A single-isotope technique can accurately measure substrate cycling rates in skeletal muscle, demonstrating a 12-fold increase with isoprenaline.
Animal data support single-isotope accuracy for muscle substrate cycling; leaves open human translation.
The effects of several agents on the rates of the fructose 6-phosphate/fructose 1,6-bisphosphate substrate cycle were measured in incubated epitrochlearis muscles of the rat by monitoring the transfer of radiolabel from [6-14C]glucose to the 1-position of glucose residues in glycogen. The cycling rates observed were almost identical with those previously obtained by using the well-established dual-isotope technique. In particular, it was found that the beta-adrenoceptor agonist isoprenaline increased the cycling rate about 12-fold.
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Challiss et al. (1984) studied this question.
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