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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