Thread:TUSF/@comment-68.197.166.117-20150715214706/@comment-6697950-20150716095829

The Japanese version of that sentence is 脳から自分の体に向けて出力される命令をも遮断・回収されるのだから. Although Yen Press omitted some of the words, the meaning is pretty much the same. However, that's not the part that you should be looking at. The real problem is page 35 of the Japanese version (page 18 of Yen Press)

「できないよ、どっちも. 俺たちは今、生身の……現実の体を動かせないんだ. ≪ナーヴギア≫が、俺たちの脳から体に向かって出力される命令を、全部ここで……」

“That's impossible, both of them. Right now, we can't move our bodies... our real bodies. The «NerveGear» intercepts all the commands that our brain is sending to the body, here…”

指先で後頭部の下、延髄をとんと叩く.

I tapped the below the back of my head, the medulla oblongata.

「……インタラプトして、このアバターを動かす信号に変換してるんだからな」

“……And converts them to signals to move our avatars.”

[...]

ナーヴギアは、フルダイブ環境を実現するために、脳から脊髄へ伝わり体を動かす命令信号を完全にキャンセルし、かわりにこの世界の体を動かす信号へと変換する. ここでどれほど派手に手を振り回そうと、現実世界で自室のベッドに横たわっている俺の本物の腕はぴくりとも動かず、ゆえに机の角にぶつけてアザを作ったりせずに済む.

To realise the FullDive environment, the NerveGear completely cancels the command signals for moving our bodies that our brain sends down our spinal cord and, in exchange, converts them to signals needed to move our bodies in this world. So however wildly we swing our arm about here, the arm of my real body, lying on my bed right now, wouldn't move a bit, ensuring that I wouldn't run into the corner of my table and bruise myself.

I reused the fan translation, accounting for some translation errors. The Yen Press version is a bit different, since they change "body" to "limbs" among other changes. Anyway, the problem is that the fan translation wasn't really accurate, since it omitted the 体を動かす part. The raw is only referring to signals for body movement. It doesn't mention the autonomic nervous system. Though I wonder why the medulla oblongata part is omitted in both the fan translation and Yen Press version. Could a later reprint have changed that part?

On a side note, the heart doesn't really need impulses from the brain to work. Heart beats are generated by the sinuatrial node in the heart itself. The brain is only needed to reduce or increase the heart beat rate via sympathetic or parasympathetic stimulation of the sinuatrial node.