What do you do if you are going to do a long race and don’t like the nutrition that is provided on the course or just want to carry your own? One solution is to use concentrated bottles. When I ran the Paris marathon last year, I used concentrated bottles to pack in 5+ hours of nutrition into 3, 10 oz bottles. I have also had a lot of triathletes use concentrated bottles on the bike or run to allow them to have enough fuel until they get to their special needs bags where they can pick up more concentrated bottles for the second half of their race. This post will describe what concentrated bottles are, how to decide if you want to use them, and how to configure them.
Before I get into the nitty-gritty of concentrated bottles I have to mention a caveat: You MUST practice with concentrated bottles before using them in a race! If you don’t know how to use them, or if you haven’t practiced them, they can very easily go wrong leaving you on the side of the road or in a porta-potty with GI distress. Now. . . on to the topic!
What are concentrated bottles? Concentrated bottles allow you to fit a certain amount of nutrition into a smaller container than what is called for on the label. In order to make concentrated bottles, you have to be using a powdered formula.
Are concentrated bottles right for me? They can be if you have time to practice them, have a way to dilute the concentrated bottles (additional water available on the course), you need to carry a lot of nutrition with you, and you have a powdered fuel you like and knows will not cause you GI distress.
How do you setup and use concentrated bottles? Here is an example: We are working with Suzie who is training for a marathon in Europe. She does not like what will be available as on-course nutrition. Suzie does not have anyone supporting her who can hand her bottles of nutrition during the race. She needs to carry all of her nutrition with her. Suzie will be running with a belt that contains 4, 10 oz bottles. She plans on finishing around 5 hours. She has a powdered drink she has used for a long time that has 45 grams of carbohyrdate per 2 scoops. She needs about 45 grams of carbohydrate per hour (2 scoops per hour). Suzie has decided she wants to use concentrated bottles for her race and fit 5 hours of nutrition into 3 bottles, leaving the 4th bottle for water to dilute the concentrated formula.
Based on this information, we know Suzie needs to fit 10 scoops into 3 bottles. I would put 3 scoops into two of the bottles and four scoops into the third. Then, you can top off with water and mix. This can take some practice and may require you to mix the concentrated mix for each bottle in a container other than the bottle then pour it into the bottle. If you do this, you need to be sure the final mixed solution will fit into the bottle.
Once Suzie has the bottles mixed, she can begin practicing with them. This means carrying them on her long runs and determining how much water she needs to take in with each drink from the concentrated bottle. What I have found is that it is two to three sips of water for every sip from the concentrated bottle. This means that you also need to stop at aid stations and re-fill the 4th bottle with water. As concentrated bottles are emptied, you can fill them with water which results in fewer stops at aid stations. During her runs, Suzie also monitors how much she drinks. She knows that to get 45 grams of carbohydrates our of the first two bottles, she needs to drink 2/3 of a bottle. To get 45 grams of the last bottle, she needs to drink half (the last bottle has 4 scoops in it). If she starts with the bottles that have 3 scoops each, she would follow this schedule: Hour 1, she drinks 2/3 of the first bottle. Hour 2, she finishes bottle 1 and drinks 1/3 of the second bottle. Hour 3, she finishes the second bottle. Hour 4, she drinks 1/2 of the third bottle. Hour 5, she finishes the third concentrated bottle. This gives her all the nutrition she needs to finish the race in 3 bottles she can carry with her. If the bottles do not have marks on them indicating 1/3, 1/2, and 2/3, you can mark them using a permanent marker.
You can use this same methodology on a long bike. Just determine how many carbohydrates you need per hour, how many carbohydrates are in your preferred fuel, the size and number of bottles you will carry, and go from there.
Concentrated bottles are a great tool to have available when you need them. Just remember to practice, practice, practice with them to be sure they will work on race day.