Modelo 3D para quantifica？？o das for？as articulares e momentos proximais resultantes para o membro superior

objectives: the aim of this study was to implement a biomechanical model, with linked segments associated with inverse dynamics, to analyze proximal net forces and moments during different upper limbs？ activities. methods: one male subject performed flexion, extension and abduction of the shoulder and flexion of the elbow. the model is composed of five connected rigid segments (hand, forearm, arm, scapula and trunk). the newton-euler motion equations were used to quantify proximal net reaction forces and moments. for kinematics recording, five cameras with a frequency sample of 50 fps were used. videogrammetry accuracy was, on average, 1,7mm. the following muscles had their activities monitored: deltoid (anterior, medial, posterior), biceps brachialis, triceps brachialis, pectoralis major. the model was evaluated by qualitative comparison of proximal net moments with electromyographic signal of agonist muscles. results: the results showed a temporal synchronism between the proximal net moments and agonist emg activity. conclusions: the model was able to estimate proximal net forces and moments during different upper limbs？ activities.