What Increases Intramuscular Tension
In every concentric contraction (overcoming or lifting a load), lifting a certain weight with more acceleration will always produce a greater degree of intramuscular tension. In an eccentric contraction (yielding or lowering a resistance) it’s the opposite; the less acceleration you allow, the more intramuscular tension there will be. Why the difference? Well, to lift a load faster you must produce more force. But to lower it faster requires you not to exert more force, but less (letting the bar go down doesn’t require any force). During an eccentric contraction you need a greater force output to bring the bar down slowly, hence the increased tension. So what does that give us concretely?