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To the Editor: Dr Blackman and colleagues¹ found that addition of testosterone to GH administered to elderly men marginally increased their muscle strength and maximum oxygen uptake, compared with placebo or to GH alone, both of which did not provide benefit. I believe, however, that the authors underestimated the true diabetogenic effects of GH, because they compared the occurrence of diabetes and glucose intolerance against that for men who had received testosterone only. The appropriate comparison would have been the placebo group, in which there were half the number of cases as in the group receiving testosterone only. In addition, more than half of the men receiving GH developed abnormal glucose metabolism during the 26 weeks of this study. From the authors' description it is not clear whether the risk of these events increased over time, or whether most of them occurred soon after therapy was initiated. The latter would . . . [Full Text of this Article]

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