Reference for Chagigah 32:17

לעולם אימא לך בעינן בכל כחו דאמר להו אקפו ידייכו אי הכי לא מפני שסמיכה בנשים תיפוק ליה דאינה לסמיכה כלל

[The Talmud responds:] Actually, I would tell you that all of one's strength is required [to perform the laying of the hands correctly, however the tale of Abba Elazar was describing a case] where he told the women: "Hold your hands lightly!" If this is true [ie. that the women were told to hold their hands lightly], [what need was there for Abba Elazar to say] "not because the laying of the hands applies to women" Let him simply have said that these women weren't performing the laying of the hands [because they were not pressing down with all of their strength]!

Jastrow