Active Rewarming (Soaking in 40 to 42 C Water)

Efficacy of Active Rewarming as a Lifestyle Change According to GRADE* Ranking: 

Hypothermia [1, 2, 3]:

Recommendation: Weakly in favor (Exposure to warmer environments is beneficial to those with hypothermia.)

Grade of Evidence: Low level of evidence 

Frostbite [1, 2, 3]:

Recommendation: Strongly in favor (Exposure to warmer environments is beneficial to those with frostbite.)

Grade of Evidence: Moderate level of evidence 

Hallux Rigidus [4]:

Recommendation: Weakly in favor (Active rewarming may help reduce pain and stiffness in those with hallux rigidus.)

Grade of Evidence: Very low level of evidence 

* www.gradeworkinggroup.org 

References: 

1. http://dhss.alaska.gov/dph/Emergency/Documents/ems/documents/Alaska%20DHSS%20EMS%20Cold%20Injuries%20Guidelines%20June%202014.pdf

2. http://www.mayoclinic.org/first-aid/first-aid-frostbite/basics/art-20056653

3. http://www.dtic.mil/dtic/tr/fulltext/u2/a219560.pdf

4. http://www.aofas.org/footcaremd/conditions/ailments-of-the-big-toe/pages/hallux-rigidus.aspx