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* If you are shivering and cannot stop even if you try, you have moderate hypothermia (core 91 - 95). Coordination is likely to be obviously impaired and your skin is likely to be pale, possibly with blue lips, ears and fingers. This is a dangerous condition; you need to get warm and dry urgently.
* If the shivering comes in waves, this is probably severe hypothermia. Other symptoms include difficulty speaking, very poor coordination and inability to use the hands. Collapse is likely at this stage and the victim may appear to be dead. (If you pull the victims arm away from their body and it curls back up, they are still alive.)
* There is some evidence that hypothermia may increase the oxygen consumption for a given exercise load<ref name="Campbell-1991"/>, as well as dramatically reduce muscular endurance<ref name="SustCold"/>, muscular force<ref name="Sargeant1987"/>, and muscular power<ref name="Sargeant1987"/>.
==Prevention==
To avoid hypothermia it is important to be able to adjust your clothing to stay warm.
==See also==
* [[Running in the Cold]]
==References==
<references>
<ref name="Campbell-1991">AP. Campbell, BD. Sykes, Effects of internal motions on the development of the two-dimensional transferred nuclear Overhauser effect., J Biomol NMR, volume 1, issue 4, pages 391-402, Nov 1991, PMID [http://www.ncbi.nlm.nih.gov/pubmed/1841707 1841707]</ref>
<ref name="SustCold">The duration of sustained contractions of the human forearm at different muscle temperatures http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1356726/ </ref>
<ref name="Sargeant1987">Anthony J. Sargeant, Effect of muscle temperature on leg extension force and short-term power output in humans, European Journal of Applied Physiology and Occupational Physiology, volume 56, issue 6, 1987, pages 693–698, ISSN [http://www.worldcat.org/issn/0301-5548 0301-5548], doi [http://dx.doi.org/10.1007/BF00424812 10.1007/BF00424812]</ref>
</references>