Heat is commonly used "loosen" muscles, but what exactly is happening to relax the muscle? It wouldn't make sense that increased blood flow alone would relax muscle.
2 Answers
Read this it was very helpful to me as a Reiki Practitioner who wants to know how the heat generated by my hands on therapy with my patients for Hospice brings such relaxation to them.
http://healthyliving.azcentral.com/effects-temperature-muscular-contraction-11504.html
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$\begingroup$ Please add some more details to your answer. Your answer may become invalid if the link expires or gets broken. $\endgroup$ Jun 15, 2017 at 17:13
There may not be one because it may not have any effect.
It appears to be a placebo effect. There is not a lot of clinical evidence heat does anything beneficial, in fact cold may actually be more effective. Evidence of an effect appears to be mostly anecdotal or unscientific "studies".