The full length aerobars on a road bike tend to provide longer extension. If you position your hands at the end of the longer extensions while staying planted on the saddle, the angle between your torso and humerus (bicep) becomes too open.

Your reach is too long with your hands at the tips of normal aerobars 250 mm or longer.

As a result, your humerus doesn't provide good skeletal support of the weight of your torso on the elbow pads. Your latissimus dorsi muscle and erector spinae muscles start to do the work.

Also, there is often a tendency to slide forward on the saddle with this configuration, almost inducing a steep- seat angle, open torso orientation. That is likely uncomfortable and will change the handling of your bike since it moves your center of gravity forward.

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Tom Demerly
The Tri Shop.com

don't you mean ITU regs?

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2020 National Masters Champion - M40-44 - 400m IM
Canadian Record Holder 35-39M & 40-44M - 200 m Butterfly (LCM)

because it's the natural position your hands assume if you are riding in a regular road position? there's a reason Cinelli's spinaci aerobars were shaped and sized as they were.

I thought it was a UCI regulation which forced the ITU to adopt it. Guess I had it backwards.