多运动也许真的可以令你老得慢
<p><span word="Almost">Almost</span> <span word="any">any</span> <span word="amount">amount</span> <span word="and">and</span> <span word="type">type</span> <span word="of">of</span> <span word="physical">physical</span> <span word="activity">activity</span> <span word="may">may</span> <span word="slow">slow</span> <span word="aging">aging</span> <span word="deep">deep</span> <span word="within">within</span> <span word="our">our</span> <span word="cells">cells</span>, <span word="a">a</span> <span word="new">new</span> <span word="study">study</span> <span word="finds">finds</span>. <span word="And">And</span> <span word="middle">middle</span> <span word="age">age</span> <span word="may">may</span> <span word="be">be</span> <span word="a">a</span> <span word="critical">critical</span> <span word="time">time</span> <span word="to">to</span> <span word="get">get</span> <span word="the">the</span> <span word="process">process</span> <span word="rolling">rolling</span>, <span word="at">at</span> <span word="least">least</span> <span word="by">by</span> <span word="one">one</span> <span word="common">common</span> <span word="measure">measure</span> <span word="of">of</span> <span word="cell">cell</span> <span word="aging">aging</span>.</p><p>一项新研究发现，不论运动量如何，几乎所有种类的体育活动都能延缓深藏于我们细胞内部的衰老过程。而中年可能是让这一机制继续运行下去的关键时段，至少，就衡量细胞衰老的一个常用指标而言确是如此。</p><p><span word="Dating">Dating</span> <span word="a">a</span> <span word="cell">cell</span>’<span word="s">s</span> <span word="age">age</span> <span word="is">is</span> <span word="tricky">tricky</span>, <span word="because">because</span> <span word="its">its</span> <span word="biological">biological</span> <span word="and">and</span> <span word="chronological">chronological</span> <span word="ages">ages</span> <span word="rarely">rarely</span> <span word="match">match</span>. <span word="A">A</span> <span word="cell">cell</span> <span word="could">could</span> <span word="be">be</span> <span word="relatively">relatively</span> <span word="young">young</span> <span word="in">in</span> <span word="terms">terms</span> <span word="of">of</span> <span word="how">how</span> <span word="long">long</span> <span word="it">it</span> <span word="has">has</span> <span word="existed">existed</span> <span word="but">but</span> <span word="function">function</span> <span word="slowly">slowly</span> <span word="or">or</span> <span word="erratically">erratically</span>, <span word="as">as</span> <span word="if">if</span> <span word="elderly">elderly</span>.</p><p>确定细胞的年龄可是个棘手差事，因为它们的生物学年龄（表明其组织结构和生理功能的状态）和实际年龄基本上对不上号。有些细胞论其存在时间可能还算年轻，但它们执行起生理机能来却十分缓慢或者不稳定，就如同衰老的细胞一样。</p><p><span word="Today">Today</span>, <span word="many">many</span> <span word="scientists">scientists</span> <span word="have">have</span> <span word="begun">begun</span> <span word="determining">determining</span> <span word="a">a</span> <span word="cell">cell</span>’<span word="s">s</span> <span word="biological">biological</span> <span word="age">age</span> — <span word="meaning">meaning</span> <span word="how">how</span> <span word="well">well</span> <span word="it">it</span> <span word="functions">functions</span> <span word="and">and</span> <span word="not">not</span> <span word="how">how</span> <span word="old">old</span> <span word="it">it</span> <span word="literally">literally</span> <span word="is">is</span> — <span word="by">by</span> <span word="measuring">measuring</span> <span word="the">the</span> <span word="length">length</span> <span word="of">of</span> <span word="its">its</span> <span word="telomeres">telomeres</span>.</p><p>如今，许多科学家开始通过测量细胞的端粒长度来确定它的生物学年龄。</p><p><span word="For">For</span> <span word="those">those</span> <span word="of">of</span> <span word="us">us</span> <span word="who">who</span> <span word="don">don</span>’<span word="t">t</span> <span word="know">know</span> <span word="every">every</span> <span word="portion">portion</span> <span word="of">of</span> <span word="our">our</span> <span word="cells">cells</span>’ <span word="interiors">interiors</span>, <span word="telomeres">telomeres</span> <span word="are">are</span> <span word="tiny">tiny</span> <span word="caps">caps</span> <span word="found">found</span> <span word="on">on</span> <span word="the">the</span> <span word="end">end</span> <span word="of">of</span> <span word="DNA">DNA</span> <span word="strands">strands</span>, <span word="like">like</span> <span word="plastic">plastic</span> <span word="aglets">aglets</span> <span word="on">on</span> <span word="shoelaces">shoelaces</span>. <span word="They">They</span> <span word="are">are</span> <span word="believed">believed</span> <span word="to">to</span> <span word="protect">protect</span> <span word="the">the</span> <span word="DNA">DNA</span> <span word="from">from</span> <span word="damage">damage</span> <span word="during">during</span> <span word="cell">cell</span> <span word="division">division</span> <span word="and">and</span> <span word="replication">replication</span>.</p>
页:
[1]