Earthquake Bar Bench Press: Shake Your Way to More Mass

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earthquake bar, infinite_labs
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Earthquake Bar Bench Press: Shake Your Way to More Mass

By: Robbie Durand

In recent years, there have been several accessories added to the weight room that can make the gym more enjoyable such as using bands and chains have been reported to result in greater increases in muscle strength.  Bands and chain training is a form of variable resistance exercise.  For example, the barbell squat, the weight of the bar stays the same throughout the lift.  Variable resistance such as bands and chains requires differing degrees of force to be applied to the target muscle to create constant resistance, compelling the muscle to work harder to meet the demands of the exercise. For example, with bands and chains, the force to require the bar to be lifted is much greater than standard resistance exercise as each chain is lifted off the floor or the band is stretched.

Squat Bands

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Chain Bench Press

A previous study found that replacing some of the free weight resistance with elastic band resistance during bench press training resulted in greater increases in strength over a 13-week training period compared to bench pressing with traditional fixed resistance. In a recent meta-analysis, when researchers examined the effects of a long-term (≥ seven weeks) variable resistance training program using chains or elastic bands, it was found that variable resistance training led to a significantly greater mean strength gain than the gain recorded in response to conventional weight training. So based on this meta-analysis of studies, if you are looking to increase your bench press or squat, be sure to incorporate band and chain training into your regimen.

Shake your Way to a Stronger Bench Press
The Earthquake Bar was specially designed to hold a significant amount of weight and can be set up in a multitude of ways with bands and weights. Instead of safety slots, it has two-inch grooves cut into the wood to channel and grip the bands as the Bar bends radically under super-heavy weight. If you have ever seen someone uses one of these bars, they tend to shake because of the instability of the bar.


It has been assumed that training with instability such as the earthquake bar and the bamboo bar results in higher activation of the stabilizing muscles and is more beneficial to sports performance.  One of the disadvantages of instability training is that you have to use a much lighter weight to stabilize your body.  Furthermore, many studies have shown that peak force output is lower when training on an unstable surface. For example performing a chest press on an unstable surface resulted in a 59.6% decrease in maximal isometric force production compared to the stable condition.  Little is known about the effects of the earthquake bar on muscle activation.

earthquake bar, infinite_labsResearchers hooked up electrodes all over subject’s chest and delts, arms, and traps and had them perform bench press either with a regular bench press or an Earthquake bar. Researchers had resistance-trained volunteers bench pressed 60% of their single repetition maximum bench press under the unstable condition and 75% of their 1-RM under the stable condition. At the end of the study, one would think that the muscle activation would be greater using the Earthquake bar, but the researchers did not find a difference in the muscle activation of the chest, but they did conclude that the EMG amplitudes (i.e. muscle activation) of the biceps and the middle deltoid were higher while using the Earthquake bar, compared to the stable bench press condition, despite the lower amount of weight used. There was no difference in respect of any other muscle group between stable and unstable conditions.

The great thing about the study was that the researchers reported that when using an Earthquake bar, the activation of the prime movers in the bench press was similar, while activation of some stabilizing muscles was greater in comparison with a stable load, even though the absolute weight was lower when using the unstable load.  In short, the lifters were using a lighter weight but getting the same muscle activation of the chest as using a heavier weight.  The Earthquake bar also took longer to press (increased duration of the concentric and eccentric phases) as compared to the stable load. An unbalanced load will also increase the time under tension, which may lead to different training effects.

Key Points: The Earthquake Bar was able to activate similar muscle activation despite using a lighter weight.  Using the Earthquake Bar can be a great way to add variety to your workout despite using a lower amount of weight.

Effect of an unstable load on primary and stabilizing muscles during the bench press, by Ostrowski, Carlson & Lawrence, in The Journal of Strength & Conditioning Research (2016)
Anderson KG and Behm DG. Maintenance of EMG activity and loss of force output with instability. J Strength Cond Res 18: 637-640, 2004.
Behm DG, Anderson K, and Curnew RS. Muscle force and activation under stable and unstable conditions. J Strength Cond Res 16: 416-422, 2002.
Dunnick DD, Brown LE, Coburn JW, Lynn SK, and Barillas SR. Bench Press Upper- Body Muscle Activation Between Stable and Unstable Loads. J Strength Cond Res 29: 3279-3283, 2015.
Lawrence M and Carlson L. Effects of an unstable load on force and muscle activation during a parallel back squat. Journal of Strength and Conditioning, 2015.

 

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