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 July 26, 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 July 26, 2014).

Share This




More Health & Medicine News

Saturday, July 26, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Beatings and Addiction: Pakistan Drug 'clinic' Tortures Patients

Beatings and Addiction: Pakistan Drug 'clinic' Tortures Patients

AFP (July 24, 2014) A so-called drugs rehab 'clinic' is closed down in Pakistan after police find scores of ‘patients’ chained up alleging serial abuse. Duration 03:05 Video provided by AFP
Powered by NewsLook.com
Too Few Teens Receiving HPV Vaccination, CDC Says

Too Few Teens Receiving HPV Vaccination, CDC Says

Newsy (July 24, 2014) The Centers for Disease Control and Prevention is blaming doctors for the low number of children being vaccinated for HPV. Video provided by Newsy
Powered by NewsLook.com
New Painkiller Designed To Discourage Abuse: Will It Work?

New Painkiller Designed To Discourage Abuse: Will It Work?

Newsy (July 24, 2014) The FDA approved Targiniq ER on Wednesday, a painkiller designed to keep users from abusing it. Like any new medication, however, it has doubters. Video provided by Newsy
Powered by NewsLook.com
Doctor At Forefront Of Fighting Ebola Outbreak Gets Ebola

Doctor At Forefront Of Fighting Ebola Outbreak Gets Ebola

Newsy (July 24, 2014) Sheik Umar Khan has treated many of the people infected in the Ebola outbreak, and now he's become one of them. 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