Out on a limb: science unveils secrets of swing | Science

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} function getOmnitureData_30959198001() { var omniture = new Object(); omniture.prop43="Video"; omniture.prop44="Video: Out on a limb"; omniture.prop45="Out on a limb: science unveils secrets of swing:Article:1254918"; omniture.eVar43="Video"; omniture.eVar44="Video: Out on a limb"; omniture.eVar45="Out on a limb: science unveils secrets of swing:Article:1254918"; return omniture; } </script> <div class="hide-on-popup"> <script type="text/javascript" src="http://web.archive.org/web/20090729221719js_/http://static.guim.co.uk/static/77051/common/scripts/eolas_workaround.js"></script> <script type="text/javascript"> (function() { var flashVars = "playerID=26396137001&@videoPlayer=30959198001&domain=embed&autoStart=false&adServerURL=http%3A%2F%2Fads.guardian.co.uk%2Fhtml.ng%2Fspacedesc%3Dvideo%26system%3Dvideo%26title%3D30959198001%26site%3DScience%26url%3D%25252Fscience%25252Fvideo%25252F2009%25252Fjul%25252F29%25252Fwalking-moving-your-arms-energy%26comfolder%3DNotcommerciallyuseful%26keywords%3DHuman%252Bbehaviour%252B%2528Science%2529%252CScience%26bandwidth%3Dbroadband%26tile%3D2017210"; insertVideoObject(460, 370, "http://web.archive.org/web/20090729221719/http://c.brightcove.com/services/viewer/federated_f9/26396137001?isVid=1&isUI=1&publisherID=281851582", flashVars) }) (); </script> </div> <span class="caption"> <a name="&lid={inBodyVideo}{Link to this video}&lpos={inBodyVideo}{1}" href="http://web.archive.org/web/20090729221719/http://www.guardian.co.uk/science/video/2009/jul/29/walking-moving-your-arms-energy">Link to this video</a> </span> </span> <p><strong></strong><strong></p><p></strong>Most of us never stray from the basic swing. A few of us dabble with the double swing. And then there are the curious few who indulge in an ungainly swing that goes the opposite way to everyone else's. It has long been argued that the way we move our arms when walking is a vestige of our ancestral life on all fours. But scientists have never nailed down exactly why we do it – until now.</p><span class="inline embed embed-media"> <script type="text/javascript"> //<![CDATA[ //]]> </script> <noscript> <object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" codebase="http://web.archive.org/web/20090729221719oe_/http://fpdownload.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=8,0,0,0" width="300" height="25" id="audioplayer" align="middle"> <param name="allowScriptAccess" value="always"/> <param name="movie" value="http://static.guim.co.uk/static/77051/common/flash/guMiniPlayer.swf"/> <param name="FlashVars" value="linktext=Ian Sample on the science of walking&publication_date=&file=http://download.guardian.co.uk/audio/kip/standalone/science/1248847760721/9476/gdn.new.090729.pm.science-walking.mp3&popupurl=http://www.guardian.co.uk/science/audio/2009/jul/29/walking-theory-science?popup=true&popupheight=232&popupwidth=500&duration=187&audioid=350924809"/> <param name="quality" value="high"/> <param name="bgcolor" value="#ffffff"/> <param name="wmode" value="transparent"/> <embed src="http://web.archive.org/web/20090729221719oe_/http://static.guim.co.uk/static/77051/common/flash/guMiniPlayer.swf" quality="high" bgcolor="#ffffff" width="300" height="25" name="audioplayer" align="middle" allowscriptaccess="always" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" flashvars="linktext=Ian Sample on the science of walking&publication_date=&file=http://download.guardian.co.uk/audio/kip/standalone/science/1248847760721/9476/gdn.new.090729.pm.science-walking.mp3&popupurl=http://www.guardian.co.uk/science/audio/2009/jul/29/walking-theory-science?popup=true&popupheight=232&popupwidth=500&duration=187&audioid=350924809"/> </object> </noscript> <script type="text/javascript" src="http://web.archive.org/web/20090729221719js_/http://static.guim.co.uk/static/77051/common/scripts/eolas_workaround.js"></script> <div id="flash-player"> <script type="text/javascript"> insertAudioPlayer("300", "25", "http://web.archive.org/web/20090729221719/http://static.guim.co.uk/static/77051/common/flash/guMiniPlayer.swf", "linktext=Ian Sample on the science of walking&publication_date=&file=http://download.guardian.co.uk/audio/kip/standalone/science/1248847760721/9476/gdn.new.090729.pm.science-walking.mp3&popupurl=http://www.guardian.co.uk/science/audio/2009/jul/29/walking-theory-science?popup=true&popupheight=232&popupwidth=500&duration=187&audioid=350924809"); </script> </div> <span class="caption"> Ian Sample on why swinging our arms helps us walk more efficiently <a name="&lid={inBodyAudio}{Link to this audio}&lpos={inBodyAudio}{1}" href="http://web.archive.org/web/20090729221719/http://www.guardian.co.uk/science/audio/2009/jul/29/walking-theory-science">Link to this audio</a> </span> </span><p>The secrets of swing have been laid out in research published today by a biomechanics expert, Steve Collins, at the Delft University in the Netherlands.</p><p>Those who don't swing put an unnecessary burden on their bodies and burn too much energy, he found, while those who swing their arms and legs in synch are in danger of careering off course.</p><p>Collins studied volunteers as they strolled on a treadmill. Some walked normally, some clamped their arms to their sides, while others swung both arms in unison. Another group tried the "Sears catalogue walk", in which the right arm goes forward with the right leg and vice-versa.</p><p>Monitoring the volunteers' metabolism showed that keeping our arms still as we stroll burns up 12% more energy than swinging them normally. The clumsy anti-swing walk, in which the arm and leg on one side go forward together, uses 26% more energy, as our muscles fight to keep us on course, according to a report in the journal <a href="http://web.archive.org/web/20090729221719/http://rspb.royalsocietypublishing.org/">Proceedings of the Royal Society B</a>.</p><p>The findings are likely to help researchers improve exercises used to rehabilitate patients learning to walk again after injury.</p> </div> </div> <div id="related"> <ul id="article-toolbox-side"> <li class="printable"><a href="http://web.archive.org/web/20090729221719/http://www.guardian.co.uk/science/2009/jul/29/science-walking-secrets-swing/print" rel="nofollow" id="printlink" class="printable rollover" title="Link to a printer-friendly version" name="&lid={pageToolbox}{Printer-friendly version}&lpos={pageToolbox}{1}"><img src="http://web.archive.org/web/20090729221719im_/http://static.guim.co.uk/static/77051/common/images/icon_print.gif" alt="Print this" 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