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| Author(s): |
Rogério Pessoto Hirata
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Escola de Educação Física e Esportes (EEFE/BT) |
| Defense date: | 2006-03-17 |
| Examining board members: |
Marcos Duarte;
Ricardo Machado Leite de Barros;
Carlos Ugrinowitsch
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| Advisor: | Marcos Duarte |
| Abstract | |
There is a wide spread notion among health professionals that during a squat exercise the knee should not pass forward the forefoot region in order to not overload the knee joint. However, it seems there isnt scientific literature to support or negate this concept. The goal of this paper is to investigate the effect of different foot-knee positions on the knee joint moment and on the patelofemoral force during squat, which was performed into two different ways: a) knee do not passing the forefoot region; b) knee passing the forefoot region. The subjects performed the squat exercise with the right foot on a force plate that measured the ground reaction force and moment components. The subjects right leg (foot, shank, and thigh) and pelvis were filmed with five digital cameras. In order to reconstruct the segments movement, we used the Calibrated Anatomical System Technique (CAST), improving the accuracy on three-dimensional reconstruction of segments position. The hip center was determined by the rotational method and the internal net forces and torques were estimated by inverse dynamics. The results showed that during the condition were knee passed the forefoot region, the knee passed 11 cm on average, what resulted in a peak of mechanical load on the knee 30% higher in relation to the do not pass condition. Based on these results it is suggested that the knee should not pass the forefoot region during squatting in order to decrease the patelofemoral force. (AU) | |