With the Unreasonable East 200 miler ( https://unreasonableeast200miler.com.au/ ) less than 10 days away its time to start to think about carbo loading albeit for an ultra you probably don’t need to with the amount of food available at aid stations but for all your short distance runners, less than a marathon, carboloading is important.  I’ve written about carboloading a lot over the years as it’s one of my favourite subjects. Three days of eating 10g of carbs for every kilo of body weight, how good is that ? Runners normally love their food and for three days you can actually indulge albeit with a caveat of sticking to carbs as much as possible while avoiding too much fat and sugar of course.

I personally only really carboload for a marathon , anything shorter it’s just about a proper taper and watching your diet on the week of the race. With shorter races racing weight also becomes a challenge and you need to be mindful of obtaining the right balance between eating too much and putting on an extra kilo or two that you then need to run with or not eating enough , to drop weight, and then having no energy for the event.  With experience you generally find out what works for you and each individual is different. In the days before carbon-plated running shoes, can you remember that far back?, we all use to seek out the lightest running shoes while putting on 1-2 kilos of extra weight carboloading poorly.  Runners and logic, not generally bed fellows ?

Are we carboloading all wrong and do we really care ?

The Thursday before a marathon is when traditionally you start to gorge on carbohydrates to carbo-load for the big day on Sunday.  I use the old tried and tested 10g of carbohydrates for every kilogram of weight. For me that is 700g of carbohydrates for three days. It is a challenge and one I reckon 75% of all runners fail to meet it. They’ll make an effort of course but either not hit the required amount of carbs or fail to hydrate properly. One thing I guarantee is you will feel ‘bloated’ and ‘heavy’ after a good carbo-load but this is mainly liquid and on the day the benefit out weighs weight issues.

Is there a better way than a 3 day food feast though ? As runners it normally goes against the grain by eating so much and exercising so little. (I’m assuming you are tapering by now ?) The guilty feeling as you eat a muffin for a third day on the trot (I must admit to never having this feeling but I’ve been told some runners do , funny that ?) and stagger around with 2-3 litres of water sloshing about in your belly.

I’ve read that you can ignore the carbo-loading if you take carbs on the day in the form of Gu’s or shotz, or this at least negates the whole process. I’m not convinced but even Matt Fitzgerald has been quoted buying into this theory. Matt wrote an interesting article below on different methods of carbo-loading but I’m not ready to give up my muffin feeding frenzy just yet, so Matt,  in this case,  I’m staying traditional.!

 

 

The practice of carbo-loading dates back to the late 1960s. The first carbo-loading protocol was developed by a Swedish physiologist named Gunvar Ahlborg after he discovered a positive relationship between the amount of glycogen (carbs stored in the muscles and liver) in the body and endurance performance. Scientists and runners had already known for some time that eating a high-carbohydrate diet in the days preceding a long race enhances performance, but no one knew exactly why until Ahlborg’s team zeroed in on the glycogen connection.

Subsequently, Ahlborg discovered that the muscles and liver are able to store above-normal amounts of glycogen when high levels of carbohydrate consumption are preceded by severe glycogen depletion. The most obvious way to deplete the muscles of glycogen is to eat extremely small amounts of carbohydrate. A second way is to engage in exhaustive exercise. The stress of severe glycogen depletion triggers an adaptive response by which the body reduces the amount of dietary carbohydrate that it converts to fat and stores, and increases the amount of carbohydrate that it stores in the liver and muscles as glycogen. Ahlborg referred to this phenomenon as glycogen supercompensation.

Armed with this knowledge, he was able to create a more sophisticated carbo-loading protocol than the primitive existing method, which was, more or less, eating a big bowl of spaghetti.

Ahlborg came up with a seven-day carbo-loading plan in which an exhaustive bout of exercise was followed by three or four days of extremely low carbohydrate intake (10 percent of total calories) and then three or four days of extremely high carbohydrate intake (90 percent of total calories). Trained athletes who used this protocol in an experiment were able to nearly double their glycogen stores and exhibited significantly greater endurance in exercise lasting longer than 90 minutes.

After these results were published, endurance athletes across the globe began to use Ahlborg’s carbo-loading plan prior to events anticipated to last 90 minutes or longer. While it worked admirably, it had its share of drawbacks. First of all, many athletes weren’t keen on performing an exhaustive workout just a week before a big race, as the plan required.

Second, maintaining a 10 percent carbohydrate diet for three or four days carried some nasty consequences including lethargy, cravings, irritability, lack of concentration, and increased susceptibility to illness. Many runners and other athletes found it just wasn’t worth it.

Fortunately, later research showed that you can increase glycogen storage significantly without first depleting it. A newer carbo-loading protocol based on this research calls for athletes to eat a normal diet of 55 to 60 percent carbohydrate until three days before racing, and then switch to a 70 percent carbohydrate diet for the final three days, plus race morning.

As for exercise, this tamer carbo-loading method suggests one last longer workout (but not an exhaustive workout) done a week from race day followed by increasingly shorter workouts throughout race week. It’s simple, it’s non-excruciating, and it works. Admittedly, some scientists and athletes still swear that the Ahlborg protocol is more effective, but if it is, the difference is slight and probably not worth the suffering and inherent risks.

Note that you should increase your carbohydrate intake not by increasing your total caloric intake, but rather by reducing fat and protein intake in an amount that equals or slightly exceeds the amount of carbohydrate you add. Combining less training with more total calories could result in last-minute weight gain that will only slow you down. Be aware, too, that for every gram of carbohydrate the body stores, it also stores 3 to 5 grams of water, which leads many athletes to feel bloated by the end of a three-day loading period. The water weight will be long gone by the time you finish your race, however.

A friendlier carbo-loading strategy was devised in 2002 by scientists at the University of Western Australia. It combines depletion and loading and condenses them into a one-day time frame. The creators of this innovative protocol recognized that a single, short workout performed at extremely high intensity creates a powerful demand for glycogen storage in both the slow-twitch and fast-twitch fibers of the muscles.

The researchers hypothesized that following such a workout with heavy carbohydrate intake could result in a high level of glycogen supercompensation without a lot of fuss. In an experiment, the researchers asked athletes to perform a short-duration, high-intensity workout consisting of two and a half minutes at 130 percent of VO2max (about one-mile race pace) followed by a 30-second sprint. During the next 24 hours, the athletes consumed 12 grams of carbohydrate per kilogram of lean muscle mass. This resulted in a 90 percent increase in muscle glycogen storage.

Runners have cause to be very pleased by these findings. Doing just a few minutes of high-intensity exercise the day before a competition will not sabotage tomorrow’s performance, yet it will suffice to stimulate the desirable carbohydrate “sponging” effect that was sought in the original Ahlborg protocol. This allows the athlete to maintain a normal diet right up until the day before competition and then load in the final 24 hours.

The Western Australia carbo-loading strategy works best if preceded by a proper taper — that is, by several days of reduced training whose purpose is to render your body rested, regenerated, and race-ready. In fact, several days of reduced training combined with your normal diet will substantially increase your glycogen storage level even before the final day’s workout and carbohydrate binge. When you exercise vigorously almost every day, your body never gets a chance to fully replenish its glycogen stores before the next workout reduces them again. Only after 48 hours of very light training or complete rest are your glycogen levels fully compensated. Then the Western Australia carbo-loading regimen can be used to achieve glycogen supercompensation.

An even newer carbo-loading protocol calls for athletes to eat a normal diet of 55 to 60 percent carbohydrate until three days before racing, and then switch to a 70 percent carbohydrate diet for the final three days, plus race morning. As for exercise, this friendliest carbo-loading method suggests one last longer workout (but not an exhaustive workout) done a week from race day followed by increasingly shorter workouts throughout race week.

Having said all of this, I would like to note finally that carbo-loading in general has been shown to enhance race performance only when athletes consume little or no carbohydrate during the race itself. If you do use a sports drink or sports gels to fuel your race effort — as you should — prior carbo-loading probably will have no effect. But it doesn’t hurt to do it anyway, as insurance.

Carboloading, pass me a muffin and no one gets hurt.

There are times when being a runner can really be an excuse to eat great ‘tukka’ and carboloading is one of those times. Three days before your goal race, which should be a marathon distance or more (so don’t think this applies to 5k races, sorry !) , you try and eat 10g of carbohydrates for every 1kg of weight, i.e. me being 70kg , I need to eat 700g of carbohydrates for 3 days pre-marathon. It is actually quite hard to get this right unfortunately. A lot of runners just end up eating junk assuming all food is good food this close to the race or don’t hydrate enough. (You need to properly hydrated for the carboloading to work properly)

So what does a 700g day look like. Breakfast,  weetbix and honey with orange juice. Brunch, 2 slices of toast with honey and another OJ. Lunch, pasta with chicken and some yoghurt. Maybe another round of toast pre-dinner of more pasta. Add in another OJ somewhere and a late night yoghurt or toasted muffin and you’re pretty close. Best thing is to google ‘carboloading’ and you’ll get the general idea. What did we do before ‘google’? Maybe I’ll google ‘what did we do before google’?

Also make sure you aim for high carbohydrate , low fat food; avoid the high fat food.

So carboloading, a good thing if done correctly and I’d say worth 4-5 minutes. C’mon,  what other sport gives you such a return just by eating. Gotta love running……

This article written by AIS Sports Nutrition is worth a read on the subject.

‘Carbohydrate loading’ is probably one of the most misunderstood terms in sports nutrition. People commonly think anyone involved in sport needs to ‘carb up’ and the way to do this is to eat ‘flat out’ in the days leading up to an event. Read on to get the facts on carbohydrate loading.

What is carbohydrate loading?

Carbohydrate loading is a strategy involving changes to training and nutrition that can maximise muscle glycogen (carbohydrate) stores prior to endurance competition.

The technique was originally developed in the late 1960’s and typically involved a 3-4 day ‘depletion phase’ involving 3-4 days of hard training plus a low carbohydrate diet. This depletion phase was thought to be necessary to stimulate the enzyme glycogen synthase. This was then followed immediately by a 3-4 day ‘loading phase’ involving rest combined with a high carbohydrate diet. The combination of the two phases was shown to boost muscle carbohydrate stores beyond their usual resting levels.

Ongoing research has allowed the method to be refined so that modern day carbohydrate loading is now more manageable for athletes. The depletion phase was demonstrated to be no longer necessary, which is a bonus for athletes as this phase was very difficult. Australian marathon runner, Steve Moneghetti has described the depletion phase as making him feel like “death warmed up”. Today, 1-4 days of exercise taper while following a high carbohydrate diet (7-12g/kg body weight) is sufficient to elevate muscle glycogen levels.

Does carbohydrate loading improve performance?

Muscle glycogen levels are normally in the range of 100-120 mmol/kg ww (wet weight). Carbohydrate loading enables muscle glycogen levels to be increased to around 150-200 mmol/kg ww. This extra supply of carbohydrate has been demonstrated to improve endurance exercise by allowing athletes to exercise at their optimal pace for a longer time. It is estimated that carbohydrate loading can improve performance over a set distance by 2-3%.

Who should carbohydrate load?

Anyone exercising continuously at a moderate to high intensity for 90 minutes or longer is likely to benefit from carbohydrate loading. Typically, sports such as cycling, marathon running, longer distance triathlon, cross-country skiing and endurance swimming benefit from carbohydrate loading. Shorter-term exercise is unlikely to benefit as the body’s usual carbohydrate stores are adequate. Carbohydrate loading is generally not practical to achieve in team sports where games are played every 3-4 days. Although it might be argued that players in football and AFL have heavy demands on their muscle fuel stores, it may not be possible to achieve a full carbohydrate loading protocol within the weekly schedule of training and games.

What does a high carbohydrate diet look like?

The following diet is suitable for a 70kg athlete aiming to carbohydrate load:

Breakfast
3 cups of low-fibre breakfast cereal with 11/2 cups of reduced fat milk
1 medium banana
250ml orange juice
Snack
toasted muffin with honey
500ml sports drink
Lunch
2 sandwiches (4 slices of bread) with filling as desired
200g tub of low-fat fruit yoghurt
375ml can of soft drink
Snack
banana smoothie made with low-fat milk, banana and honey
cereal bar
Dinner
1 cup of pasta sauce with 2 cups of cooked pasta
3 slices of garlic bread
2 glasses of cordial
Late Snack
toasted muffin and jam
500ml sports drink
This sample plan provides ~ 14,800 kJ, 630 g carbohydrate, 125 g protein and 60 g fat.

Are there any special considerations for females?

Most studies of glycogen storage have been conducted on male athletes. However, some studies suggest that females may be less responsive to carbohydrate loading, especially during the follicular phase of the menstrual cycle. This appears to be, at least partly, because they have difficulty consuming the larger amounts of carbohydrate required for a complete CHO load. Further research needs to be conducted specifically on females.

What are the common mistakes made when carbohydrate loading?

Research indicates that many athletes who attempt to carbohydrate load, fail to achieve their goal. Common mistakes include:

Carbohydrate loading requires an exercise taper. Athletes can find it difficult to back off training for 1-4 days before competition. Failing to rest will compromise carbohydrate loading.

Many athletes fail to eat enough carbohydrate. It seems athletes don’t have a good understanding of the amount of food required to carbohydrate load. Working with a sports dietitian or using a carbohydrate counter can be useful.
In order to consume the necessary amount of carbohydrate, it is necessary to cut back on fibre and make use of compact sources of carbohydrate such as sugar, cordial, soft drink, sports drink, jam, honey, jelly and tinned fruit. Athletes who include too many high fibre foods in their carbohydrate loading menu may suffer stomach upset or find the food too bulky to consume.

Carbohydrate loading will most likely cause body mass to increase by approximately 2kg. This extra weight is due to extra muscle glycogen and water. For some athletes, a fear of weight gain may prevent them from carbohydrate loading adequately.

Athletes commonly use carbohydrate loading as an excuse to eat everything and anything in sight. Consuming too many high fat foods will make it difficult to consume sufficient carbohydrate. It may also result in gain of body fat. It is important to stick to high-carbohydrate, low-fat foods while carbohydrate loading.