There is certainly controversy over the effectiveness of Kegal exercises in treatment of urinary incontinence and sexual benefits. Journal of American Medical Association published findings on behavioral vs drug treatment for urge incontinence which seems to support the effectiveness of behavior therapy (Kegals). Judge for yourself:
http://jama.ama-assn.org/cgi/content/full/280/23/1995
Proponents of biofeedback and exercise physiology assisted Kegal's site articles and research at:
http://www.incontinet.com/home.htm
One article called: The Bastardization Of Dr. Kegel's Exercises
strongly supports Biofeedback assisted Kegal exercise, citing Kegal's original study among other sources.
Your product was developed to meet the proposed need for biofeedback, and exercise physiology as a method for learning and performing Kegal exercises with optimal results. The Company claims support from this research. I have requested their published research data via email, but have not received a response yet, and could find no other independant research studies for the Kegalmaster specifically.
As a Nurse I would warn you to use proper cleaning and storage of your Kegalmaster. Contamination and infection is probably it's greatest risk. The cramping may be related to muscle strain or fatigue. If you take measures to protect yourself from infection the Kegalmaster could be approached as any exercise equiptment involving resistance to build muscle tone. (Moderation and proper use)
That is my interpretation of the studies I reviewed. Your personal experience combined with information through the links provided in your Answer should allow you to interpret the studies' results and make an informed choice.
Good luck to you. Please let me know if
If the JAMA article link will not open. I can forward it via email. I will also forward any response I receive from KM 2000.
I hope my information is helpful. If you have more questions, just ask! I will gladly help, otherwise please click "accept".
Positive feedback and any bonus would be appreciated. Thank you, Christy