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6 months, 1 week ago on 8 Effective Strength Training Techniques to Try Now
The eccentric and concenric are the terms used in anatomy and physiology and they are correct terms. If you take biceps as an example - when you flex bicep - it is concentric contraction and when the bicep is being "relaxed" or performs action opposite to flexion, but under the same load, it is eccentric contraction. It is said that eccentric contractions require more energy and generate more muscle growth. So, the terminology is correct indeed. You can find more detailed explanation in physiology and anatomy textbooks.
The "findings"from Syracuse university research are at least 30-40 years old. That's how long the Russian athletes (gymnasts and strength trainers) have been using these techniques at the top level. If you go to DragonDoo.com and and read books by Pavel Tsatsouline you will find references to this technique being used in the Soviet Union many moons ago... back when internet did not even exist... Research, huh?