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--- visual3d:documentation:definitions:adjusted_zatsiorsky-seluyanov_s_segment_inertia_parameters [2024/06/26 20:21] – created sgranger
+++ visual3d:documentation:definitions:adjusted_zatsiorsky-seluyanov_s_segment_inertia_parameters [2026/06/12 17:11] (current) – Added cross-reference and links to Visual3D's default parameters from Dempster 1955. wikisysop
@@ Line 1: / Line 1: @@
-====== Adjusted_Zatsiorsky-Seluyanov's_segment_inertia_parameters ======
+====== Adjusted Zatsiorsky-Seluyanov's segment inertia parameters ======
-While the original Zatsiorsky-Seluyanov segment inertia parameters (1983) used bony landmarks as reference points, de Leva (1996) adjusted these parameters using joints centres instead, more commonly used in biomechanics. This page lists these adjusted parameters and describes how to used them in Visual3D.
+While the original Zatsiorsky-Seluyanov segment inertia parameters (1983) used bony landmarks as reference points, [[https://doi.org/10.1016/0021-9290(95)00178-6|de Leva (1996)]] adjusted these parameters using joints centres instead, more commonly used in biomechanics. This page lists these adjusted parameters and describes how to used them in Visual3D.
-==== Segment Mass ====
+===== The Adjusted Parameters =====
-|Segment  |Female|Male  |
+^ Segment Mass (Relative to total body mass)^ ^ ^
+^Segment  ^Female^Male  ^
 |Head     |0.0668|0.0694|
 |Trunk    |0.4257|0.4346|
@@ Line 15: / Line 16: @@
 |Foot     |0.0129|0.0137|
-  * Relative to total body mass.
-==== Segment Centre of Mass Location ====
+^ Segment centre of mass location (relative to the segment's proximal endpoint) ^ ^ ^
+^Segment  ^Female^Male  ^
-|Segment  |Female|Male  |
 |Head     |0.4841|0.5002|
 |Trunk    |0.4964|0.5138|
@@ Line 29: / Line 28: @@
 |Foot     |0.4014|0.4415|
-  * Relative to the segment's proximal endpoint.
+^ Segment radii of gyration ^ ^ ^ ^ ^ ^ ^
+^         ^Female^     ^     ^Male ^     ^     ^
-==== Segment Radii of gyration ====
+^Segment  ^IXX   ^IYY  ^IZZ  ^IXX  ^IYY  ^IZZ  ^
-|Segment  |Female|     |     |Male |     |     |
-|         |IXX   |IYY  |IZZ  |IXX  |IYY  |IZZ  |
 |Head     |0.271 |0.295|0.261|0.303|0.315|0.261|
 |Trunk    |0.307 |0.292|0.147|0.328|0.306|0.169|
@@ Line 43: / Line 39: @@
 |Shank    |0.267 |0.263|0.092|0.251|0.246|0.102|
 |Foot     |0.299 |0.279|0.139|0.257|0.245|0.124|
-\\
-==== Modifying the Inertial Values using the Adjusted Zatsiorsky-Seluyanov's parameters ====
+===== Modifying Inertial Values within Visual3D =====
-Below is on image the default segment properties (on left) and the modified segment properties (on right). The modified segment properties reflect Zatsiorsky's adjusted segment properties for a female's right thigh.\\
+The images below show the default segment properties on the left and the modified segment properties on the right. The modified segment properties reflect Zatsiorsky's adjusted segment properties for a female's right thigh.
-\\
-|  __**ORIGINAL**__\\ This is an example of the **original** properties using Hanavan's geometric model.\\ {{HanavanInertialProperties.png}}  |  __**MODIFIED**__\\ This is an example of the **modified** properties using De Lava's values.\\ {{deLevaInertialProperties.png}}  |
+|  __**ORIGINAL**__\\ This is an example of the **original** properties using Hanavan's geometric model.\\ {{:HanavanInertialProperties.png}}  |  __**MODIFIED**__\\ This is an example of the **modified** properties using De Leva's values.\\ {{:deLevaInertialProperties.png}}  |
- - Change the **segment geometry** to CUSTOM_SEG
+**1.** Change the **segment geometry** to CUSTOM_SEG
- - To modify the **Mass**, replace the mass factor from the current equation (0.1* Mass) to Zatsiorsky-Seluyanov mass value(For example: "0.1478 * Mass" for a female thigh segment).\\
+**2.** To modify the **Mass**, replace the mass factor from the current equation (0.1* Mass) to Zatsiorsky-Seluyanov mass value(For example: "0.1478 * Mass" for a female thigh segment).\\
- - To modify the **Inertia Values**, the expression has to be entered as: "m*r^2"\\
+**3.** To modify the **Inertia Values**, the expression has to be entered as: "m*r^2"\\
 Where m is the segment's mass parameter, and r is the IXX, IYY or IZZ radius of gyration parameter. The radius of gyration in De Lava's paper is presented as a percent of segment length, so this value must be multiplied by the length of the segment.
-For example, to use the Zatsiorsky-Seluyanov's Inertia Values for the right thigh for a female subject, the following expressions would have to be entered in the IXX, IYY and IZZ fields.
+ For example, to use the Zatsiorsky-Seluyanov's Inertia Values for the right thigh for a female subject, the following expressions would have to be entered in the IXX, IYY and IZZ fields.
-IXX = ( 0.1478*Mass ) *((RTH_SEG_LENGTH * 0.369 )^2)\\
+  IXX = ( 0.1478*Mass ) *((RTH_SEG_LENGTH * 0.369 )^2)
-IYY = ( 0.1478*Mass ) *((RTH_SEG_LENGTH * 0.364 )^2)\\
+  IYY = ( 0.1478*Mass ) *((RTH_SEG_LENGTH * 0.364 )^2)
-IZZ = ( 0.1478*Mass ) *((RTH_SEG_LENGTH * 0.162 )^2)\\
+  IZZ = ( 0.1478*Mass ) *((RTH_SEG_LENGTH * 0.162 )^2)
- - To modify the location of the **center of mass** according to Zatsiorsky-Seluyanov's parameters, replace the factor from the current equation (0.444004 * RTH_Seg_Length in the above image) with the corresponding Centre of Mass location parameter (for example: "0.3612 * RTH_Seg_Length" for a female thigh segment).
+**4.** To modify the location of the **center of mass** according to Zatsiorsky-Seluyanov's parameters, replace the factor from the current equation (0.444004 * RTH_Seg_Length in the above image) with the corresponding Centre of Mass location parameter (for example: "0.3612 * RTH_Seg_Length" for a female thigh segment).
-  * The segment length (RTH_SEG_LENGTH) is listed under the Subject Data / Metrics tabs. This value is automatically created when a segment is created.
+ The segment length (RTH_SEG_LENGTH) is listed under the Subject Data / Metrics tabs. This value is automatically created when a segment is created.
-==== Reference ====
+===== See Also =====
-de Leva (1996) Adjustements to Zatsiorsky-Seluyanov's segment Inertia Parameters. **Journal of Biomechanics** Vol.29 No. 9. pp.1223-1230.
+Visual3D's default segment parameters are derived from [[visual3d:documentation:modeling:segments:segment_mass#default_segment_mass|Dempster's 1955 equations]].
+===== Reference =====
+  * de Leva (1996) Adjustments to Zatsiorsky-Seluyanov's segment Inertia Parameters. **Journal of Biomechanics** Vol.29 No. 9. pp.1223-1230. [[https://doi.org/10.1016/0021-9290(95)00178-6|DOI]]
+  * Dempster, W. T. (1955). Space requirements of the seated operator, geometrical, kinematic, and mechanical aspects of the body with special reference to the limbs (No. WADCTR55159) [[https://hdl.handle.net/2027.42/4540|link]]
+  * Zatsiorsky, V. M., & Seluyanov, V. (1983). The mass and inertial characteristics of the main segments of the human body. In H. Matsui & K. Kobayashi (Eds.), Biomechanics VIII-B (pp. 1152-1159). Baltimore: University Park Press.