Methods for Measurement of Moment of Segmental Inertia Using a Dynamometer

Abstract: Moments of inertia of limb segments are essential to calculate parameters related to the segmental rota-tion. To analyze the human motion accurately and specifically, moments of inertia obtained from the individual arerequired. In this study, a simple method to determine a subject-specific moment of segmental inertia using a dyna-mometer is introduced. In order to evaluate the method, one male participated to test for his forearm plus hand ona commercial dynamometer. Three passive speeds, i.e. 240, 270, and 300 o /s, were chosen to confirm whether themoment of inertia values at each speed approach to a fixed value. The same procedure was repeated on the day afterto evaluate whether the method is reproducible. As the results, there were no significant differences among thespeeds and between the days. The value of the moment of the forearm inertia was 0.216 kg · m 2 that is apparentlyhigher compared to values by previous models. Nonetheless, it seems to be acceptable based on our body mass indexanalysis using reported subject height and mass in each previous study. According to our results, the developedmethod could be useful to determine the segmental moment of inertia of an individual, showing no significant dif-ferences among the speeds and between the days. Thus, we believe that our results are reliable according to twoappropriate evaluation procedures. This finding would be helpful to calculate segmental rotation related parametersof an individual.Key words: Forearm, forward dynamics, inverse dynamics

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