Originally posted by: scootermaster
As far as doing the Valsalva correctly, like I said, I take a [relatively shallow] breath, hold it, tighten my abs, ass and then squat. When I'm on my way out, I foribly blow it out about 2/3 to 3/4 of the way up until I'm back at the top. Is there more to it than that?
The idea of the VM is to fill your torso with a lot of air and then pressurize it. This gives you larger, tighter, and more rigid core, which in turn lets you lift more weight and keeps your back safe. So, taking a "relatively shallow" breath isn't really what you're looking for. Instead, you want to take a big breath and make sure that it's getting onto your core. If your stomach expands when you breath in, you are doing it right; if your shoulders rise, you are doing it wrong. General procedure I follow:
1. Put your back into full extension ("chest up" or whatever cue you need). In fact, when first practicing the VM, you can even
slightly hyperextend the back (see step 3 for why).
2. Suck a big breath into your stomach.
3. Close your glottis (throat) and breath out against it. At the same time, brace your abs very hard. You should feel your whole body become very pressurized and your core become extremely tight. Moreover, bracing your abs will straighten your back slightly, so if it was hyperextended before, it's in a neutral arch now.
4. While still holding your breath and keeping your core very tight, begin your lift.
5. Allow your body to naturally make adjustments from here on out. For example, during o-lifts, you'll probably release a bunch of air (with a hissing noise) during the recovery. During the squat, you'll probably start breathing out half way out of the hole. Don't force any of these consciously: your body will adjust the pressure as necessary.
Note, all the above steps should take very little time. You don't want to be standing around while holding your breath: immediately after the air is in and your core is tight, start your lift. As soon as a rep is done, breathe as much as you need to prepare for the next rep.