Category: Nutrition

As a sports nutritionist, endurance & physiology expert with a deep understanding of how the body responds to energy and hydration requirements during endurance events, especially Comrades Marathon where I have had the opportunity to work with hundreds of amateur and professional athletes over the past decade, I know how crucial nutrition and training is. I have witnessed first-hand how it’s played the biggest role in the collapse and eventual breakdown of even the best of runners when they get it wrong.

Comrades 2018 is now over. One of the largest fields in the history of the race left some elated with their results and others wondering how the wheels fell off so quickly. I decided to write a blog to try to clarify and explain several pitfalls and possibly assist you in understanding where you could have gone wrong or how you can improve for the next year.

Let’s look at the Comrades Marathon route. A down run with plenty of mountains in the first half only to much later dip rapidly downhill to the coastal plain where the race profile is tamer than what was experienced in the first 50km’s.

Pacing
The first aspect I always look at is pacing in the first half of the race. I was told by one athlete prior to Comrades that in the first half he was going to run quite a bit faster than his goal pace while his legs were fresh and then hang on for the second half. I told him that will never happen. Those awesome seconds he banked in the first half will be minutes if not hours in the second and any experienced Comrades runner knows that the dreaded down needs to be run conservatively in the first half.

Temperature Variance
One thing any down run Comrades runner expects is to freeze at the start and suffer the heat at the end. This year it was cold at the start not as cold as I have felt in previous years but cold enough to lower the sweat rates of the body and as the day progressed the temperature did not climb that high it stayed cool on route with a gentle cool wind blowing most of the day. Probably the lower of temperatures I have experienced on race route in the past ten years. Why is this crucial? Quite simple temperature plays a direct role in how the body will respond to hydration requirements to keep it cool. In hot temperatures there is direct response to heat where heart rate is elevated, and more fluid is lost in the form of sweat to aid the natural cooling system of the body. The hotter it is the higher the heart will perform at a given pace. In cooler conditions the heart rate will be lower, so perceived effort is lower allowing an athlete to sometimes push harder if he is using heart rate as a measure of effort. This is mistake number one and ties directly into the pacing above. I will use a simple example below to demonstrate what I mean.

Below are two running sessions I did with a sub 6hr Comrades runner in the beginning of the year while he was building for the big day.

The Strava segments below are quite straight forward. Both are controlled runs. The one on the left was a 25km run 221m of elevation at an average pace of 4:22. The average heart rate for this run was 163 BPM (Beats Per Minute) as shown in the heart rate chart below.  On the right side is a longer route of 30km with much more elevation and you will notice the pace for the 30km run was faster than that of the 25km run. However, the interesting part is that the slower paced shorter run with less elevation had a much higher average heart rate.  A difference of 8 BPM which is quite significant. Someone said its because you were fitter in the second run, but not, as these were a week apart and fitness doesn’t change that rapidly. The main reason is that the average temperature in the first run was hotter than in the second run. Temperature increase equates to higher heart rate, higher perceived effort which spins into the slower pace.

 

The above is purely a graphical representation of how at Comrades Marathon if you did feel like you were in control of the pace due to effort you might have gone slightly faster under cooler conditions without realising it as it was cooler on the day.  If this is the case and your muscles were not conditioned for the faster pace over time I can with absolute certainty say the muscles were going to fatigue earlier on and your race would be a sufferfest from that point on. You need to understand how temperature affects the body under stress and adjust pace accordingly this could be one reason for having a bad day out.

Pre-Race Fuelling
I have witnessed the most horrific fuelling strategies on race day and seen how sick people get on the course. The interesting thing is it all starts with the pre-race meal on the morning of the race. Firstly, the meal needs to be tried and tested and many runners suddenly do a switch on race day which can lead to major discomfort later.

Whether a low carb or high carb eater I always advocate a meal of around 1-4grams of carbohydrate intake per a kilogram of body weight around 1-4hrs before an event.  The lower end if you are a lower carb eater and only if you have tried and tested it you can go to the upper end but a higher intake closer to the 4hr mark and lower intake closer to the event. Secondly, we are talking very easily digestible carbohydrates, low in fibre so as not to irritate the bowels. I advocate protein intake as well for long events and would look at a 3:1 or 4:1 carb to protein intake and if you do consume protein then easily digestible lean protein (low to no fat) nothing heavy that would sit and create discomfort. I am not a fan of high fat intake prior to an event, it takes a long time to break down and it can lead to the onset of GI (gastric intestinal) distress during the race. At 2am each year I join the masses in the hotel breakfast room and watch with curious intent at what each person is consuming pre-race. I don’t look at it emotionally I look at it from a performance perspective. Very often I can see by what an athlete consumes whether they will have a bad day or good day out as that can be the first mistake they make on race morning. If you had a rough stomach day think back to what you ate on race morning. It might have been something simple like oats which you might have had before but the question then is which oats did they use? How did the cook it? In water or milk? If milk which milk low or high fat? How long before was it prepared? All these factors can influence a 90km trot. Best is to be prepared.

Race Fuelling
An ultra-marathon is tough. It’s tough on the body and tough on the mind. It’s a long journey which requires optimal fuelling. On Comrades day pace and preference will determine fuel intake. The elite athletes I work with will have liquid feeds on route as their airways need to remain open at all times to allow maximum oxygen uptake to support their efforts. The slower back packers can easily afford to chew or bite on food solids and often walks through water tables allow for this.

The two biggest mistakes in fuelling on race day are over fuelling and nutrient timing.  Let’s look at over fuelling first. Taking in too many carbohydrates during an endurance event can certainly lead to digestive discomfort, but it can also lead to nausea and dizziness. Finally cramping can be triggered by a glucose overload in that it can cause an overly hypertonic environment in the digestive tracts and mitigate optimal fluid uptake from taking place leaving the muscles depleted and in a very unhappy state. How many grams of carbohydrates did you consume per an hour on race day? I feel anything between 30-60grams is more than enough for a runner. Some athletes do go higher and anything on the high end will have to be tested way before race day to see how the digestive system copes with the volume of carbs consumed. It’s not about how many carbs you stick in your mouth but more about what the body is capable of absorbing and processing for use.  How do you prevent over consumption and still maintain a steady flow of energy and remain comfortable? It’s quite simple it’s about nutrient timing and it’s called drip feeding. Split the feeds into smaller more frequent meals over time to allow for the already stressed digestive system to absorb and use the intake without causing any havoc. Over and above that you will be shortening the peaks and troughs of the blood sugar rise and fall, and this will allow for a more balanced energy effect. So, when consuming a gel its better to go with a third to half of a gel every 20-30min as opposed to one gel every 45 minutes. The next statement I am going to make might upset a few runners, but a gel is not a suitable feed for a slow runner over a long period of time. We hardly feed the elite athletes gels on route, they prefer a more balanced approach to fuelling and try to combine the hydration and fuelling together by using various prepared solutions on route which start off more hypertonic in nature when cold and then slowly evolve to isotonic and hypotonic solutions when the temperatures climb later in the event. Options on route are a must as with weather conditions you never know what to expect over time. Comrades marathon isn’t primarily a glycogen fuelled effort but more of a fat tank fuelled effort and so I advocate fuelling accordingly to maximize fat oxidation. If you are not sure about the human fuel tanks used during sports performance, then check out my video on Getting into the Zone where I explain how they work.

Protein Intake
Did you take in protein on the Comrades route? I can promise you if you didn’t then the fatigue would have set in a earlier than an athlete that did take it in. In fact, all the front runner elite athletes we fed on route were mainly fuelled with a protein shake I made up specifically for them, including Bongmusa Mthembu the winner on the day. I used 32Gi Recover 2 scoops to 200ml of fluid with 95mg of caffeine in the form of TrueStart Coffee mixed into it. Why did I do that? Simple I want the runners to get in around 5-6grams of protein minimum per an hour with the carbohydrates in the mix. (check out my video on 32Gi Recover discussing the need for it during an event) Nutrient delivery is optimal, and the intake of protein can lead to the delayed onset of muscle fatigue by delaying muscle protein catabolization as well as keep any hunger at bay. On average an elite athletes will take in around 6-12grams of protein per an hour and around 20 – 50grams of carbohydrates and anywhere from 95-120mg of caffeine. What is interesting about this number is it’s not high at all and yet it’s perfectly suited to the winning performances we see every year. Most slower runners consume way more. The slower amateur athletes I did advise to consume protein on route at least at the 30-40km mark and then 50-60km mark all gave very positive feedback as to how it was a game changer for them on the day and how much they enjoyed the feeling of it. It certainly made a difference on the day.

Hydration
Hydration to me is the more crucial aspect of Comrades Marathon in that you have sufficient fuel in your natural fuel tanks in the form of glycogen and fat to get you to the finish line and hydration will play an even more important role on the day. It is not possible to replenish all the fluid lost in the form of sweat during exercise, but we aim for an 80% replenishment. To do this water consumed on its own will not achieve this as it has a slower absorption rate than a mineral or isotonic carbohydrate drink. When I feed elite athletes, I do not allow pure water consumption unless it’s with some sort of a carbohydrate or mineral rich product which will help pull the fluid out of the digestive tracts into the system. I prefer a hypotonic drink as a means of hydration as it is designed to maximize fluid absorption. Drinking water on its own will sit in the stomach and take its time to get out if there is nothing assisting it. This can lead not just to stomach discomfort and a washing machine effect with fluid sloshing around inside, but it can also place strain on the kidneys and could ultimately be a trigger of hyponatremia (overhydration) which can lead to illness and in severe cases death. In our case we use 32Gi Hydrate for seconding which is a pure electrolyte solution with a decent sodium content to ensure rapid fluid absorption. (Check out my blog on Hydration to get more in-depth understanding)

Caffeine
Did you take in caffeine on race day? It can be in any form and many forget that even coke contains caffeine. So the low down on caffeine is such. Firstly it needs to be tried and tested, it is acidic and if you don’t tolerate it well it can cause digestive issues. Secondly caffeine is one of those stimulants that once consumed will metabolize over an approximate time of 60 minutes meaning that once you get the rise you will get the fall. If you start taking it in you need to keep taking it in prior to the 60 minute life, otherwise you will hit a downer. When taking in caffeine understand once you start you need to keep going. Some runners will take much later in the race when they need it and there are those that take all the way through. If you did consume caffeine early on but did not continue with it you might have felt the dreaded crash.

Every year on Comrades route nausea and cramps takes its toll on the masses of runners that haven’t practised proper fuelling strategies and have just read the packaging directions on a product. The problem is the packaging on a product does not know you are running a 90km run over so many hours and so it is of prime importance to ensure you have planned, tried and tested your fuelling strategies under various conditions before you get to race day to ensure you don’t land up in the pitfalls of the many that do.

If Comrades was a good day out for you that’s great and maybe you had everything properly planned or you did fall victim to some of the issues on race day and managed to overcome them. Possibly you can do much better next year with a better prepared and properly planned strategy to tackle the up run. If you were one of those that had a miserable day out I can pretty much bet, you were under prepared from a training and or nutrition perspective and this is your opportunity to think very carefully about how you can better tackle an ultra-event the next time you do.

In the meantime well done to all the finishers, recover well and yes this does require proper nutrition as well 😉. Get proper rest and begin an active recovery program when ready and make sure you plan better for next time.

All the best

M

Mark Wolff is a certified sports nutritionist and an endurance nutrition and physiology expert with over 20 years experience. An endurance multi-sport athlete with a triathlon, mountain biking and weight lifting background, he works extensively with professional and amateur athletes in a variety of sports disciplines as well as those just wanting to change their lifestyles. He firmly believes that a person can only reach their full potential when their health and nutrition is down packed. Mark’s focus on nutrition and physiology is not just on training and racing, but he places major emphasis on recovery, immune system health, emotional stability, stress management and performance. Mark is co-founder of 32Gi a sports nutrition company, focused mainly on health and endurance nutrition.

 

 

In the previous blog we discussed race week nutrition and hydration. In this final blog I am going to focus on the 48hrs up until race day including race day itself. If you missed the previous blogs then just click here to access

For me personally the two days leading into any race requires planning in order to ensure I limit any stresses and can completely relax and focus on the big day.  I have a plan for sleeping, eating, race kit & preparation so that the last days before the race I can completely relax.

As mentioned in the previous blogs my menu for the days leading up to the event is completely planned. Wherever I have travelled in the world to race, I know exactly what to eat, how to hydrate and remove all the pressures associated with last minute race planning because its already been done. If you fail to prepare then you can prepare to fail. No need to cram everything into the last minute and make mistakes.

48 HOURS BEFORE RACE DAY
The 48hrs prior to your race try to give us much focus to sleep, hydration and nutrition as possible. Keep the feet up nicely and allow them the much needed rest before tackling the gruelling event. If you do go to expo in the 48hrs before the event then please try not to spend too much time there. I stand at expo’s a lot and watching runners shopping for hours on end is just madness so close to a race. Limit your time on the legs or you will definitely land up fatiguing them. Expos are also famous for unhealthy fast food and beer drinking. Don’t get caught up in this. The amount of food passing through the kitchens each hour and the conditions in which they are managed is less than stellar before a major event. Take with water to the expo so when you are queueing you are hydrating as you never know how long you might land up being in the line for an potentially being exposed to the sun. As for the beer, its dehydrating you for sure and being in a dehydrated state before an event is not the place you want to be. Take with some snacks as well so that you can keep your stores nicely topped up at race registration.

Eating or drinking something that doesn’t sit well with the body can cause digestive issues, illness and dehydration and it can lead to a really bad day out. For example if you are lactose intolerant do not compromise and consume any dairy steer clear of it. In many athletes red meat sits heavily in the stomach, so if this is the case with you avoid heavy proteins and rather eat lean proteins or plant based proteins. Finally do not try any new foods before the event stick to what you know and what agrees with you. Do not overdo it with stimulants especially caffeinated drinks such as coffee as they do have a diuretic effect and can also lead to sleep disturbance. You need to get a few good night’s sleep before the race, so you don’t want to impact your sleep by taking any stimulants which would impact it at night.

Some athletes deplete carbohydrate stores closer to a race and then slowly build up that carbohydrate intake to maximize their glycogen stores. Don’t try this if you’ve never tried it before. There is no reason to overeat carbohydrates in those hours before an event because your glycogen stores will be topped up with reduced volume in training and it’s not going to make a major difference on race day. Overdoing it will just lead to weight gain and discomfort.

24 HOURS BEFORE RACE DAY
Nerves are beginning the months of preparation are now coming to the big test. Friday night is the night you want to get a really good nights sleep and if you can extend it the following morning that’s absolutely fine. You wont be sleeping much the night before so get in as much sleep as you can the day before.
Plan to eat nice consistent meals the day prior to the event. You can up the carbohydrate intake slightly but keep the eating controlled and manageable do not overeat. Hydrate consistently and try to avoid consuming anything that has a diuretic effect.

Many athletes tend to eat a large meal the night before the race in order to really top up glycogen stores. I feel this is not necessary at all and can in actual fact be more damaging. Consuming a large meal the night before race day will set off some digestive discomfort and will impact your ability to sleep properly. Sleep is more important than overloading the digestive system. As for hydration do not drink a lot before sleep that night. Hydration should be done through the day. Drinking too much before you go to bed is just going to impact your sleep even more by forcing you to run up and down to the bathroom. If you want a slightly larger carbohydrate meal before the event then do it at lunch time, but keep the night time meal nice and small. I also would not advocate eating out the night before. I have seen many athletes eat hotel room service or take outs only to succumb to the ills of a bad stomach or nausea the next day. Plan your meal properly.

RACE DAY

THE PRE-RACE MEAL
A lot of athletes tend to not eat before a big race, but it is the most crucial meal of the day.

What you take in on the morning of race day is going to play a very important role in fuelling you during your race. I suggest eating a meal that will provide you stability and give you the energy requirements that you need during the event.

In looking for the most appropriate pre-race meal the food firstly needs to be something that you are used to and have eaten previously. Do not try anything new on race day. Generally, I advocate a slightly higher carbohydrate meal, unless you are a high fat low carb eater (banter). Depending on the kind of diet that you follow you need to try and keep it simple and healthy. The best time to eat would be at least a minimum of two hours before the event start so that you have enough time to allow the food to digest and the stomach to settle. However many get up very early to drive far to the start and in this case I would look at an additional 100 Calories for every additional hour you eating before the event.

Depending on your weight, a meal between 200-400 calories (depending on weight and time consumed) should be more than sufficient from an energy perspective at that time of the morning. If you are too close to the start time, then reduce the calorie intake accordingly to ensure that the digestive system maintains a level of comfort in the early part of the race.

If you eat breakfast early and its a smaller manageable meal then you can always take an easily digestible food on route with you to the start such as a banana and eat a little more before the event.

DO NOT skip your pre-race meal it is the most important meal of the day. I often get asked what good meal examples would be as a pre-race meal and this is how I would go about planning it.

 

1. Do not eat what doesn’t agree with you and what has not been tested previously.
2. Start with the carbohydrate content and keep it simple and easily digestible.
3. Ensure the carbohydrate selected doesn’t spike your blood sugar but provides some form of stability.
4. Keep the fibre as low as possible (high fibre can irritate the bowels)
5. Protein can assist in delaying onset of muscle fatigue in long endurance events and I would suggest adding in a little to your pre-race meal.
6. Fat can also be added but I would opt for the type of fat that provides more easily accessible energy, and, in this case, medium chain triglyceride’s are best.

 

Examples of a pre-race meals could be a gluten free rolled oats, nut butter and some banana or berries. You could eat some banana on low fibre bread or toast, sweet potato, rice or quinoa pudding or oatmeal, spelt or sorghum pancakes. Eggs on toast with a little avocado is also fine, it really depends on the kind of person you are, what kind of diet you follow and what you are used to consuming pre-exercise If following a low carb lifestyle, you can opt for a higher fat meal (the larger portion being medium chain fats) however, I would still advocate a stability carbohydrate before and keep the protein intake small.

Remember, what you eat before the race is going to help fuel you during the race and you need to start your ultra-distance event with topped-up fuel tanks.

THE CAFFEINE BENEFIT

Caffeine is a stimulant and it is beneficial in endurance sport. It has been shown to aid performance when consumed correctly. Caffeine provides mental focus and in any endurance sport this plays a crucial role in sports performance. It is recommended to consume 1-3mg/kg of bodyweight around 2-4hrs before an event. Coffee is not a good measure of caffeine unless it’s a coffee like TrueStart Coffee where you know exactly how much caffeine there is per a serving. Caffeine intake must be measured. It should also have been tried and tested in training to understand how the body responds.

When heading off to the event, make sure you do hydrate sufficiently, but do not over-hydrate because at that time of the morning it’s very cool and the last thing you want to do when the event starts is have that heavy stomach feeling and overloaded bladder forcing you to run to the toilet.

RACE FUELLING

Race day fuelling needs to be properly planned and you should have practised this in your training. If you haven’t, you have completely fallen short of preparing properly for the event because nutrition is a make or break.

You cannot just rely on the nutrition that’s on the course if you haven’t tried and tested it. The best way to fuel in an endurance event, specifically a Comrades Marathon is to make sure you separate your hydration and your energy requirements. Think about hydration in terms of what’s going to keep the body hydrated not about energy. Hydration has been spoken about extensively in the past and if you are not sure you can read my blog Simply Hydrate to get a more in-depth understanding.

As for energy requirements you need to know how much you’re going to be consuming in the form of grams of carbohydrates per an hour during the event to give you the optimal fuel to perform. A large portion of your energy requirements will come from your internal fuel tanks being glycogen and fat, however by taking in the appropriate volume and type of fuel you can assist glycogen sparing and keep your primary fuel tanks lasting longer. To get an understanding of the internal fuel tanks and usage check out my video explanation Get In the Zone.

Most athletes will consume their energy in the form of carbohydrates and you should have by now practised the volume intake of carbohydrates you require per an hour to keep you sustained through the event. Runners have a more sensitive digestive system due to it being a higher impact sport than cycling so I do advocate smaller feeds, more frequently, as opposed to bigger feeds spaced further apart. The reason for this is twofold firstly the digestive system can cope better with smaller amounts of food at a time and more easily utilise and absorb it as opposed to dealing with a very large amount of fuel at once. Secondly it provides more energy balance. I call this the ‘drip feeding’ method, and I find it works very well for most athletes. Remember Comrades Marathon is primarily a fat tank fuelled event, its pace controlled so more oxygen to the system will allow for a better ability to burn fat for fuel. If you over consume carbohydrates you will give too much rise to insulin levels, mitigating fat burn and landing up on a roller coast ride eventually leading to potential nausea and even cramping if there is a glucose overload.

Fuelling every 20-30 minutes as opposed to every 45 minutes to an hour would be a lot easier on the digestive system and it would allow you to balance that energy system out a lot better. In other words, clock feeding and making sure you do take something every 20-30 minutes. This will ensure  better insulin response as well as less gastrointestinal distress and more manageable absorption in the digestive tracts.

Some runners can get away with as little as 20-30g of carbohydrates per an hour and some need to take a lot more, but anywhere between the 20g-60g mark would be fine based on individual requirements. Remember to stick to what you have done during training. It is not about the amount of carbohydrates that you’re taking in, it is about what your body is capable of absorbing and utilising. Anybody can consume a large amount of fuel, but it does not mean that the body is going to utilise and absorb it and this can lead to severe digestive issues. If you take in too many carbs overdoing it with the sugar and glucose, it can lead to muscle cramping mainly due to poor fluid absorption. It can also lead to dizziness and nausea and it’s the last place you want to be during a race.  My advice is to take in the least amount of fuel to achieve the greatest possible result.

Caffeine during the Race

Caffeine during the race can play a benefit as well. Caffeine does metabolize fully over a period of around 60minutes, so my advice is to have measured doses throughout the event once you do start consuming.  I recommend at least once an hour some athletes consume every 30 minutes, but this is something that needs to be tried and tested in training to see what the optimal dose is for you during exercise. Caffeine has shown to improve performance especially in the form of mental focus and in a long endurance event the mind needs to be focussed and strong.

Protein during the Race

An absolute must for Comrades Marathon is protein consumption on route. If you’re going into an ultra-distance event and it’s going to be a lot longer than 4-5 hours, you should incorporate protein consumption on route, just to help act as a buffer and assist in delaying the onset of muscle fatigue. It also helps satiate you, in other words, it gets rid of the hunger pains and it does break up that intake of glucose. I would highly recommend a 1:3 protein to carbohydrate ratio which has been shown to maximize the delayed onset of muscle fatigue. If you want to know more I have recently done a video on a protein we fuel our gold medallists and elite athletes on route and it works extremely well.  Click here for information on which protein to consume.

Please make sure that you are prepared from a race nutrition perspective. If you’re not prepared, you better start thinking about it very soon and make sure you’ve got some sort of plan for the big day. On the day, stick to your plan, don’t deviate and you will get to the finish line feeling a lot happier and a lot more comfortable. DO NOT try anything different or new on race day.

I wish you all the best of luck, may you have a great race.

 

all the best

M

 

 

Mark Wolff is a certified sports nutritionist and an endurance nutrition and physiology expert with over 20 years experience. An endurance multi-sport athlete with a triathlon, mountain biking and weight lifting background, he works extensively with professional and amateur athletes in a variety of sports disciplines as well as those just wanting to change their lifestyles. He firmly believes that a person can only reach their full potential when their health and nutrition is down packed. Mark’s focus on nutrition and physiology is not just on training and racing, but he places major emphasis on recovery, immune system health, emotional stability, stress management and performance. Mark is co-founder of 32Gi, a sports nutrition company, focused mainly on health and endurance nutrition.

In the lead up to Two Oceans Ultra Marathon myself and David Katz launched a series of podcasts discussing a few topics that all runners should focus on these being:

1. Hydration
2. Taper Week
3. Race Day
4. Fuelling
5. Recovery

In this first part we focus on Hydration:

Hydration is probably one of the most critical aspects when it comes to a sport event, especially an ultra-marathon.

Below is a good read to understand what you should be thinking about around Hydration and you can also listen to the podcast I have pulled in below which I did with David Katz.

What Dehydrates You

A person should be completely hydrated leading up to an event and make sure that they’re in the 100% hydrated state when they start the event. You don’t want to be in a dehydrated state, so the first thing I suggest is to eliminate anything that would possibly dehydrate you.

We’re looking at things like diuretics, overdoing it with diuretics and not replenishing lost fluid. If we take a look at something like alcohol which acts like a diuretic, because it does also pull the fluid out of the muscle. It basically dehydrates you, so that should be completely cut out leading up to that event. Its serves no purpose and will only hamper your ability to remain hydrated properly.

Factor in the Temperature

As far as hydration goes during an event, there’s a few factors that need to be taken into account. The first is taking a look at temperature, humidity and individual sweat loss. An athlete should understand how much fluid they possibly would lose during an hour under certain circumstances or at what time of the day. This understanding comes through training and taking notice of fluid consumption and weight fluctuation before and after exercise due to fluid loss. So early in the morning, you sweat a little bit less and as the day gets hotter, you obviously have a higher sweat rate which means you are losing more fluid in the form of sweat with temperature increases.

Hot and humid climates also play a role in  exaggerating the sweat loss. Hydrating during and event is trying to replenish around 80% of the fluid lost during an event, that is what we aim for from a hydration point of view. As the day gets a little bit hotter, absorption is lowered a little bit and you would need to look at taking a drink with minerals to help further increase that absorption rate.

Possible Hydration Drinks

There are three types of possible hydration drinks one could possibly consume. Obviously there’s water in its purest form, which is a good form of hydration. However, the absorption rate of water on its own is not as high as water with a carbohydrate and a mineral solution. Then in that classification we look at two different types of drinks, one being isotonic and one being a hypotonic drink. A hypertonic drink is energy dense and hampers fluid absorption in favour of energy so we will leave that out as an option. Bare in mind though that if you consume gels or other means of energy products and don’t bring in a sufficient amount of fluid with that intake you will hamper fluid absorption which will lead to issues such as nausea and or cramping so do not overload on energy products.

An isotonic drink has an approximate balance between minerals required for hydration and carbohydrates which are required for energy. There’s very much a balanced pressure which is defined as measurement of osmolality. This occurs between the  digestive system and the blood from a pressure point of view and this balance allows a nice even pull through.

However, as heat goes up, you’re losing a lot more fluid and the body requires a higher rate of fluid absorption to replenish lost fluid in form of sweat. In this case you probably need to look at something like a hypotonic drink. In that case you’re looking at something like a 32Gi Hydrate (Click here to find out more about Hydrate), a mineral complex which will aid a higher rate of fluid absorption.

Try Mineral Loading

One of the things I do recommend is mineral loading and completely hydrating before an event, because it can delay the onset of excessive fluid loss and cramping later on in an event. Obviously you don’t want to be in that state.

I have spoken previously about overdoing hydration and that’s when you consume too much fluid. If you over consume and not being absorbed, what will actually happen is that you will feel a  sloshing effect in the stomach, I call this the ‘washing machine effect’.  At this stage you should stop drinking completely and wait for that fluid to be absorbed before you continue drinking. A salt tablet or mineral complex can help remove that fluid a lot quicker. In order to prevent over- hydration you should rather take smaller frequent sips of fluid over a period of time and not to wait too long to take in any fluid en route. Frequent small feed are best.

Race as you have Trained

In any event you participate in you need to race as you have trained. Do not make any changes on the day as far as hydration goes. You should be very familiar with what you require from a hydration point of view. Do not try anything new on race day.

I hope this helps clarifying hydration before and during your event. Stay tuned for the next blog and podcast covering the taper week leading to your race.

If you want a deeper dive into hydration check out my blog Simply Hydrate

 

all the best

M

Mark Wolff is an endurance, nutrition and physiology expert with over 20 years experience. An endurance multi-sport athlete with a triathlon, mountain biking and weight lifting background, he works extensively with professional and amateur athletes in a variety of sports disciplines as well as those just wanting to change their lifestyles. He firmly believes that a person can only reach their full potential when their health and nutrition is down packed. Mark’s focus on nutrition and physiology is not just on training and racing, but he places major emphasis on recovery, immune system health, emotional stability, stress management and performance. Mark is co-founder of 32Gi, a sports nutrition company, focused mainly on health and endurance nutrition. He is a certified sports nutrition expert as well as a marathon, track, triathlon and cycling coach. He spends most of his time guiding athletes with a very holistic approach to blending training and nutrition for performance and health