Question: 8.14 Testosterone for older men. As men age, their testosterone levels gradually decrease. This may cause a reduction in lean body mass, an increase in

8.14 Testosterone for older men. As men age, their testosterone levels gradually decrease.

This may cause a reduction in lean body mass, an increase in fat, and other unde sirable changes. Do testosterone supplements reverse some of these effects? A study in the Netherlands assigned 237 men aged 60 to 80 with low or low-normal testos terone levels to either a testosterone supplement or a placebo. The report in the Jour nal of the American Medical Association described the study as a "double-blind, random ized, placebo-controlled trial."' Explain each of these terms to someone who knows no statistics.

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