Some experts believe these fibers run horizontally and therefore stabilize the knee. Most studies relevant to physical therapy have analyzed possible vastus medial oblique (VMO) activation, a division of the vastus medialis. They each pull laterally and medially respectively to fix the kneecap within its groove called the femoral trochlea. They are concerned with the balance between the vastus lateralis and the vastus medialis. Patellofemoral pain syndrome (PFPS), sometimes known as runner’s knee, may occur in part due to a poor balance of the quadriceps muscles surrounding the patella or kneecap, though other muscles definitely play a role too. Physical therapists and exercise scientists have also been interested in balanced quads, albeit for a different reason. Though they all seem innervated by the femoral nerve, it may be more complex due to different nerve supplies among other factors. Since these muscles spread throughout the thigh, it makes sense that they should develop in proportion, if possible, for bodybuilding purposes. The rectus femoris is a superficial, two-headed muscle within the middle and top of the thigh, that attaches to both the knee and hip. The vastus intermedius is a deep, non-visible muscle within the middle of the thigh. The vastus lateralis is the largest and creates outer sweep. The vastus medialis forms the teardrop above and inside the knee. My view is that muscle length can be changed through valgus and varus positions, so a slight emphasis is possible.īodybuilders have historically aimed for balance among bodyparts, especially when striving for an aesthetic physique over sheer size. These usually rely on EMG though, which can be misleading. Most studies find that the vastus medialis cannot be emphasized over the vastus lateralis and vice versa.
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