Part 1 was a simplified model of the person\'s musculoskeletal system; not all o
ID: 44412 • Letter: P
Question
Part 1 was a simplified model of the person's musculoskeletal system; not all of the muscles involved were accounted for. Now, explain how you would find the muscle forces when considering the rectus femoris, gastrocnemius, and tibialis anterior muscles in addition to the vasti, hamstrings and soleus considered in Part 1. From inverse dynamics Tankle = 22 Nm Tknee = -83 Nm Thip = 7 Nm From imaging data: Rectus femoris hip flexion moment arm = 6.0 cm Rectus femoris knee extension moment arm = 4.0 cm Gastrocnemius knee flexion moment arm = 3.0 cm Gastrocnemius ankle extension moment arm = 2.5 cm Tibialis anterior ankle flexion moment arm = 1.5 cm Describe how to find muscle forces: Fsoleus Fhamstrings Fvasti Fgastrocnemius Ftibialis anterior Frectus femorisExplanation / Answer
All these muslces are involved in human locomotion
f soleus ;
the force on the solus muscles increasing with the walking , it is mechanically independent of the at various physiological lengths and various positions
f hamstring ;
they need to exert more force during the lengh of contraction of the muscle , inorder to caluclulate the hamstring muscle force at various angles we need to fin dthe angular velocity and angular accleration , hamstring contraction is equal and opposite to the isodynamic dynamometer M ham = Mcy , aceeleration = 0 , should be taken , Fx = Mcy /mi
f gastrocinemus muscle ; it is the mucel present in the lower part of the leg called calf , it is also called stomach of the leg
f tibilalis anterioris ; present in the tibia region , located near the shin , inolved in dorsi flexing and inverting of the feet .
f vastus ; it is the part of the quadreceps muscles , it is a knee extensor they are three types one is the intermedialis , lateralis medialis
f rectus femoris ;
it is the largest muscle in the quadreceps , and involved in the center and front of thethigh region and is biaxila muscle , ther fore large forces are transmitted during the running and juming
inorder to caluculate the general muscle forces ;
Fm = specific tension * cross sectional area
force in the qudraceps is caluculated by
Fm = cKA sigma EMG ,
k isthe factor effecting the muscle length , , c i sthe weight coefficinet , A cross sectional area , sigma - specific tension , Emg , amplitude