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 By: Christopher Mohr When hitting the iron, many folks consider only the movement or exercises they're doing, with no regard to the speed of contraction, eccentric portion of the movement, or time under tension.
This week I'm going to discuss eccentric muscle actions and the importance to an overall lifting regimen. First, here are the three phases of lifting:
Out of these three phases, the muscle can produce the most force during the eccentric phase, followed by isometric, and finally concentric. Therefore, to neglect the eccentric phase of lifting makes as much sense living off fast food if you want to get ripped.
Here's how it works: Micro-trauma occurs during the lengthening of the muscle while it is contracting to maintain control. This cellular damage, in turn, stimulates the release of local growth factors and revs up the anabolic machinery to build muscle. In fact, a muscle is approximately 40% stronger during the lowering of a weight as compared to lifting it. This observation led to the use of heavy negatives, sometimes relying entirely on spotters to lift the weight while the trainee was responsible for solely the lowering.
The alleged superiority of pure negatives remains largely theoretical; however, to reap the benefits of negatives without relying on spotters and supramaximal weights, simply control the eccentric component of the lift.
I am currently training with a split routine where I'm doing one body part per day. This morning happened to be chest day and there was a man next to me who actually believed his chest was a spring board; if he lowered the weight any faster and bounced it off his chest any harder, I thought he was going to crack some ribs. The best part was that he had very little weight on there, so it wasn't like he needed to make his chest into a trampoline. This may be familiar for many of you (and sorry if the person who was next to me is reading this). The moral of the story: control the weight and don't make your chest into a trampoline.
Let's take a look at a very recent study on this very topic before delving into some specific techniques to help take your growth to the next level.
Journal Of Strength & Conditioning Research,
2005, 19(4), 888-892 
The purpose of this study was to examine the effect of eccentric strength testing on delayed-onset muscle pain. You are all familiar with the soreness 24-72 hours (and up to 10 days in the research literature) post-workout; well if you've ever done negatives, you surely are familiar with this and will soon find out after adopting some of the techniques below.
The researchers hypothesized that eccentric strength testing alone would produce delayed-onset muscle pain and that prior eccentric training would protect against this pain.
Twenty college age students participated in this study with a mean age of 19 years. These students were novice trainees, meaning they had not participated in resistance training programs for at least 6 months.
Six to 10 submaximal repetitions were initially completed to familiarize the trainees with the protocol. Initially, eccentric strength testing (5 rep max) was performed on each arm. Next, 1 arm completed 3 sets of 10 eccentric reps to induce delayed-onset muscle pain.
In the next session, the arm that only did the initial 5 reps then added the 3 sets of 10 eccentric reps. This technique is used to ensure there is nothing unique about one arm or the other (maybe an injury or other factor that could positively or negatively influence results). The exercise utilized was a biceps curl type movement with the muscles used being referred to as the elbow flexors, since that's a primary function. A particular pain scale was used to determine pain in the elbow flexors.
What is interesting is that the researchers found that the delayed-onset muscle soreness was less in the arm that completed 2 strength tests vs. those that did just one strength test. So in a way, the additional sets were somewhat protective against future pain. Keep in mind, though, that even those who did just the 1 set were sore, meaning eccentric contractions can alone cause muscle damage thereby effecting future workouts. Also, the fact that more eccentric sets were protective shouldn't give you the green light to solely rely on these; you will quickly head down "overtraining boulevard" very quickly!
Here are some take-home points. The top 9 reasons you should include negatives:
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