Ariza, Garcia surprised at news that Rios tested positive

SAN ANTONIO – Brandon Rios’ strength-and-conditioning coach Alex Ariza was surprised at a ringtv.com report Friday that Rios tested positive for a banned stimulant after Rios lost a unanimous on Nov. 23 to Manny Pacquiao in China.

“It’s been three weeks, and then, all of a sudden, something like this comes out,’’ Ariza told reporters Friday at the weigh-in for the Adrien Broner-Marcos Maidana card Saturday night at the Alamodome. “He tested four times through the whole camp, and then, nothing. We showed them everything, and we disclosed everything that we were using. They never said anything or complained about it. Now, all of a sudden, this comes out? It just seems a little bizarre to me.”

Rios promoter Bob Arum told ringtv.com that Rios tested positive for dimenthylamylamine, a substance found in controversial over-the-counter supplements.

In the ringtv.com story, Dr. Margaret Goodman of VADA confirmed that Rios tested positive in one of five tests. VADA conducted the testing before and after the welterweight bout in Macao. Goodman told ringtv.com that Pacquiao, also promoted by Arum, passed all five tests.

“It’s some kind of dietary supplement that can be obtained over the counter, so I don’t know any details,’’ said Ariza, who joined Rios after a fallout with Pacquiao trainer Freddie Roach. “Everybody takes stuff that they sell at GNC or at vitamin shops and stuff like that.”

Rios trainer Robert Garcia also was surprised. He said he had never heard of the banned substance.

“I have no idea what it is,’’ said Garcia, also Maidana’s trainer. “We’re dealing with some words that I’ve never heard before.”

Dimenthylamylamine is considered dangerous, according to a warning issued by the Food and Drug Administration. The substance has been linked to fatal heart attacks.

It wasn’t known Friday whether Rios faced any consequences. China’s introduction to pro boxing includes a new commission, but its rules and enforcement powers aren’t clear.