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Health & Medical >> Any biomechanics people here - help needed
| 12/13/10 9:04 PM | |
groundfighter2000
113 
Member Since: 1/1/01 Posts: 30409 |
I was wondering if you could help me out. I need help on how to calculate joint reaction forces, ground reaction force and torques. Basically I'm doing a mini project on runners with a forefoot strike vs. heel strike for my biomechanics class. I have two pictures of the same runner one doing a heel strike, and one doing a foot strike. I've made free body diagrams of them, (two link models, separating the foot and the lower leg). And I have an anthropometric table, so that I can measure the segments and use the table to figure out the Center of Mass for the segment. I guess I'm just not getting where the angles come into play . And I have to put in my own numbers/data cause there is none available. So I am gonna go by the assumption that this runner is 150 lbs. Here are the pictures: Heel Strike 
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| 1/7/11 8:21 PM | |
Mocrates
Member Since: 10/31/10 Posts: 68 |
You need to post free body diagrams with at least velocities. Then I can figure out if I even remember enough physics to help you. One thing to consider is that the forefoot strike has more of a roll to it, as opposed the heel strike which is more a true strike with much higher registries on force plates. Here is a video of the study conducted at Harvard http://bcove.me/0idl250j |
| 1/7/11 8:25 PM | |
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Mocrates
Member Since: 10/31/10 Posts: 69 |
After looking at the video, you definitely need the descending velocity vector of the foot to be able to calculate forces and torques. |
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