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Advanced biomechanical analysis- lecture 7 Isokinetic dynamometry
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lecture notes on isokinetic dynamometry, how to conduct IKD testing safely & effectively, the theory behind IKD and key considerations for certain protocols.

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  • February 23, 2021
  • 3
  • 2020/2021
  • Lecture notes
  • Wilmott
  • All classes

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Applied Biomechanical Analysis- lecture 7- Isokinetic dynamometry


Dynamometry= measurement of strength
Isokinetic= constant speed
The basic theory centres on balanced torques- the torque produced by the machine
is equal to the torque made by the participant. Isokinetic means no angular
acceleration & no net torque/moment.


Joint function
The joint torque is the sum of the torques from various muscle-tendon units that
cross the joint. It is not possible to measure torque produced by a single muscle, as
the torque at any moment is affected by many factors. The factors affecting torque
include:
 The inherent muscle ‘strength’
 The level of muscle activation
 The current joint angle
 The joint angular velocity
 The muscles recent history (including fatigue)


Muscle strength- the maximum force a muscle can produce is affected by muscle
size, and fibre arrangement (parallel vs pennate).
Muscle activation- corresponds to level of ‘neural drive’ arriving at motor units. The
most common level is the maximum voluntary contraction (MVC). % of MVC can be
dfined but isn’t easy.
Joint angle- changes in joint angle can cause changes in the muscles moment arm.
Recent history- fatigue?- inability to maintain level of joint torque over a sustained
contraction & repeated contractions.


Steps in IKD analysis
 Create a protocol
 Enter participant details
 Set-up dynamometer
 Explain process to participant
 Warm-up
 Run tests
 Analyse results & give feedback
Safety issues

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