Prediction of segmental parameters using the Hanavan human body model.

The Hanavan mathematical model of the human body was updated utilizing Clauser et al.'s multi-step weight distribution regression equations. The influence of these equations upon the predicted segment weights, specific gravities and principal moments of inertia of 30 adult male athletes was compared to that of Barter's regression equations employed in the original model. Both methods resulted in descrepancies between actual body weight and the predicted sum of the segment weights with Barter's equations consistently underestimating total body weight by an average of 2.03% and Clauser et al.'s overestimating it by 4.59%. Proportional distribution of the discrepancies produced corrected segment weights which were used in the Hanavan model. Clauser et al.'s equations predicted heavier trunks and thighs, and lighter heads, upper arms, forearms and hands with these differences being reflected in the specific gravities and principal moments of intertia. While it was not possible to establish the definite superiority of Clauser et al.'s equations in the prediction of body segment parameters, it is suggested from inferential evidence that they be used in subsequent biomechanical investigations of adult male athletes which involve the Hanavan model. It is also recommended that continued efforts be made to refine the Hanavan human body model.