24-03-2008, 09:44 PM
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#1 (permalink)
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| UK-Muscle Moderator and NABBA Champion
Join Date: Jan 2005
Posts: 10,165
| GH study carried out on athletes
Here is a study that was at last carried out on athletes including bodybuilders to asses how GH effects performance... http://www.annals.org/cgi/content/fu...805200-00215v1
some key points are... Quote: |
Conclusion: Claims that growth hormone enhances physical performance are not supported by the scientific literature. Although the limited available evidence suggests that growth hormone increases lean body mass, it may not improve strength; in addition, it may worsen exercise capacity and increase adverse events. More research is needed to conclusively determine the effects of growth hormone on athletic performance.
| Quote: | Lean body mass increased significantly in growth hormone–treated groups compared with groups not treated with growth hormone (increase in lean body mass, 2.1 kg [95% CI, 1.3 to 2.9 kg]) (Table 3 and Appendix Figure 1, available at www.annals.org). The decrease in fat mass approached statistical significance (change in fat mass, –0.9 kg [CI, –1.8 to –0.0 kg]). Weight increased, although the difference was not statistically significant (change in weight, 0.3 kg [CI, –0.5 to 1.1 kg]).
| Quote: | Daily basal metabolic rate was higher in growth hormone–treated participants than in those not treated with growth hormone (daily basal metabolic rate, 141 kcal/24 hours [CI, 69 to 213 kcal/24 hours]) (Table 3 and Appendix Figure 3, available at www.annals.org). Resting respiratory exchange ratio or respiratory quotient was lower in growth hormone–treated participants (–0.02 [CI, –0.03 to –0.01]; mean, all participants, 0.78 [SD, 0.03]), reflecting the preferential use of lipids rather than carbohydrates for fuel at rest during growth hormone therapy. Resting heart rate was also significantly higher in growth hormone–treated participants (3.8 beats/min [CI, 0.2 to 7.4 beats/min]).
| although the study did also find that Strentgh was not improved.. Quote: |
Two studies evaluated change in strength (47, 70). These studies treated participants with growth hormone for 42 days (47) and 84 days (70), the longest treatment durations of all included studies. On 1-repetition maximum voluntary strength testing, growth hormone use did not improve biceps strength (change, –0.2 kg [CI, –1.5 to 1.1 kg]) or quadriceps strength (change, –0.1 kg [CI, –1.8 to 1.5 kg]) (Table 3 and Appendix Figure 2, available at www.annals.org). One study evaluated 7 other muscle groups for change in maximum strength and assessed 4 measures of change in muscle circumference (70)—none of these changes were significantly different between growth hormone–treated and non–growth hormone–treated groups.
| still the study is usefull for those considering GH use and what they might get from it...
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