8. The Erector spinae muscles (i.e the back extensor muscles) have to contract t

Question

8. The Erector spinae muscles (i.e the back extensor muscles) have to contract to hold the body in this posture. If the moment arm of the erector spinae muscles about the L5-S1 joint is 5 cm, how much force should they generate to hold the load in this posture? Force exerted by erector spinae Figure 1. L5-S1 joint during lifting from sfu.ca 9. As you can imagine, a high force exerted by the back muscles increases the chances of injury. How could you adjust your technique to reduce the force exerted by the erector spinae muscles? Explain why (Hint: Think about how you could reduce torques created by the box and the body segments about the L5-S1 joint) 10. Most Olympic gymnasts are generally short in stature (estimates of average height range between 5'4" and 5'7") - why might this be? (Hint:Think about someone like Shaquille O Neal doing the iron cross shown in Figure 2) Figure 2. A gymnast doing an Iran-Cross lfrom: ewagym.com

Explanation / Answer

10. Most Olympic gymnasts are generally short in stature. Why might this be?

The advantage of a Gymnast being short in stature are given below as :

Strength = Shorter gymnasts are more muscular than taller gymnasts. Shorter, muscular gymnasts can accomplish higher-level vaults because they travel down the runway with more power.

Considerations = U.S. gymnasts are growing taller and finding ways to adjust their skills appropriately for their height. The top gymnasts often used to stand shorter than 5 feet. In 2008, when the U.S. team took the silver medal, only one gymnast on the U.S. team stood below 5 feet.

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