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Created page with "[[File:NikePrecoolVest.jpg|right|thumb|300px|The Nike Precool Vest, made for the Beijing Olympics and not sold to the public. There are alternatives from [http://www.ritetempa..."
[[File:NikePrecoolVest.jpg|right|thumb|300px|The Nike Precool Vest, made for the Beijing Olympics and not sold to the public. There are alternatives from [http://www.ritetempathletics.com/products_vests.shtml Rite Temp] and [http://www.hyperwear.com/discover/hyper-vest-cool.html/ Hyper Wear].]]
Exercise produces not only movement, but also heat, and this heat can be a limiting factor in performance. A number of studies have shown the cooling the body to slightly lower than normal temperatures can improve performance in both hot<ref name="PreCoolingCotter2001"/><ref name="PreCoolingKay2010"/><ref name="PreCoolingDuffield2007"/><ref name="PreCoolingBooth1997"/><ref name="PreCoolingKay1999"/> and moderate<ref name="PreCoolingLee1995"/><ref name="PreCoolingHessemer1984"/><ref name="PreCoolingSchmidt1981"/>(18,24c) conditions. This pre-calling does not appear to change muscle metabolism, so it is probably just offsetting the natural rise in temperature<ref name="PreCoolingBooth"/>. Pre-cooling does not appear to help with Sprint performance<ref name="PreCoolingDuffield2007"/><ref name="PreCoolingSleivert2000"/><ref name="PreCoolingDuffield2003"/>, and the benefits may be limited to 30-40 minutes of endurance exercise<ref name="PreCoolingNarubi2001"/>. There is some evidence that pre-cooling the working muscles and torso could impair performance compared with pre-cooling just the torso<ref name="PreCoolingSleivert2000"/>.
=How to pre-cool=
For most of us it's impractical to have an ice bath before training or competition. Even if it were practical, the chilling of the leg muscles may be unwise. Using an ice jacket is one approach used in several of the studies, but a simpler approach is to use a [[Jimbo Bandana]] before exercise to chill the torso.
=See Also=
* [[Running in the Heat]]
* [[Warmup]]
* [[Cooldown]]
=References=
<references>
<ref name="PreCoolingDuffield2003">Effect of wearing an ice cooling jacket on repeat sprint performance in warm/humid conditions http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1724622/ </ref>
<ref name="PreCoolingNarubi2001">Methods, advantages, and limitations of body cooling for exercise performance -- Marino 36 (2): 89 -- British Journal of Sports Medicine http://bjsm.bmj.com/content/36/2/89.short </ref>
<ref name="PreCoolingKay1999">Whole-body pre-cooling and heat storage during ... [J Sports Sci. 1999] - PubMed - NCBI http://www.ncbi.nlm.nih.gov/pubmed/10622353?dopt=Abstract </ref>
<ref name="PreCoolingBooth1997">Improved running performance in hot hum... [Med Sci Sports Exerc. 1997] - PubMed - NCBI http://www.ncbi.nlm.nih.gov/pubmed/9243494?dopt=Abstract </ref>
<ref name="PreCoolingSchmidt1981">Effect of a precooling maneuver on body temperature and exercise performance http://jap.physiology.org/content/50/4/772.abstract?ijkey=a75e2fe6391bf7282e2486a2b3d597f19c1c652d&keytype2=tf_ipsecsha </ref>
<ref name="PreCoolingHessemer1984">Effect of slightly lowered body temperatures on endurance performance in humans http://jap.physiology.org/content/57/6/1731.abstract?ijkey=1cc0ed2074d3b0ffa29fd306524220b2d9a02e4d&keytype2=tf_ipsecsha </ref>
<ref name="PreCoolingSleivert2000">ScienceDirect.com - Comparative Biochemistry and Physiology - Part A: Molecular & Integrative Physiology - The influence of whole-body vs. torso pre-cooling on physiological strain and performance of high-intensity exercise in the heat http://www.sciencedirect.com/science/article/pii/S1095643301002720 </ref>
<ref name="PreCoolingLee1995">Exercise duration and thermoregulatory responses after whole body precooling http://jap.physiology.org/content/79/6/1971.short </ref>
<ref name="PreCoolingKay2010">Taylor & Francis Online :: Whole-body pre-cooling and heat storage during self-paced cycling performance in warm humid conditions - Journal of Sports Sciences - Volume 17, Issue 12 http://www.tandfonline.com/doi/abs/10.1080/026404199365326 </ref>
<ref name="PreCoolingBooth">European Journal of Applied Physiology, Volume 84, Number 6 - SpringerLink http://www.springerlink.com/content/f64vr5t791hhvaja/ </ref>
<ref name="PreCoolingCotter2001"> http://www.sciencedirect.com/science/article/pii/S1095643301002732 </ref>
<ref name="PreCoolingDuffield2007">European Journal of Applied Physiology, Volume 100, Number 6 - SpringerLink http://www.springerlink.com/content/a4mw76508g053742/ </ref>
</references>
Exercise produces not only movement, but also heat, and this heat can be a limiting factor in performance. A number of studies have shown the cooling the body to slightly lower than normal temperatures can improve performance in both hot<ref name="PreCoolingCotter2001"/><ref name="PreCoolingKay2010"/><ref name="PreCoolingDuffield2007"/><ref name="PreCoolingBooth1997"/><ref name="PreCoolingKay1999"/> and moderate<ref name="PreCoolingLee1995"/><ref name="PreCoolingHessemer1984"/><ref name="PreCoolingSchmidt1981"/>(18,24c) conditions. This pre-calling does not appear to change muscle metabolism, so it is probably just offsetting the natural rise in temperature<ref name="PreCoolingBooth"/>. Pre-cooling does not appear to help with Sprint performance<ref name="PreCoolingDuffield2007"/><ref name="PreCoolingSleivert2000"/><ref name="PreCoolingDuffield2003"/>, and the benefits may be limited to 30-40 minutes of endurance exercise<ref name="PreCoolingNarubi2001"/>. There is some evidence that pre-cooling the working muscles and torso could impair performance compared with pre-cooling just the torso<ref name="PreCoolingSleivert2000"/>.
=How to pre-cool=
For most of us it's impractical to have an ice bath before training or competition. Even if it were practical, the chilling of the leg muscles may be unwise. Using an ice jacket is one approach used in several of the studies, but a simpler approach is to use a [[Jimbo Bandana]] before exercise to chill the torso.
=See Also=
* [[Running in the Heat]]
* [[Warmup]]
* [[Cooldown]]
=References=
<references>
<ref name="PreCoolingDuffield2003">Effect of wearing an ice cooling jacket on repeat sprint performance in warm/humid conditions http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1724622/ </ref>
<ref name="PreCoolingNarubi2001">Methods, advantages, and limitations of body cooling for exercise performance -- Marino 36 (2): 89 -- British Journal of Sports Medicine http://bjsm.bmj.com/content/36/2/89.short </ref>
<ref name="PreCoolingKay1999">Whole-body pre-cooling and heat storage during ... [J Sports Sci. 1999] - PubMed - NCBI http://www.ncbi.nlm.nih.gov/pubmed/10622353?dopt=Abstract </ref>
<ref name="PreCoolingBooth1997">Improved running performance in hot hum... [Med Sci Sports Exerc. 1997] - PubMed - NCBI http://www.ncbi.nlm.nih.gov/pubmed/9243494?dopt=Abstract </ref>
<ref name="PreCoolingSchmidt1981">Effect of a precooling maneuver on body temperature and exercise performance http://jap.physiology.org/content/50/4/772.abstract?ijkey=a75e2fe6391bf7282e2486a2b3d597f19c1c652d&keytype2=tf_ipsecsha </ref>
<ref name="PreCoolingHessemer1984">Effect of slightly lowered body temperatures on endurance performance in humans http://jap.physiology.org/content/57/6/1731.abstract?ijkey=1cc0ed2074d3b0ffa29fd306524220b2d9a02e4d&keytype2=tf_ipsecsha </ref>
<ref name="PreCoolingSleivert2000">ScienceDirect.com - Comparative Biochemistry and Physiology - Part A: Molecular & Integrative Physiology - The influence of whole-body vs. torso pre-cooling on physiological strain and performance of high-intensity exercise in the heat http://www.sciencedirect.com/science/article/pii/S1095643301002720 </ref>
<ref name="PreCoolingLee1995">Exercise duration and thermoregulatory responses after whole body precooling http://jap.physiology.org/content/79/6/1971.short </ref>
<ref name="PreCoolingKay2010">Taylor & Francis Online :: Whole-body pre-cooling and heat storage during self-paced cycling performance in warm humid conditions - Journal of Sports Sciences - Volume 17, Issue 12 http://www.tandfonline.com/doi/abs/10.1080/026404199365326 </ref>
<ref name="PreCoolingBooth">European Journal of Applied Physiology, Volume 84, Number 6 - SpringerLink http://www.springerlink.com/content/f64vr5t791hhvaja/ </ref>
<ref name="PreCoolingCotter2001"> http://www.sciencedirect.com/science/article/pii/S1095643301002732 </ref>
<ref name="PreCoolingDuffield2007">European Journal of Applied Physiology, Volume 100, Number 6 - SpringerLink http://www.springerlink.com/content/a4mw76508g053742/ </ref>
</references>