Health: No guts, no glory
By Nick Morgan | Monday, January 19, 2009 4.00pm
A huge variety of energy products are available, so you need to experiment to find the right one for you Bikeradar
Everyone knows that to perform well you need to train your cardiovascular system, your muscles and your mind. Well it’s just as important – and just as possible – to train your stomach too.
Riding faster, further and fitter means more fuel, but you need to train your stomach to deal with the extra load. For most, riding for longer than an hour requires ﬂuid to stave off dehydration, and carbohydrates to maintain energy levels.
Sports drinks are handy in this regard because they’re designed to accomplish both. The problem is at race pace it’s hard to stomach the amount of sports drink you need, with a sloshing stomach, nausea and taste fatigue a common problem.
Studies show this is due to the slowing of gastric emptying during high intensity exercise – the process by which food and drink exits the stomach into the small intestine where it can be absorbed into the bloodstream and carried to the muscles to provide energy.
Armed with this knowledge, you need to decide on your priorities. Essentially this boils down to: do you need to take on a lot of ﬂuids, or carbs, or both?
Whichever you choose, you need to do so when gastric emptying is at its worst. That means mimicking race pace, or even faster.
For riders who sweat heavily, hydration is a priority and need to drink enough to ensure a bodyweight reduction of no more than 2% after a ride.
“It’s a good idea to have a large drink straight before exercise as volume in the stomach stimulates gastric emptying,” says Dr Glenn McConell of MelbourneUniversity. “Try 6-8ml/kg immediately before exercise (so you don’t stimulate urination) and then 2-3ml/kg every 15 minutes from then on.”
But, if you’re a light sweater, taking on masses of ﬂuid may actually be a bad thing as it’ll simply provide extra ballast.
“The time lost through a modest level of dehydration may be less than the time taken to constantly reach for a bottle and top up,” says LoughboroughUniversity exercise physiologist Dr Susan Shirreffs.
In terms of carbs, you need to look at whether you have a tendency to bonk at the end of rides. If so, you’re probably not taking on enough, so try supplementing your sports drink with gels or energy bars.
Of course, working out your ideal plan doesn’t necessarily make things easier. If you’re a heavy sweater and require lots of carbs, you’ll be putting an awful lot into your stomach, which may feel uncomfortable at ﬁrst. This is where a bit of trial and error comes in.
The sport drink solution
Most sports drinks contain 5-7% carbohydrate and are ‘isotonic’, meaning the drink matches the osmolality of bodily ﬂuids closely allowing for easy absorption. But you may still want to experiment.
A team at BirminghamUniversity found a mixed glucose/fructose drink left cyclists with less of a 'full stomach' than a pure glucose drink. Similarly, at LiverpoolJohnMooresUniversity, a 15% maltodextrin solution improved performance in cyclists compared to a 5% glucose drink without any increase in stomach issues.
Another reason to experiment is taste fatigue. Sports drinks are quite sickly sweet and consuming the same drink all through a long ride causes the taste to stick in the mouth, exacerbating feelings of nausea and making riders reluctant to drink further. “Taking two bottles of identical drink in different ﬂavours is one way to get around it,” says Shirreffs.
“Small, regular sips during sessions faster than race pace will increase your ability to consume and digest the ﬂuids, calories and electrolytes in your drink of choice,” says Dr Misner.
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