A Scale of Perception for Bar Velocity

Questionnaires have been around for a long time and been found to be valid and reliable once the athlete is properly anchored to the scale. While it may sound simple, there is actually a lot of complexity within the simplicity of just asking a person a few questions regarding how they feel today or how hard they felt a particular activity was (RPE). However, once the individual understands what they are being asked, and gains some experience rating themselves, usually about 4 weeks,  questionnaire data can be very helpful in planning training. (I have been a fan of using questionnaire data as a method of understanding how an athlete is tolerating training for several years and wrote about the daily questionnaire I use in a previous blog article.)

Recently, Bautista and colleagues (2014), have attempted to create a new scale, which allows the athlete to rate their perception of bar velocity in the bench press (CLICK HERE for full paper).

Measuring bar velocity is incredibly helpful and is done by attaching some sort of linear position transducer to the bar to objectively measure the speed at which the bar is moving through various lifts (E.g., bench press, squat, deadlift). The 1RM of the subjects in the study was established prior to using the rating scale, during an incremental load protocol. A linear position transducer was used to understand bar velocity at various percentages of the individual’s 1RM during the incremental load test:

  • Light = < 40%
  • Medium = 40% – 70%
  • Heavy = > 70%

Over a 5 day testing period, the subjects performed each set in a random order, using the intensity parameters above, and were blinded to the amount of load on the bar via partial occlusion pads, which prevented them from seeing the weight. The subjects performed 2-4 repetitions with a given load and then provided their perception of bar velocity using a scale developed by the authors, based on bar velocity during the incremental load 1RM test:

Screen Shot 2014-09-07 at 5.09.39 PM

The verbiage below the numbers, used to anchor the subjects during the experimental portion of the test, was established using the corresponding bar speed form the incremental load 1RM test and the verbal qualification provided by the subjects following each of their lifts during the initial test.

A high correlation was found between the actual bar velocity and the perception of bar velocity provided by the subjects, particularly as their use of the scale increased. Thus, greater exposure and time using the scale improved their ability to properly classify their lift.

Practical Use

As stated earlier, I am a big fan of questionnaires. While they are especially helpful when combined with other objective data (GPS, HR, Fitness Testing, Bar Velocity, etc) as a stand alone they can provide rich information once the athlete is properly anchored to the scale.

I see the Rating of Bar Velocity scale used in this study being practical in a few ways:

  1. Not all strength and conditioning programs have funds to provide a linear position transducer unit at each lifting platform. However, if athletes gain an understanding and awareness of how to rank their bar velocity, this method can be useful as an inexpensive means of determining individual percentages for power training. (NOTE: I do think it would be of value to at least have one or two linear position transducers available to allow the athletes to initially understand how fast they are moving the bar, as well as to have available on testing days.)
  2. Not all athletes will move the same relative intensity at the same speed. This will allow the coach to adjust the training intensity up or down for the athlete, in order to stay in their ideal zone of bar speed, depending on the training goal for the day.
  3. Similar to using a Rating of Perceived Exertion on a fitness test, the Rating of Perceived Velocity can be used on a strength test or Rep Max test and charted over time to show improvement with the same load or the same relative intensity.
  4. Finally, having athletes rank their efforts like this, I find, increases their awareness of the training session and engages them more in what they are doing. Rather than going through the motions, the athlete has to now be conscious of what (s)he is trying to do.