Time Trial / Time Trialling / TT

It all seems moot since gas flow isn't restrictive on aerobic performance anyway, it's not like an engine where a judicious application of the porting tool will gain you a bunch of extra horses.

Would trying a 12t sprocket be too big a jump to 92"?

If you already have a 12T sprocket, try it and see what happens. If you don't, then going bigger on the chainring is the way to go, it will be smoother and more efficient.

I don't have a 12t, but it's only a fiver, whereas a new chainring is £15. Also need to resolve the flipping-the-rear-wheel-to-give-65"-for-everyday-use-/-chain-length conundrum.

Get a bigger chainring for sure, 48 would pair nicely with a 14t for racing and a 19t for daily riding.

[prepares to be exposed as an idiot]

My logic says the more oxygen you can flow in and out the more your body can use it up.

You suck up some air, all the oxygen gets sent around your body, you puff the air out again without as much oxygen in it ready for delicious new oxygeny air. The greater the flow the quicker you can inhale and exhale the oxygen.

No?

puts down Dremel

I wish I'd read this 5min ago!

The rate limit is your body's ability to use it though, not suck it in.
You're already sucking in more than it can use, ergo, making the holes bigger ain't gonna do jack.

K. So why do I get all mouth-breathy and panty when I try hard?

Response to increased need for oxygen? You need more oxygen when exercising so you breath faster/deeper. Having a bigger mouth doesn't mean your lungs can use all that you breathe in, nor does it mean your blood can carry more oxygen from your lungs to your muscles.

http://www.revolutionpersonaltraining.com.au/blog/why-do-we-puff-and-pant-during-exercise/

Possibly because you panic. Your body doesn't know how long or hard the effort is going to be, because large predatory felines are unpredictable. You can take voluntary control of your breathing, but at TT levels of effort that's still going to be breathing pretty hard and using the mouth - you should be able to shout your number to the timekeeper, but not say "I say, my good fellow, I have the number one hundred and nineteen pinned to my shorts"

And yet I always have enough oxygen free to swear like a trooper when I sprint to the wrong finish line... #secondlung

K.

Any thoughts on Obree's belief that warm air inhaled through the nose is bestest? Does the body deal with it more efficiently somehow?

Oh good one. They're close enough chain-length wise and I think I already have a 19t. 48t ring it is!

Any thoughts on Obree's belief that warm air inhaled through the nose is bestest? Does the body deal with it more efficiently somehow?

Maybe he has cold triggered asthma. I used to suffer terribly from that in early season TTs until I got on the right doping programme. Cold dry air can certainly cause enough bronchoconstriction in susceptible subjects to limit aerobic performance.

Cold dry air

Doesn't matter whether it's cycling, football or cross-country paperchase that the PE sadists made us do as a kid, I always dislike inhaling large amounts of sharp cold nasty air whilst setting off, it seems to go straight down my pipes and into my stomach making me feel nauseous.

I think the constraint is not how much oxygen you can get in in each breath, but the CO2 you can remove.

Using more lung means more exhalation of CO2 perhaps?

Obree uses a staggered breath pattern including one big and deliberately controlled exhalation (to force empty the depths of the lungs I think). He also eats his deserts before his mains for marginal gainz.

#funfact
#badscience

I hear he mainly advocates sardines on toast with red sauce.

At intensities above tempo I breath through my mouth so not an issue. My nose is too restrictive. I don't see how nose vs. mouth can make much difference to air temp but who knows unless it's tested.

http://www.innerbody.com/anatomy/respiratory

At high intensity though? Surely the air doesn't have enough time to be warmed? Filtered I can agree with but warmed I doubt.

Obviously ΔT will be smaller at higher flow rates, but you're still going to get more warming through the nasal cavity than you will through the mouth.

Yeah but my argument is that the 'more' makes no actual difference though.

Anyway, nose breathers >>>

my argument is that the 'more' makes no actual difference though

I'm not saying it's relevant to testers, just that it's a fact of anatomy.