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Some trainers also ask players to monitor their urine color, which offers a good indication of hydration status. (Dark, apple juice color urine means the player is dehydrated; lighter, lemonade color means the player is hydrated.)
Then there's the cooling-down process. Players are encouraged to remove their helmets in between drills to allow for ventilation. Trainers provide cold towels or sponges during practice, and the ever-popular ice tubs after practice, with a goal of reducing a player's core body temperature.
"You have to be a pro and part of that is to keep yourself hydrated," says Panthers linebacker Luke Kuechly, the 2012 Defensive Rookie of the Year. "It's really up to you, and it's not hard to stay hydrated or to find something to drink. You can have anything you need and they expect you to stay hydrated.
"One of the things I am not sure everyone would know, a lot of hydration comes from the day before and night before. If I do a good job, I don't have to load up and kind of get bloated or heavy."
One issue that doesn't crop up is a player hiding his condition. Casa and Mayer say there's a "buddy system" through which players watch out for each other in the heat.
"By far the biggest indication is an altered mental status, when it does not seem to be the same person in front of you," Casa says. "Some feel excessively hot, feel excessive fatigue, act a little bizarre or different. It's especially true for someone coming off an injury or illness."
So while the idea of trying to make the team at all costs might seem valiant, it is short-sighted and foolish.
The NFLPA's Mayer believes anyone who even gets a look from the NFL should know better, but he recognizes the personality traits that have made them successful.
"All these guys already have been on the right end of the performance spectrum, from junior high to high school to college," Mayer says. "Then, the next thing they know, they are in the league. They always have exceeded expectations, are highly driven and high performance.
"Think about what they do in the offseason and in the weight room, with guys pushing and pushing to have (the most) strength or speed. They are used to training for that.
"And once we start now in camps, they have to make sure not to push it, and to be really careful about the heat. It's incumbent on all of us to be really careful about the heat."
|Pittsburgh - LP: F. Liriano||0||FINAL|
|Cincinnati - WP: J. Cueto||4|
|Tampa Bay - LP: J. Odorizzi||0||FINAL|
|Baltimore - WP: M. Gonzalez||3|
|Chicago Cubs - LP: J. Hammel||0||FINAL|
|NY Yankees - WP: M. Tanaka||3|
|St. Louis - LP: J. Kelly||1||FINAL|
|Milwaukee - WP: W. Peralta||5|
|NY Mets - WP: D. Gee||5||FINAL|
|Arizona - LP: B. McCarthy||2|
|Atlanta - WP: J. Teheran||1||FINAL|
|Philadelphia - LP: C. Lee||0|
|Chicago Cubs - LP: T. Wood||0||FINAL|
|NY Yankees - WP: M. Pineda||2|
|Cleveland - WP: Z. McAllister||3||FINAL|
|Detroit - LP: A. Sanchez||2|
|Washington - WP: D. Storen||6||FINAL|
|Miami - LP: M. Dunn||3|
|Seattle - LP: F. Rodney||2||FINAL|
|Texas - WP: P. Figueroa||3|
|Boston - WP: C. Capuano||6||FINAL|
|Chicago WSox - LP: L. Garcia||4|
|Kansas City - WP: D. Duffy||6||FINAL|
|Houston - LP: J. Williams||4|
|Oakland - LP: D. Pomeranz||4||FINAL|
|LA Angels - WP: J. Smith||5|
|Colorado - LP: J. De La Rosa||2||FINAL|
|San Diego - WP: A. Cashner||4|
|Los Angeles - LP: J. Howell||1||FINAL|
|San Francisco - WP: J. Machi||2|
|Red Bull New York||2|
|Aug 9 - vs. Houston||7 pm||X||27-13|
|Aug 16 - at Buffalo||6 pm||X||20-16|
|Aug 25 - at San Francisco||7 pm||X||34-14|
|Aug 29 - vs. Tennessee||7 pm||X||24-23|
|2013 regular season|
|Sep 8 - at Detroit||Noon||X||34-24|
|Sep 15 - at Chicago||Noon||X||31-30|
|Sep 22 - vs. Cleveland||Noon||X||31-27|
|Sep 29 - vs. Pittsburgh (in London)||Noon||X||34-27|
|Oct 6 - Bye|
|Oct 13 - vs. Carolina||Noon||X||35-10|
|Oct 21 - at. NY Giants||7:40 pm||X||23-7|
|Oct 27 - vs. Green Bay||7:30 pm||X||44-31|
|Nov 3 - at Dallas||Noon||X||27-23|
|Nov 7 - vs. Washington||7:25 pm||X||34-27|
|Nov 17 - at Seattle||3:25 pm||X||41-20|
|Nov. 24 - at Green Bay||Noon||26-26|
|Dec 1 - vs. Chicago||Noon||X||23-20|
|Dec 8 - at Baltimore||Noon||X||29-26|
|Dec 15 - vs. Philadelphia||Noon||X||48-30|
|Dec 22 - at Cincinnati||Noon||X||42-14|
|Dec 29 - vs. Detroit||Noon||X||14-13|