18-22. Hip positions during hamstring curl exercise FIGURE1 FIGURE 2 Look at fig
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18-22. Hip positions during hamstring curl exercise FIGURE1 FIGURE 2 Look at figure I above. What is the movement action at the knee when the hamstrings concentrically contract in A and B? What is the position of the hips in A (# of degrees)? What is the position of the hips in B (Approx. # ofdegrees)?- Which bench design will best work the hamstrings? WHY? 1. 2, 3, 4. Look at Figure 2 above. 1. What are the hip positions in A and about how many degrees?In B, and about how many degrees? 2. What ONE JOINT muscle(s) extend the knee? 3. What TWO JOINT muscle extends the knee? 4. Which position (A or B) best works the rectus femoris? Why? Which position best works the vasti muscles? WHY? 5.Explanation / Answer
Figure 1 :
1. The movement of action at knee when hamstrings concentrically contract in both figures A & B is flexion.
Hamstring muscles are posterior thigh muscles between hip and knee. The concentric contraction of the hamstrings causes the legs to move back so it causes extension of hip and flexion of knee.
2. The position of hip in figure A is prone position and 0 degrees.
Basically there are 4 positions of hip namely supine with 90 degree flexion at hip and knee, sitting, prone, supine with 0 degree hip extension and 90 degree knee flexion.
3. The position of hip in figure B is prone position with little flexion at hip. It may be an acute angle of 15-30 degrees.
4. Hamstrings are mainly used for running as they cause extension of hip and flexion of knee. Therefore running is best breach design where hamstrings work the best.
Figure 2 :
1. The position of hip in figure A is sitting position and is about 60 degrees.
The position of hip in figure B is sitting and is about 60 degrees at hip with little extension of knee joint about 45 degrees.
2. The joint muscle the extends the knee is quadriceps muscle group it contains four muscle namely rectus femoris, vastus medius, vastus lateralis, vastus intermedius.
3. Quadriceps muscle group. (Please refer above answer)
4. B. Because rectus femoris is one of the quadriceps muscle that helps in the extension of knee. In figure B there is more extension of knee when compared to figure A.
5. B. Because vasti musucles also belong to quadriceps group that helps in knee extension. In figure B there is more extension of knee when compared to figure B.
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