Since the esteemed author sometimes pokes his head in here:
http://www.ncbi.nlm.nih.gov/entrez/...t_uids=9277388&query_hl=8&itool=pubmed_docsum
"Because epinephrine levels rose only slightly, it appears that either neurally released norepinephrine or some other, as yet unidentified, factor is responsible for stimulating glucose Ra during intense but submaximal exercise."
It's an interesting question to raise. I'm curious whether you think significant progress on this mystery has been made in the intervening 9 years. I'm especially curious about the "myokine" interleukin-6, which appears to be a candidate for the "as yet unidentified factor" your experiment predicts.
http://www.ncbi.nlm.nih.gov/entrez/...t_uids=9277388&query_hl=8&itool=pubmed_docsum
"Because epinephrine levels rose only slightly, it appears that either neurally released norepinephrine or some other, as yet unidentified, factor is responsible for stimulating glucose Ra during intense but submaximal exercise."
It's an interesting question to raise. I'm curious whether you think significant progress on this mystery has been made in the intervening 9 years. I'm especially curious about the "myokine" interleukin-6, which appears to be a candidate for the "as yet unidentified factor" your experiment predicts.