Cardiac Output and Performance during a Marathon Race in Middle-Aged Recreational Runners

<table>running speed (as a percentage of speed at <svg height="17.174999" id="M67" style="vertical-align:-3.22282pt" version="1.1" viewbox="0 0 53.099998 17.174999" width="53.099998" xmlns="http://www.w3.org/2000/svg">
<g transform="matrix(1.25,0,0,-1.25,0,17.175)">
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<tspan style="font-size: 12.50px; " x="-7.3899999" y="2.6500001">V</tspan>
<tspan style="font-size: 12.50px; " x="1.637166" y="2.6500001">O</tspan>
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<text transform="matrix(1,0,0,-1,-53.9,58.4)">
<tspan style="font-size: 8.75px; " x="0" y="0">2</tspan>
<tspan style="font-size: 8.75px; " x="5.837584" y="0">m</tspan>
<tspan style="font-size: 8.75px; " x="12.64664" y="0">a</tspan>
<tspan style="font-size: 8.75px; " x="16.532528" y="0">x</tspan>
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</svg>) decreases during the marathon.</table>

The Scientific World Journal

fig1

Figure 1

Figure 1: Cardiac Output and Performance during a Marathon Race in Middle-Aged Recreational Runners 