Navigation Links
Human Growth Hormone Does Boost Athletic Performance
Date:5/3/2010

In trial, those who took the banned substance were leaner and ran faster,,

MONDAY, May 3 (HealthDay News) -- Human growth hormone, a substance frequently implicated in sports doping scandals, does seem to boost athletic performance, a new study shows.

Australian researchers gave 96 non-professional athletes aged 18 to 40 injections of either HGH or a saline placebo. Participants included 63 men and 33 women. About half of the male participants also received a second injection of testosterone or placebo.

After eight weeks, men and women given HGH injections sprinted faster on a bicycle and had reduced fat mass and more lean body mass. Adding in testosterone boosted those effects -- in men also given testosterone, the impact on sprinting ability was nearly doubled.

HGH, however, had no effect on jumping ability, aerobic capacity or strength, measured by the ability to dead-lift a weight, nor did HGH increase muscle mass.

"This paper adds to the scientific evidence that HGH can be performance enhancing, and from our perspective at WADA [World Anti-Doping Agency], lends support to bans on HGH," said Olivier Rabin, WADA's science director.

The study, which was funded in part by WADA, is in the May 4 issue of the Annals of Internal Medicine.

Human growth hormone is among the substances banned by the WADA for use by competitive athletes. HGH is also banned by Major League Baseball, though the league doesn't currently test for it.

HGH has made headlines in the sports world. Recently, American tennis player Wayne Odesnik accepted a voluntary suspension for importing the substance into Australia, while Tiger Woods denied using it after the assistant to a prominent sports medicine expert who had treated Woods was arrested at the U.S.-Canada border with HGH.

However, based on anecdotal reports and athlete testimonies, HGH is widely abused in professional sports, said Mark Frankel, director of the scientific freedom, responsibility and law program for the American Association for the Advancement of Science.

Prior research has suggested HGH reduces fat mass, Rabin said, as well as help the body recover more quickly from injury or "microtraumas" -- small injuries to the muscles, bones or joints that occur as a result of intense training. That type of a boost could put athletes at a competitive advantage, Rabin said.

But research as to whether HGH is actually performance-enhancing -- that is, making athletes stronger or faster -- has been limited, according to the research ream, led by Dr. Ken Ho, of the department of endocrinology at St. Vincent's Hospital, Sydney.

In the study, Ho's team found that the improvement in sprinting speed for athletes on HGH was the equivalent of a 4 percent gain. In runner's terms, that means an athlete who typically runs the 100-meter dash in 10 seconds could shave off a bit less than half a second of time. Or, in swimmer's terms, it's the equivalent of shaving off 1.2 seconds from a 50-meter swim normally done in about 30 seconds.

"For athletes, it is sufficient to make a very significant difference in terms of winning or losing a competition," Rabin said. "It's the difference between being the winner and the last one in the finals."

Sprint capacity returned to normal six weeks after participants stopped receiving injections, according to the study.

Yet the study has limitations, Frankel said. Researchers could not say with certainty whether the athletes improved sprint ability because of HGH or because they trained harder during the 8 weeks of the study. And many athletes take HGH believing it will boost endurance, strength, power and other physical abilities -- effects the study did not find.

"Athletes may be taking HGH as a means of trying to improve their performance, even though there is some concern about whether it really does that," Frankel said. "If it does, and that is a big 'if,' it is certainly in the class of enhancement drugs that change the playing field."

Among the reasons WADA bans HGH are health concerns. In the study, athletes who received HGH were more likely to complain of swelling and joint paint more than those who received the placebo. Side effects could be more severe at the higher doses probably taken illicitly, researchers said.

Currently, blood tests are used to detect excess HGH circulating in the body that can indicate an athlete is taking it, Rabin said.

More information

The World Anti-Doping Agency has more on the issue.



SOURCES: Olivier Rabin, Ph.D., science director, World Anti-Doping Agency, Montreal; Mark Frankel, Ph.D., director, scientific freedom, responsibility and law program, American Association for the Advancement of Science, Washington, D.C.; Annals of Internal Medicine, May 4, 2010.


'/>"/>
Copyright©2010 ScoutNews,LLC.
All rights reserved

Related medicine news :

1. Magnetic field measurements of the human heart at room temperature
2. UCSF Researchers Identify Regulator of Human Sperm Cells
3. Adventurer Sets Sea Trial for World Record Human-Powered Ocean Crossing from Canada to Hawaii
4. PeopleStreme Human Capital Releases 'New Trends in Performance Management - 2010' Whitepaper
5. UNFPA Honoured With Human Rights Award
6. Human Rights Denied: Obama Leaves 75 Million Children Behind
7. OnlineEducation.com Announces Expansion of Liberal Arts & Humanities to its Accredited Online Degree Programs
8. Obama Proposes $911 Billion for Health and Human Services
9. Human Touch Introduces New CirQlation™ Elite Foot & Calf Massager Providing Ultimate Targeted Relief for Tired Feet and Calves
10. Human Touch Unveils HT-Connect™, the First Personalized Wellness Solution Wirelessly Connecting Human Touch Massage Chairs with iPhone and iPod Touch
11. Israel Flying Aid Humanitarian Volunteers Confront Children Suffering In Haiti
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:2/5/2016)... ... February 05, 2016 , ... Give To Cure ... to search for and donate to Give To Cure’s campaign that is crowdfunding clinical ... lets users make and share payments through a smart device. In 2015 alone, Venmo ...
(Date:2/5/2016)... New York (PRWEB) , ... February 05, 2016 , ... ... the election of Patrick McDermott as Chairman of the National Board of Directors. Mr. ... as Chairman of the Board,” stated Leslie A. Chambers , APDA President and ...
(Date:2/5/2016)... San Francisco, CA (PRWEB) , ... February 05, ... ... dentist and founder of CitiDent, announces that it is now welcoming ... by Dr. Cheng, CitiDent offers a complete range of oral health care, including ...
(Date:2/5/2016)... ... 2016 , ... Health and wellness is a topic that should concern all ... are experiencing an illness. Migraines are a severe form of a headache and often ... not wish the pain on their worst enemy, the feeling can last for many ...
(Date:2/5/2016)... ... , ... Calls Blacklist has just been updated by mobile app developer Vlad ... has fixed known bugs within the app. Calls Blacklist allows its users to only ... any of their device’s battery power or memory. It provides a powerful call blocker ...
Breaking Medicine News(10 mins):
(Date:2/5/2016)... LOS ANGELES , Feb. 5, 2016  Redwood ... of a new product designed to help women balance ... oral strip delivery technology. Jason Cardiff ... company will be able to help the millions of ... suffer from the effects of imbalanced hormones. Our research ...
(Date:2/5/2016)... 2016  As people age, it is natural to ... screenings and tests that are linked with certain age ... the majority of aging individuals, hearing health is too ... 37.5 million American adults who report some trouble hearing, ... hearing health a 2016 healthy aging priority.[1] ...
(Date:2/5/2016)... DUBLIN , Feb. 5, 2016 /PRNewswire/ ... announced the addition of the "Global ... financials" company profile to their offering. ... announced the addition of the "Global ... financials" company profile to their offering. ...
Breaking Medicine Technology: