HAS-Motion Software Documentation

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segment |female|male | |head |0.0668|0.0694| |trunk |0.4257|0.4346| |upper arm|0.0255|0.0271| |forearm |0.0138|0.0162| |hand |0.0056|0.0061| |thigh |0.1478|0.1416| |shank |0.0481|0.0433| |foot |0.0129|0.0137| * relative to total body mass. ===== segment centre of mass location ===== |segment |female|male | |head |0.4841|0.5002| |trunk |0.4964|0.5138| |upper arm|0.5754|0.5772| |forearm |0.4559|0.4574| |hand |0.7474|0.7900| |thigh |0.3612|0.4095| |shank |0.4352|0.4395| |foot |0.4014|0.4415| * relative to the segment's proximal endpoint. ===== segment radii of gyration ===== |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| |upper arm|0.278 |0.260|0.148|0.285|0.269|0.158| |forearm |0.261 |0.257|0.094|0.276|0.265|0.121| |hand |0.631 |0.454|0.335|0.628|0.513|0.401| |thigh |0.369 |0.364|0.162|0.329|0.329|0.149| |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 ===== 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.\\ \\ | __**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 | 1 - change the **segment geometry** to custom_seg 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).\\ 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. ixx = ( 0.1478*mass ) *((rth_seg_length * 0.369 )^2)\\ iyy = ( 0.1478*mass ) *((rth_seg_length * 0.364 )^2)\\ izz = ( 0.1478*mass ) *((rth_seg_length * 0.162 )^2)\\ 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. ===== reference ===== de leva (1996) adjustements to zatsiorsky-seluyanov's segment inertia parameters. **journal of biomechanics** vol.29 no. 9. pp.1223-1230. }}