biodex SYSTEM 4 - Data Interpretation Guide; Definition of Terms

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7. Data Interpretation Guide
Definition of Terms
PEAK TORQUE (TQ) (ft-lb): Highest force output during a repetition. Indicative of a muscle's
strength capabilities.
AVG. PEAK TQ (ft-lb): The averages peak torque at each repetition. Represents the average
force output of a given set.
PEAK TQ/BW (%): Highest force output normalized to bodyweight. Compared to goal.
TIME TO PEAK TORQUE (ft-lb): A measure of time from the start of the muscular contraction to
the point of highest torque development. An indicator of the functional ability to produce
torque quickly.
ANGLE OF PEAK TORQUE (deg): A test of the functional ability of a joint showing the point in
the ROM where peak torque is achieved.
TORQUE AT 30° (ft-lb): Displays the torque produced for each direction at the pre-selected
position. The position of 30° is a critical point in knee stabilization, since the knee flexes to
about 30° during normal ambulation.
TORQUE AT 0.2 seconds (ft-lb): Displays the time rate of tension development. The time of 0.2
is preselected because it has been documented that, upon heel strike, it takes the leg extensors
0.2 seconds to develop enough force to support the body in normal ambulation. Possibly one of
the best indicators of a rehabilitated joint.
COEFFICIENT OF VARIANCE (%): Indicative of reproducibility of performance. Lower values
demonstrate higher reproducibility.
MAX REP TO TOTAL WORK (ft-lb): Total force output for the repetition with greatest amount of
work. Indicative of a muscle's capability throughout range of motion.
WORK/BW (%): Ratio displayed as a percentage of the maximum work repetition to the subject's
bodyweight.
TOTAL WORK (ft-lb): The sum of work for every repetition performed.
WORK FIRST THIRD, LAST THIRD (ft-lb): The entire activity is divided into thirds. This is the
total work of the first 1/3 of the reps and the last 1/3 of the reps.
WORK FATIGUE (ft-lb): The ratio of the difference, expressed as a percentage, between the
work in the first 1/3 to the work in the last 1/3 of the test bout. W(first 1/3) / W(last 1/3) = %
PEAK POWER (W): Peak power output (PPO), also known as peak work rate, is a common
measure of exercise intensity. The highest rate of doing work.