In case of the wrist flexors, they have more PSCA than the extensors. The normal sarcomere lengths are on the ascending line. The wrist extensors have lower PSCA and their normal sarcomere length is on the descending line.

In case of full wrist extension, the wrist flexors will go in a more optimal length, while the same happens with the extensors who shorten and go "back" into more optimal zone. This makes that full wrist extension is more forcefull, compared to full wrist flexion, regardless of higher PCSA of the flexors.

If we train eccentric the normal rest lengths of the flexors will go to the plateau or top of the optimal length zone. At the same time the extensors will have longer length, and even descend more. When there will be full wrist extension. The elbow flexors will not be in the top or plateau but on the descending line. The elbow extensors will be shortened but not achieve the optimal plateau as before.

So eccentric training leads to problems, while there can still be hypertrophy. How can this be explained? Can this be the case in other muscles?