Is it ok heart rate 86-92 3 hours after working out? I take 50mg atenolol. Heart rate in the 70's usually. Why when after work out stays a little high?

It's fine . Maybe you're a bit dehydrated but it's nothing to worry about. A better question might be: why are you even checking your pulse? Seems like you're over thinking this one. Be glad you're exercising and enjoy your day. .