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<p style="font-size: 18pt; font-weight:bold; font-family:arial, 'sans-serif';"><a href="http://www.hesfit.com/men/comment/dr-mirkin-fatigue-or-heatstroke-know-when-to-stop-exercising/">Dr. Mirkin - Fatigue or Heatstroke? Know when to stop exercising</a></p> <p style="font-size: 10pt; font-weight:normal; font-family:arial, 'sans-serif';">Posted June 29, 2007 at 11:00 AM by Bridget Sullivan</p> <p style="font-size: 10pt; font-weight:normal; font-family:arial, 'sans-serif'">After you have played a long tennis match on a hot summer day, you feel weaker and less accurate with your shots. The fatigue, muscle weakness, tired aching feeling and decreased coordination that you get in any sport lasting several hours is caused by low levels of fluids, salt or calories. There are no early warning signals. By the time you feel hungry, you have already run low on calories and are ready to crash. By the time you feel thirsty, you are already severely dehydrated and feel weak and tired. By the time you are low on salt, you already have tired, aching or burning muscles; feel weak, tired and dizzy; and may already have muscle cramps. The primary limiting factor in sports that require great endurance is the time it takes for your heart to pump oxygen in your…<a href="http://www.hesfit.com/men/comment/dr-mirkin-fatigue-or-heatstroke-know-when-to-stop-exercising/">(<a href="http://www.hesfit.com/men/comment/dr-mirkin-fatigue-or-heatstroke-know-when-to-stop-exercising/">Continued...</a>)<br clear="all" /><br> <p style="font-size: 10pt; font-weight:normal; font-family:arial, 'sans-serif'"><a href="http://www.hesfit.com/men/comment/dr-mirkin-fatigue-or-heatstroke-know-when-to-stop-exercising/">Read the full article...</a> | <a href="http://www.hesfit.com/men/comment/dr-mirkin-fatigue-or-heatstroke-know-when-to-stop-exercising/">Comment on this post</a></p> <p style="font-size: 10pt; font-weight:normal; font-family:arial, 'sans-serif'">Filed under: <a href="http://www.hesfit.com/men/archive/category/in-the-news/">in-the-news</a>, <a href="http://www.hesfit.com/men/archive/category/his-fitness/">his-fitness</a>, <a href="http://www.hesfit.com/men/archive/category/injuries-rehab/">injuries-rehab</a>, <a href="http://www.hesfit.com/men/archive/category/his-health/">his-health</a>, <a href="http://www.hesfit.com/men/archive/category/physical-health/">physical-health</a><br /><br /> </P>