span word="studies">studies</span> <span word="show">show</span>. <span word="And">And</span> <span word="where">where</span> <span word="there">there</span> <span word="are">are</span> <span word="differences">differences</span>, <span word="the">the</span> <span word="advantage">advantage</span> <span word="would">would</span> <span word="seem">seem</span> <span word="to">to</span> <span word="reside">reside</span> <span word="with">with</span> <span word="the">the</span> <span word="machine">machine</span>. <span word="Treadmill">Treadmill</span> <span word="jogging">jogging</span> <span word="is">is</span> <span word="less">less</span> <span word="jarring">jarring</span> <span word="than">than</span> <span word="running">running</span> <span word="on">on</span> <span word="the">the</span> <span word="ground">ground</span>, <span word="for">for</span> <span word="instance">instance</span>. <span word="A">A</span> 2017 <span word="study">study</span> <span word="shows">shows</span> <span word="that">that</span> <span word="we">we</span> <span word="strike">strike</span> <span word="the">the</span> <span word="ground">ground</span> <span word="with">with</span> <span word="about">about</span> 200 <span word="percent">percent</span> <span word="of">of</span> <span word="our">our</span> <span word="body">body</span> <span word="weight">weight</span> <span word="while">while</span> <span word="running">running</span> <span word="on">on</span> <span word="the">the</span> <span word="track">track</span> <span word="and">and</span> <span word="only">only</span> 175 <span word="percent">percent</span> <span word="of">of</span> <span word="our">our</span> <span word="body">body</span> <span word="weight">weight</span> <span word="when">when</span> <span word="we">we</span> <span word="are">are</span> <span word="on">on</span> <span word="a">a</span> <span word="treadmill">treadmill</span>.</p>
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