Gender differences in strength levels

In 1998 I wrote, published and claimed copyright on this concept (bolding added now):

Women have been found to be able to do a greater no. of reps at a given %age of their RM than men

I was conducting research and I came upon the following exercise in a publication copyright claimed by another 'author' at a subsequent date (bolding added):

Gender – at a given %age of 1RM a woman will always perform more reps than a man.

And I said to myself: “That looks familiar!” So I cross-referenced it and I said to myself: “Wow! No wonder that looked familiar!”

And I came upon this wording another one more times by the same 'author' in different publications - in the absence of credits or references to the origin or permission to use from the original author (myself), and that the 'author' claimed copyright....