protein swim practice

How Much Protein to Consume During Swim Practice

Dr. GJohn Mullen Blog, Kevin Iwasa-Madge, Latest&Greatest, Nutrition/Supplements 3 Comments

Take-Home Points on Swim Practice Protein Intake:

  1. Ingesting protein during training can minimize muscle breakdown from training.
  2. Protein should be ingested in smaller quantities (10-20g) than carbohydrate (up to 80g) because they are digested slower.
  3. Consume this amount of protein and carbohydrate with large amounts of liquid (1L/32oz) to prevent a hypertonic training drink that can lead to dehydration and an upset stomach.Swim Practice Protein Intake

As an athlete exercises, skeletal muscle is broken down, this is known as catabolism.  Conversely, when protein is ingested, skeletal muscle is synthesized, or grown. This is known as anabolism. The catabolic/anabolic balance, or the balance between break down, and growth, determines long-term muscle gains or losses.  In essence, you never have exactly the same amount of skeletal muscle, because it is always breaking down or growing in small amounts.  This is an essential scientific principle to understand.

For athletes, and swimmers are no exception, increased amounts of dietary protein are essential.  I want to dispel a myth right now; PROTEIN IS NOT JUST FOR BULKING UP! Swimmers also have an increased need for protein… Trust me! Muscle soreness is a result of muscle breakdown. Even if a swimmer is doing primarily aerobic-type training, skeletal muscle is still being broken down, and needs to be repaired if the swimmer wants to stay strong and healthy day after day.

So if you accept the premise that swimmers have an increased need for protein over a sedentary individual to balance off the increased muscle break down from training, then the idea of consuming protein (anabolic) while training (catabolic) actually seems quite logical.  It’s not that simple though; the body can only absorb so much protein at one time, especially during rigorous training.

The key here is the ratio of protein to water. So protein gels or bars can work, but it can get a bit tricky when it comes to figuring out how much to take relative to the amount of liquid being consumed.  Too much protein and not enough water make what is called a hypertonic solution.  This can lead to cramping, poor digestion, and dehydration.  Alternatively, the less protein you ingest, the less protein available to prevent muscle breakdown.  Again, it’s a balancing act:

1-2% protein solution is ideal (i.e. 10-20g of whey protein in a 1L (32oz) bottle).  This can be combined with a carbohydrate solution as well (carbohydrate intake during training can delay the onset of fatigue).

Example Swim Practice Protein Intake

  • 1L (32oz) bottle
  • 10g of whey
  • 50g of dextrose (carbohydrate can be consumed in much larger amounts (up to 80g) because they are digested much quicker than protein)Swim Practice Protein Intake

This is a 1% protein solution and 5% carb solution when the bottle is filled

The key is the size of the bottle, as 20g of whey in a 500ml (16oz) bottle, is actually a 4% protein solution. This could be hypertonic.  Soft drinks are a great example of a hypertonic carbohydrate solution.  Too much carbohydrate and not enough water leads to the soft drink being hypertonic. This can dehydrate an athlete, which is why we don’t drink soft drinks during training.

Again, using a 1L (32oz) bottle ensures the ratio of protein and carbohydrate to water is simple to establish (10g = 1%) and consistent throughout training, even if athletes don’t get through the whole bottle.

By Kevin Iwasa-Madge BASc, CISSN owner of iMadgen Nutrition, and as a former top-5 finisher in the world as a freestyle wrestler, Kevin embodies the lifestyle of an elite athlete. Kevin completed his undergraduate degree at the University of Guelph in the Applied Human Nutrition. This clinically focused program allowed him the opportunity to address a range of diseases from a nutritional approach. After graduation Kevin attained his certification in sports nutrition from the International Society of Sports Nutrition.

Athletically, Kevin has been an elite wrestler for over 10 years, competing for both the University of Guelph and Team Canada. Kevin is a former First Team All-Canadian, Academic All-Canadian, and Canadian Champion. As a varsity athlete, Kevin was short-listed for the prestigious Student-Athlete of the Year award. He currently trains with and competes for the Guelph Wrestling Club and National Team. Over the years, Kevin has worked with a range of individuals, from those looking to improve their overall health, to rugby player, football players, swimmers, professional fighters, wrestlers, endurance athletes and more.

Originally published 02/20/2015

Comments 3

  1. Thanks for the article.

    Please could you confirm that you use whey and dextrose powder, and just mix them both in with the water, in the ratios described? Thanks

  2. It is important to stress that the amount of protein needed by a training athlete is not great. Keep in mind that one ounce is equal to a bit less than 30 grams (28.5g = 1 ounce).

    The USDA recommends 0.8 g/kg of body mass for non-athletic women. So, a 130 pound woman would need around 50 g of QUALITY protein per day. An exercising woman needs around 75 to 80g per day. These are not excessive amounts. For a 180 pound male, 60 grams for a non-athlete and 80 – 90 fora male who works out an hour 5 times per week. For high level athletes, a female’s needs increase to 90 to 100g and a male to 120 to 130g.

    THE BEST SOURCE OF PROTEIN is egg whites, fish and meat. A vegetarian/vegan must closely monitor their intake of protein and get protein from a variety of plant sources as no single plant offers all of the amino acids (building blocks of proteins) as do animal sources.

  3. Very interesting information. Does this apply for swim workouts of an hour to 1.5 hours long? I ask because I usually have my athletes consume a snack of protein and carbs (e.g., a handful of almonds and 3-5 dates/figs/dried apricots). The goal being to tide them over until dinner or a full breakfast if that will happen within an hour. This idea seems more applicable to longer 2-3 hour workouts, but thought I’d ask to see what you thought.

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