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--- visual3d:documentation:definitions:adjusted_zatsiorsky-seluyanov_s_segment_inertia_parameters [2024/11/15 15:24] – wikisysop
+++ 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 ======
-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 =====
-  * Relative to total body mass.
+^ Segment Mass (Relative to total body mass)^ ^ ^
+^Segment  ^Female^Male  ^
-|Segment  |Female|Male  |
 |Head     |0.0668|0.0694|
 |Trunk    |0.4257|0.4346|
@@ Line 18: / Line 17: @@
-==== Segment Centre of Mass Location ====
+^ Segment centre of mass location (relative to the segment's proximal endpoint) ^ ^ ^
+^Segment  ^Female^Male  ^
-  * Relative to the segment's proximal endpoint.
-|Segment  |Female|Male  |
 |Head     |0.4841|0.5002|
 |Trunk    |0.4964|0.5138|
@@ Line 33: / Line 28: @@
 |Foot     |0.4014|0.4415|
-==== Segment Radii of gyration ====
+^ Segment radii of gyration ^ ^ ^ ^ ^ ^ ^
+^         ^Female^     ^     ^Male ^     ^     ^
-|Segment  |Female|     |     |Male |     |     |
+^Segment  ^IXX   ^IYY  ^IZZ  ^IXX  ^IYY  ^IZZ  ^
-|         |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 45: / 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 images show 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}}  |
 **1.** Change the **segment geometry** to CUSTOM_SEG
@@ Line 67: / Line 58: @@
  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)
@@ Line 76: / Line 67: @@
  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.