 # VBT Dictionary

This week we wanted to define some key phrases, buzzwords, and practices used with Velocity Based Training. Often and without even realizing it, coaches and athletes alike can misuse terminology associated with strength training and VBT, so we wanted to provide a quick at-a-glance look at some key definitions. We’ll also provide some equations to hopefully shed more light on some of these terms. All citations can be found at the bottom. Without further ado:

## VELOCITY:

Measure of how quickly an object moves. The change in the position of an object divided by the time it takes. Velocity is a vector quantity and therefore has direction. Velocity is measured in m/s.

Velocity = (final position) - (initial position) / time

Velocity = displacement / time

## POWER:

The rate at which work is done. Measured in Watts (W).

Power = work / time

Power = force x displacement / time

Power = force x velocity

## FORCE:

The mass of an object multiplied by its acceleration, it has both magnitude and direction. Measured in Newtons (N)

F = mass x acceleration

## SPEED:

Distance traveled per unit of time; how fast an object moves regardless of direction

Speed = distance / time

## VELOCITY BASED TRAINING:

The training methodology of utilizing a piece of technology to track the movement speed in a given direction of an exercise

## PERCENTAGE BASED TRAINING:

The training methodology of utilizing various percentages of an individual’s one repetition maximum (1RM) in order to determine the weight used in each training session.

## 1RM:

One repetition maximum; the maximum amount of weight a person can lift for a single repetition of a given exercise.

## AUTOREGULATION:

A form of periodization that adjusts to the individual athlete’s adaptations on a day-to-day or week-to-week basis

## MEAN (VELOCITY OR POWER):

The average of all numbers; a calculated central value defined by adding up all numbers and divided by how many numbers there are

m = sum of terms / number of terms

## PEAK (VELOCITY OR POWER):

The maximum or highest value in a wave (upward motion)

## ECCENTRIC:

In weightlifting, movement that lengthens a muscle while concurrent contraction occurs. Typically the lowering portion of a movement.

## CONCENTRIC:

In weightlifting, movement that shortens a muscle while concurrent contraction occurs. Typically the raising portion of a movement.

## ISOMETRIC:

In weightlifting, a static muscular contraction without any visible movement or change in the joint angle.

The amount of weight on the bar

## FATIGUE:

In weightlifting, failure to maintain the required or expected force due to muscular exhaustion. The inability of a muscle to continue to contract.

## EFFORT:

Specifically for VBT, the “intent” to perform a lift with maximum concentric acceleration. Alternatively, a vigorous or determined attempt.

## INTENSITY:

In weightlifting, the difficulty of an exercise. In some circles, “how heavy” defines intensity. In physics, power transferred per unit area (W/m2)

## VOLUME:

In weightlifting, the number of repetitions of a given exercise or training session

## EXERTION:

The effort put forth of an individual on a given rep or set

## FREQUENCY:

How often an individual performs something (a rep, a set, a workout etc)

## MINIMUM VELOCITY THRESHOLDS:

Usually the velocity associated with the last successful rep in a maximal effort set, this will then serve as the cutoff velocity for maximal efforts in the future.

## MEAN PROPULSIVE VELOCITY:

The average velocity from the start of the concentric phase until the end of the movement where the acceleration is greater than the acceleration due to gravity (all data points in the concentric movement above where acceleration of barbell is greater than -9.81m/s and averaged)