Glycerol - distance runner

[Optimass]

Am doing some work with a distance runner and thought I'd pose a question that may be some one can share some ideas on.

I have used a glycerol spike in pre-context for a body builder but not during carb cycling for a marathon athlete. We are experimenting at the moment.

Are there any athletes involved in cycling / triathlon or marathon that have used glycerol pre event to prolong hydration? Pts and Dieticians ... opinions and experiences welcome also.

This article discusses some good pros and cons - but I want actual practical experiences if possible.

http://www.pponline.co.uk/encyc/glycerol.html

Cheers O