Definition: "An ergogenic aid is any substance or phenomenon that enhances performance "
The training principle that increases strength athletes' growth hormone secretions by a factor 17
Resistance training where you take three seconds to do the return – or in sports scientists' jargon: eccentric – movement results in a drastically higher growth hormone secretion than when the return movement is done in less than a second. Brazilian sports scientists write about it in Biology of Sport.
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But the effects of all these interventions are limited. They may be of interest to athletes who want to delay the aging process, but are probably too modest to boost muscle building.
Brazilian sports scientists, at the Methodist University of Piracicaba, discovered a way of increasing post-resistance workout growth hormone secretion by an amazing factor 17. This is more likely to have a positive effect on muscle growth...
The men in one group took half a second to do the return movement [fast eccentric velocity; FEV]; the men in the other group took three seconds to do the same [slow eccentric velocity; SEV].
Fifteen minutes after the workout, the growth-hormone concentration was a whopping 17 times higher in the blood of the men in the slow eccentric velocity group than in the men in the fast eccentric velocity group.
"Muscular adaptations result from a multifactorial process involving mechanical, metabolic, and immune/inflammatory factors in addition to various hormonal responses. Therefore, if the emphasis in resistance training periodization is to induce a greater acute metabolic stress and growth hormone response, we recommend manipulating the eccentric movement velocity."