D.M. Procida said:In the last year or so it has become inescapably obvious to me that I
have developed a small but unattractive pot-belly (I look a bit like,
say, a stick with a pot-belly on it). For the first time since I was
about 19 I have clothes which used to fit me but don't.
I'd like to get rid of this thing, but I don't want to start watching my
diet or taking special exercise. What I would like to know is what style
of cycling will help me achieve this fastest - should I get on the bike,
and pedal as hard and fast as I can until I can't manage any longer, or
go for leisurely 20km rides, or drag myself up the steepest hills I can
find, or what?
Daniele
Most of this is culled from "The Long Distance Cyclist's Handbook", but
ties in with what I've seen from many other sources:
If you go for short duration, high intensity exercise, you are running
mainly on glycogen (short term, easily available fuel, stored in
muscles and the liver).
If you're going really hard, your body can't provide fuel to your
muscles as fast as you're burning it off, so you can keep going until
the glycogen is exhausted and you fall over with the bonk.
Alternatively, your heart, lungs and circulatory system can't keep up
with the demand for oxygen, and you fall over gasping for breath.
After you stop, you replenish the glycogen from the food you are
digesting (hence eating somthin sugary asap if you begin to bonk), and
to a lesser extent from fat stores.
At a slower pace, you start off burning glycogen as before.
As the level of available glycogen drops, you body begins to convert
stored fat reserves into fuel for the muscles, and you begin to burn
off your belly - yay! Keeping the intensity lower means that your body
can keep your muscles supplied with fuel and oxygen a rate suficently
high that you don't go into bonk or red-faced, gasping collapse.
The change over from running on pure glycogen to beginging to
metabolise fat is supposed to kick in after 45mins to 1hour during
mode exercise.
FWIW, I've seen it suggested several times that even low levels of
caffine (2 or so cups of "real" coffee before setting out) can cause
the metabolising of the fat to kick in sooner.
So broadly speaking, longer rides and lower intensity rates are best
for pure weight loss. The intensity is often measured as as % of peak
heart rate, but that's a PITA to measure and check on constantly. I
had a HRM with upper and lower limits, but found the thing sucked all
the fun out of cycling, so I gave it the boot.
If you keep it so you're face isn't red and you can still hold a
conversation without gasping constantly, that's probably about right.
In terms of diet, I didn't do anything special beyond eating breakfast
every day ( I would often have skipped it before), and cutting out
snacking outside the three-meals-a-day.
Following this advice got me down from 15.5 st. in January of this year
to 13.5 st at the begining of May, most of the weight being lost from
my beer-belly.
hth,
bookieb.