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" Had a stressful day at work? It may make your evening jog feel harder, finds a new study...British researchers asked volunteers to take a demanding, 90-minute test that was designed to make them mentally exhausted. Then the study participants hopped on a stationary bicycle and exercised to exhaustion, while the researchers tracked their heart rate and other vital signs. On a different day, the same group watched a 90-minute documentary film before riding the bike. Mental fatigue did not affect the performance of the heart or muscles, but it did affect their &amp;quot;perceived effort,&amp;quot; say researchers. Translation: Even though volunteers expended about the same amount of energy exercising, they stopped riding the bike 15 percent earlier when their brains were fried. Working out just felt harder. Are you more likely to skip the gym (or cut your session short) after you&amp;#x27;ve had an exhausting day at work? Or do you find that exercise is a great way to blow off steam? Photo: iStock"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.glamour.com/health-fitness/blogs/vitamin-g/2009/03/the-surprising-reason-your-wor>