Men who think they are getting growth hormone score higher in power jump
Here’s more proof that it’s all in your head.
receive an inert shot that might or might not be growth hormone are more likely
than women to believe it’s the real thing, a new study finds. What’s more, men
who got fake shots actually scored higher on a jumping test than they did in
previous tests, researchers from
Ken Ho, an
endocrinologist at the Garvan Institute of Medical Research and at the
At the end of the study, among people receiving placebos, 81 percent of men but only 31 percent of women believed they were getting the real thing. Also, those men scored significantly higher on a jump height test than they had before getting the fake shots.
to fill out a questionnaire, men who had gotten a placebo but thought it was
real growth hormone were also likely to assess their own scores as improved. Ho
presented the findings June 17 in
“It’s clear in our study that the mind plays amazing tricks,” Ho says. “I just wonder whether a lot of the achievements in sports are likely to be due to the power of the mind rather than substances that have been dished out to athletes.”
It also says something about the male mind, he says. “When we started recruiting for this study, we easily filled the slots for men. It was very difficult to fill the slots for women,” he says. “I think women are very protective of their bodies.”
The study team is still evaluating the participants who received real growth hormone to see whether they benefited.
hormone has legitimate uses in certain groups — elderly people, patients with
HIV and people who have a natural growth hormone deficiency. But no legitimate
study has shown it helps young athletes in the prime of life, says Richard Auchus,
a steroid biochemist at the University of Texas Southwestern Medical Center, in
On the other hand, placebos have shown effects in study after study, he says.The placebo effect is real in this and other research, Auchus says. But growth hormones are unlikely to have a large effect on sports performance above the placebo, he says. Auchus adds one caveat: Some body builders and other strength-focused athletes might use doses of growth hormone far in excess of the safe amounts used in this study. Whether that would result in better performance isn’t clear, he says, but it would certainly increase the risk of side effects.
Hansen, J.L. . . . and K.K. Ho. 2008. The power of the mind: An evaluation of the placebo effect in a study of GH on physical performance. Endocrine Society annual meeting. June 15-18. San Francisco.