Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Growth hormone is a poor doping agent for athletes

19.09.2007
Anyone who injects growth hormone with the intention of gaining muscle mass and improving performance should think again. The hormone improves neither muscle mass nor physical performance. This is shown in a new dissertation from the Sahlgrenska Academy at Göteborg University in Sweden.

Doping in sport using growth hormone has become more frequent since the middle of the 1980s. The substance does not cause the same aggressive behaviour as anabolic steroids cause, but it can cause problems that include damage to the heart and blood vessels.

"Many of those who abuse anabolic steroids regard growth hormone as the Rolls Royce of doping agents: it is significantly more expensive to use than anabolic steroids. There is, however, no scientific evidence that it increases performance when used alone as a doping agent", says Dr. Christer Ehrnborg.

Christer Ehrnborg has studied 30 well-trained people living in Göteborg. Twenty of these injected large doses of growth hormone each day for a month, while the other 10 believed that they also were receiving growth hormone but received injections of harmless saline solution instead. Tests of the participants' physical performance on an exercise cycle showed that the participants receiving growth hormone did not perform better than those receiving saline solution.

... more about:
»Christer »Ehrnborg »inject

"It has been a matter of controversy whether growth hormone actually causes an effect or whether it is a matter involving mass psychology. Both our study and studies carried out by others suggest that taking growth hormone will not make you a better athlete", says Christer Ehrnborg.

Measurement of the body compositions of the participants showed that injecting growth hormone reduced the fraction of body fat and increased the amount of water in the body.

"Athletes who inject growth hormone immediately notice an effect in the body, and they assume that the change must improve their performance. We cannot see, however, any effect of increased muscle mass from the hormone in our experiments", says Christer Ehrnborg.

Doping with growth hormone is difficult to prove, since natural levels can vary widely from one person to another, and from one occasion to another in the same person. Christer Ehrnborg presents results in a second article in which elite athletes were studied for a full year in order to determine which factors affect the natural variation in growth hormone levels.

"We found several interesting biomarkers that can be used when analysing blood samples. A new doping test is in the process of being launched, based partially on our research results. The method must first be validated to show that it can be used in judicial proceedings", says Christer Ehrnborg.

For more information, contact:
Dr. Christer Ehrnborg, telephone: +46 31 741 1722, mobile: +46 70 649 6573, e-mail: christer.ehrnborg@gu.se
Supervisor:
Associate professor Thord Rosén, telephone: +46 31 342 7055, mobile: +46 70 266 4642, e-mail: thord.rosen@medic.gu.se
Thesis presented for the degree Medicine doktor at the Sahlgrenska Academy, Institute of Medicine, Department of Internal Medicine

Thesis title: Growth Hormone in Athletes

The thesis is defended.

Elin Lindström Claessen
Press secretary, The Sahlgrenska Academy at Göteborg University
Telephone: +46 31 786 3837, mobile: +46 70 829 4303
e-mail: elin.lindstrom@sahlgrenska.gu.se

Elin Lindström Claessen | idw
Further information:
http://www.vr.se

Further reports about: Christer Ehrnborg inject

More articles from Life Sciences:

nachricht Researchers develop eco-friendly, 4-in-1 catalyst
25.04.2017 | Brown University

nachricht Transfecting cells gently – the LZH presents a GNOME prototype at the Labvolution 2017
25.04.2017 | Laser Zentrum Hannover e.V.

All articles from Life Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Making lightweight construction suitable for series production

More and more automobile companies are focusing on body parts made of carbon fiber reinforced plastics (CFRP). However, manufacturing and repair costs must be further reduced in order to make CFRP more economical in use. Together with the Volkswagen AG and five other partners in the project HolQueSt 3D, the Laser Zentrum Hannover e.V. (LZH) has developed laser processes for the automatic trimming, drilling and repair of three-dimensional components.

Automated manufacturing processes are the basis for ultimately establishing the series production of CFRP components. In the project HolQueSt 3D, the LZH has...

Im Focus: Wonder material? Novel nanotube structure strengthens thin films for flexible electronics

Reflecting the structure of composites found in nature and the ancient world, researchers at the University of Illinois at Urbana-Champaign have synthesized thin carbon nanotube (CNT) textiles that exhibit both high electrical conductivity and a level of toughness that is about fifty times higher than copper films, currently used in electronics.

"The structural robustness of thin metal films has significant importance for the reliable operation of smart skin and flexible electronics including...

Im Focus: Deep inside Galaxy M87

The nearby, giant radio galaxy M87 hosts a supermassive black hole (BH) and is well-known for its bright jet dominating the spectrum over ten orders of magnitude in frequency. Due to its proximity, jet prominence, and the large black hole mass, M87 is the best laboratory for investigating the formation, acceleration, and collimation of relativistic jets. A research team led by Silke Britzen from the Max Planck Institute for Radio Astronomy in Bonn, Germany, has found strong indication for turbulent processes connecting the accretion disk and the jet of that galaxy providing insights into the longstanding problem of the origin of astrophysical jets.

Supermassive black holes form some of the most enigmatic phenomena in astrophysics. Their enormous energy output is supposed to be generated by the...

Im Focus: A Quantum Low Pass for Photons

Physicists in Garching observe novel quantum effect that limits the number of emitted photons.

The probability to find a certain number of photons inside a laser pulse usually corresponds to a classical distribution of independent events, the so-called...

Im Focus: Microprocessors based on a layer of just three atoms

Microprocessors based on atomically thin materials hold the promise of the evolution of traditional processors as well as new applications in the field of flexible electronics. Now, a TU Wien research team led by Thomas Müller has made a breakthrough in this field as part of an ongoing research project.

Two-dimensional materials, or 2D materials for short, are extremely versatile, although – or often more precisely because – they are made up of just one or a...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Expert meeting “Health Business Connect” will connect international medical technology companies

20.04.2017 | Event News

Wenn der Computer das Gehirn austrickst

18.04.2017 | Event News

7th International Conference on Crystalline Silicon Photovoltaics in Freiburg on April 3-5, 2017

03.04.2017 | Event News

 
Latest News

NASA's Fermi catches gamma-ray flashes from tropical storms

25.04.2017 | Physics and Astronomy

Researchers invent process to make sustainable rubber, plastics

25.04.2017 | Materials Sciences

Transfecting cells gently – the LZH presents a GNOME prototype at the Labvolution 2017

25.04.2017 | Life Sciences

VideoLinks
B2B-VideoLinks
More VideoLinks >>>