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Top Five Reasons to Vary Tempo in Your Workout

Thursday, June 16, 2011 12:23 PM
1.    Vary Tempo to Overcome a Plateau
Varying tempo or changing the rate at which you perform the different parts of a lift is an excellent way to overcome a plateau and shock the body to adapt. Tempo or “time under tension” is a crucial element of resistance training that is commonly overlooked by coaches. Time under tension governs the amount of stimulus a muscle is exposed to. For instance, performing a set of 10 repetitions of squats with 60 kgs at a one-second-up and one-second-down tempo is quite different from the same weight and reps at a one-second-up and four- second-down tempo. The difference is in the time exposed to tension. The first variation takes 20 seconds, while the second variation takes 50 seconds. That is a 30 second difference in the time the muscles are exposed to the weight.

In prescribing tempo, four numbers are used like this: 4210. The first number dictates the seconds it takes for the eccentric or down motion, the second number is the pause before the concentric motion, which is the third number, and the fourth number is the pause before the repetition repeats. In the case of 4210 tempo in the bench press, it takes four seconds to lower the weight, there is a two second pause, then the weight is rapidly pushed up in one second and the rep starts over immediately.

You should change the amount of time spent on different phases of a lift because it increases intramuscular tension and provides a new or different type of stimulus to the muscles. It is a great way to further strength development once the body has adapted to a rep or set range and isn’t making progress. Plus, varied tempo is an ideal way to train for hypertrophy and strength at the same time.

2.    Train Different Energy Systems and Get More Adaptation
Not only should you vary tempo within a lift, but you should use different lifts that naturally have distinct speeds for optimal training results. Explosive ballistic contractions such as Olympic lifts bring about more central nervous system adaptations, while slow-speed lifting with varied eccentric and concentric time phases bring about more metabolic adaptations such as increases in muscle glycogen, creatine phosphate, and ATP. A combination of high- and low-velocity training produces greater strength and body composition results than each one alone.

Muscle adaptations are also facilitated with varied time under tension. One study found that increased time under tension resulted in greater muscle fatigue due to impairments in muscle contractile properties. By increasing neuromuscular fatigue through a variable tempo, researchers suggest that superior strength and hypertrophic gains can be made as long as the load lifted isn’t compromised.

3.    Target High-Threshold Motor Units with an Isometric Pause

High-threshold motor units are the fast-twitch or powerful muscle fibers. An excellent way to target them is with an isometric pause in the advantageous (where the body is strongest based on lever length) position. For flexion exercises, such as bicep or hamstring curls, you should pause in the down position for one to two seconds. For extension exercises such as squats or bench presses, pause in the up position in between the concentric and eccentric motions, when the limbs achieve near lockout position.

Of course, varying tempo allows you to perform an isometric pause in the disadvantageous position when you have poor leverage as well. The disadvantageous position for flexion exercises is the up position and for extension exercises it is the down position. You can imagine that holding the bottom position of a squat for one or two seconds would provide a valuable training stimulus while increasing intramuscular tension, which can further boost strength development.

Take note that it is necessary to train high-threshold motor units and develop maximal strength in slower lifts such as the squat, deadlift, and bench press in order to improve faster on movements such as Olympic lifts.  For example, you cannot power snatch 100 kgs unless you can squat about 184 kgs. If you can only back squat 160 kgs, you won’t be able to snatch 100kgs until you increase your squat weight significantly. Varying tempo is an ideal way to work on this.

4.    Recover Faster with a Varied Tempo
Research shows that it’s possible to increase your time under tension and perform a high volume of work by using two bouts of varied resistance speed. A recent study found that performing a slow-velocity exercise, about 4 seconds for the eccentric lowering phase of the biceps curl, followed by the same fast-velocity exercise (called the repeated bout group in this study) will reduce muscle damage and allow for a faster recovery than just performing the fast-velocity exercise (called the single bout group alone). The repeated bout group had less muscle soreness after the fast-velocity exercise and recovered isometric strength and range of motion significantly faster than the single bout group.

Less muscle damage and soreness can be beneficial if you need to recover quickly in preparation for competition or because you want to perform a subsequent workout that is more demanding and yields increased soreness. This study illustrates both the value and effect of varying tempo: different tempos will require the body to adapt in different ways and cause unique metabolic and neuromuscular results. Plus, varying tempo with repeated slow and fast bouts allow for larger volumes of work to be performed with less muscular stress than the smaller volume that would be performed with just a set of fast-velocity contractions. 

5.    Match Resistance Curves to the Human Force Curves with Chains and Bands
An excellent way for more advanced lifters to overcome plateaus and vary tempo is to train with chains or bands attached to the barbells. This strategy is particularly effective in working the extensor muscles because attaching chains to a barbell will vary the amount of resistance your muscles have to contract against. For example, if you put chains on the ends of the barbell when squatting, the chains will pile up on the floor during the eccentric or down portion of the lift, decreasing the weight. As you come up from the squat during the concentric phase, the weight will increase as the chains come off the floor and contribute to your load. This is effective because it increases the weight during the weaker movement (you have less force capability concentrically), requiring you to train through the sticking or most challenging point of the lift.

A recent study of college football players found that the athletes significantly improved maximum strength and peak power from training with chains and bands. The players who trained with chains and bands improved their 1RM bench press by 10 kg versus players who did a traditional bench press and improved by only 7 kg after a seven week training program. Plus, researchers noted that weighted chains supply the added benefit of training the stabilizer muscles because they swing and oscillate throughout the range of motion of a lift.

You can use variable resistance on exercises such as deadlifts, squats, and bench presses or any exercise in which your progress has stagnated and to which you can reasonably attach chains or bands. Eccentric hooks (weights with hooks that hang off the sides of a barbell and drop off once the bottom of the dangling hooks hit the ground) load the lift in the opposite way, making the lift heavier during the eccentric down portion of the lift where you are naturally stronger. The hooks come off and you can then explode up with less resistance in the concentric motion.

Only train with variable resistance in one workout out of two at the most because it is very taxing to the neuromuscular system.

For more on tempo training read Tempo Training Revisited.

References
Tip 1: Gentil, P., Oliveira, E., Bottaro, M. Time under Tension and Blood Lactate Response during four Different Resistance Training Methods. Japan Society of Physiological Anthropology. 2006. 25(5), 339-344.

Tip 2: Tran, Q., Docherty, D., Boehm, D. The Effects of Varying Time under Tension and Volume Load on Acute Neuromuscular Responses. European Journal of Applied Physiology. 2006. 98, 402-410.

Tip 3: Desbrosses, K., Babault, N., Saglioni, G., Meyer, J., Pousson, M. Neural Activation after Maximal Isometric Contractions at Different Muscle Lengths. Medicine and Science in Sports and Exercise. 2006. 35(5), 937-944. 

Tip 4: Chapman, D., Newton, M.J., McGuigan, M.R., and Nosaka, K. Effect of Slow-Velocity Lengthening Contraction on Muscle Damage Induced by Fast-Velocity Lengthening Contractions. Journal of Strength and Conditioning Research. 2011, 25(1), 211-219.
Chapman, D., Newton, M., Sacco, P., Nosaka, K. Greater Muscle Damage Induced by Fast Versus Slow Velocity Eccentric Exercise. International Journal of Sports Medicine. 2006. 27(8), 591-598.

Tip 5: Ghigiarelli, J.J., Nagle, E.F., Gross, F.L., Robertson, R.J., Irrgang, J.J., Mylinski, T. The Effects of a 7-Week Heavy Elastic Band and Weight Chain Program on Upper-Body Strength and Upper-Body Power in a Sample of Division 1-AA Football Players. Journal of Strength and Conditioning Research. 2009. 23(3), 756-764.

Bellar, D., Muller, M., Barkley, J., Kim, C., Ida, K., Ryan, E., Bliss, M., Glickman, E. The Effects of Combined Elastic- and Free-Weight Tension vs. Free-Weight Tension on One-Repetition Maximum Strength in the Bench Press. Journal of Strength and Conditioning Research. 2011. 25(2), 459-463.


 

 

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