I for one would love to see a reference on the studies you mention
correlating back injury to "weak spine extensors." Please share them.
Barrett L. Dorko, P.T.
http://barrettdorko.com>
At 03:38 PM 4/21/00 -0400, you wrote:
>As a longtime step aerobic instructor, I have often wondered why it is
>contraindicated to step forward off the bench. I realize that each individual
>performs this movement and creates the same stresses on the knee on a daily
>basis as we descend stairs. However, when you are discussing group fitness
>classes, usually it is not geared toward a specific population. Also, the
>instructor usually does not have the opportunity to determine the
>participant's past medical history. Therefore, any movements you perform must
>be as safe as possible for all participants with variety of medical pasts. I
>agree that other sports and activities violate this and other fitness "rules"
>(such as not bearing weight with the knee joint beyond the supporting foot,
>and not coming up to standing with a neutral spine). These movements would be
>appropriate to do, as long as no pre-existing knee or back injury is present.
>In a situation where the fitness leader is aware of these problems (such as
>personal training, or group personal training) there is no reason why those
>"rules" should be obeyed. Also in these situations, the leader is able to get
>feedback as to how the movement feels in the person's body. If pain is
>experienced in the knees when stepping forward, then it should not be done.
>In a group class, this feedback does not occur.
>
>On the other hand, we must think of the repercussions of NOT doing these
>movements. For example, studies are showing that frequent aerobic class
>participants are experiencing back problems because of weak spine extensors.
>It is theorized that since the torso is never righted with a neutral spine for
>fear of injuring or causing pain, the extensor muscles have not been
>strengthened along with the other muscles of the body. Since I heard this
>data, I always encorporate righting the spine in neutral instead of coming up
>through flexion. I also, and encourage others, to include back extensor
>strengthing exercises along with those abdominal exercises.
>
>Let me know what you think.
>
>Amanda L. Saviers, Student P.T.
>Ohio, U.S.
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