Page 65 of PP2ndEd: "...[T]here is limited experimental evidence that exercise or training of any type elicits increased testosterone production. More often than not, researchers have shown that...weight training effects testosterone levels minimally..." On the page following this, however, Rip and Kilgore actually provide evidence that intense weight training actually causes testosterone to drop and continue to drop for up to 48 hours in certain instances.
On page 68, the authors suggest that growth hormone levels peak slightly during the latter part of a workout but return to normal within an hour and a half following cessation of training.
-Stacey