Featured Research

from universities, journals, and other organizations

Human growth hormone significantly increases sprint capacity in healthy recreational athletes

Date:
May 4, 2010
Source:
American College of Physicians
Summary:
A new study finds that human growth hormone (HGH) improves sprint capacity in healthy recreational athletes. This is the first trial to demonstrate that HGH improves athletic performance.

A study released in Annals of Internal Medicine, the flagship journal of the American College of Physicians (ACP), finds that human growth hormone (HGH) improves sprint capacity in healthy recreational athletes. This is the first trial to demonstrate that HGH improves athletic performance.

During the eight-week study, 96 recreationally-trained athletes ages 18 to 40 (63 men and 33 women) were randomly assigned to receive either an inactive placebo or HGH injections. At the same time, half of the male participants were also randomly assigned to receive an additional injection of placebo or testosterone. Participants, investigators, and those who measured outcomes and analyzed data were blinded to interventions.

At eight weeks, the researchers found that HGH injections increased the athletes' ability to sprint on a bicycle but had no effects on fitness or their ability to pull a weight or jump. The effect on sprint capacity was nearly doubled in men who also received testosterone injections.

"We found the enhancement in sprint capacity would correlate to a 0.4 second improvement over 10 seconds in a 100-meter dash." said Dr. Ken Ho, Head of the Department of Endocrinology at St. Vincent's Hospital in Sydney, and lead author of the study. "This improvement could turn the last place finisher in the Olympic finals into a gold medal winner."

In addition to improvements in sprint capacity, researchers found that HGH significantly reduced fat mass among the athletes, but did not increase muscle mass. Sprint capacity returned to normal six weeks after participants stopped receiving injections. Athletes who received HGH complained of swelling and joint pain more than those who received placebo.

"In our study, we used doses of growth hormone on the low end of what is believed to be abuse in sports," said Dr. Ho. "And for that reason, we think that the real effects of growth hormone could be far greater than what's reported in our study. Equally, the side effects could be much more serious, as well."


Story Source:

The above story is based on materials provided by American College of Physicians. Note: Materials may be edited for content and length.


Journal Reference:

  1. Udo Meinhardt, Anne E. Nelson, Jennifer L. Hansen, Vita Birzniece, David Clifford, Kin-Chuen Leung, Kenneth Graham, Ken K.Y. Ho. The Effects of Growth Hormone on Body Composition and Physical Performance in Recreational Athletes: A Randomized Trial. Annals of Internal Medicine, 2010; 152 (9): 568-577 [link]

Cite This Page:

American College of Physicians. "Human growth hormone significantly increases sprint capacity in healthy recreational athletes." ScienceDaily. ScienceDaily, 4 May 2010. <www.sciencedaily.com/releases/2010/05/100503174016.htm>.
American College of Physicians. (2010, May 4). Human growth hormone significantly increases sprint capacity in healthy recreational athletes. ScienceDaily. Retrieved September 16, 2014 from www.sciencedaily.com/releases/2010/05/100503174016.htm
American College of Physicians. "Human growth hormone significantly increases sprint capacity in healthy recreational athletes." ScienceDaily. www.sciencedaily.com/releases/2010/05/100503174016.htm (accessed September 16, 2014).

Share This



More Health & Medicine News

Tuesday, September 16, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

President To Send 3,000 Military Personnel To Fight Ebola

President To Send 3,000 Military Personnel To Fight Ebola

Newsy (Sep. 16, 2014) President Obama is expected to send 3,000 troops to West Africa as part of the effort to contain Ebola's spread. Video provided by Newsy
Powered by NewsLook.com
Man Floats for 31 Hours in Gulf Waters

Man Floats for 31 Hours in Gulf Waters

AP (Sep. 16, 2014) A Texas man is lucky to be alive after he and three others floated for more than a day in the Gulf of Mexico when their boat sank during a fishing trip. (Sept. 16) Video provided by AP
Powered by NewsLook.com
EU Ministers and Experts Meet to Discuss Ebola Reponse

EU Ministers and Experts Meet to Discuss Ebola Reponse

AFP (Sep. 15, 2014) The European Commission met on Monday to coordinate aid that the EU can offer to African countries affected by the Ebola outbreak. Duration: 00:58 Video provided by AFP
Powered by NewsLook.com
Despite The Risks, Antibiotics Still Overprescribed For Kids

Despite The Risks, Antibiotics Still Overprescribed For Kids

Newsy (Sep. 15, 2014) A new study finds children are prescribed antibiotics twice as often as is necessary. Video provided by Newsy
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

    Environment News

      Technology News



      Save/Print:
      Share:

      Free Subscriptions


      Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

      Get Social & Mobile


      Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

      Have Feedback?


      Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
      Mobile: iPhone Android Web
      Follow: Facebook Twitter Google+
      Subscribe: RSS Feeds Email Newsletters
      Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins