How many calories should you consume in a marathon swim?
According to an article on the ”Nutrition Demands of Open Water Endurance Swimming,” swimming burns 2.93 calories per mile, per pound. The author, Don Macdonald, did the math and figured that he burns approximately 15,000 calories during a 24-mile swim. Later in the article, Macdonald goes on to say:
As you can imagine, it is difficult to eat 15,000 calories over a 13-hour period without training the stomach to handle this input.
Leaving aside the reasons (discussed previously) that the above formula is probably bogus, let’s think about this: eating 15,000 calories in 13 hours. That’s 1,154 calories per hour. Burning this many calories is one thing. You might be able to do it for an hour; probably not for 13 hours straight.…
In the last post I bemoaned the lack of credible science about marathon swimming. One is reminded of the William Goldman quote about the movie industry: Nobody knows anything.
Here’s a good example. A few days ago a Facebook friend linked to an intriguing-looking article. Published on a science-y looking website (“Your one-stop resource for longevity, health, exercise, nutrition, and scientific articles all to help you live a longer, fuller life”), the article is authored by marathon swimmer Don Macdonald.
One section seemed of particular interest: “Nutritional Demands of Open Water Endurance Swimming.” An excerpt:
Nutritional endurance demands biochemical changes of your body. The basic calculation for the amount of calories burned while swimming is 2.93 calories per mile, per pound. I weigh 207 pounds, and therefore burn 14,556 calories in a 24-mile swim, (2.93 calories x 24 miles x 207 pounds = 14,556 calories).
In marathon swimming, there’s very little in the way of credible science – that is, methodologically rigorous, experimentally controlled, peer-reviewed science. It’s not hard to understand why: Open-water swimming, especially the marathon variety, is a tiny market compared to land-based endurance sports. Market size is related to the potential for making money, and the potential for making money is, in turn, related to funding and motivation for scientific research. Even in triathlon (an enormous, lucrative market), swimming is often seen merely as a warm-up to the bike and run, so there’s little effort to understand it.
As a result, marathon swimmers are left with approximately four strategies for acquiring knowledge about their sport – specifically, the physiological demands of long-distance swimming, and the nutrition required to fulfill those demands:
Figuring out what is known, scientifically, about land-based endurance activities, and applying it to swimming.
Among channel swimmers, the Danish sports drink Maxim is something of a magical elixir. The reasons for this are beyond the scope of this post, but for additional details I recommend a search of the Channel Swimmers chat archives – especially posts by CS&PF pilot Michael Oram.
Maxim is an excellent product. Indeed, it fueled three of my four ultra-marathon events this year (Tampa, MIMS, and Catalina). What’s interesting about Maxim is how simple it is. The ingredients: 97% maltodextrin, with a smattering of Vitamins C and B1. Maltodextrin is a complex carbohydrate of chained glucose polymers, and is the basis for other popular endurance fuels including Perpetuem, HEED, and EFS. Maxim, however, has no added protein (Perpetuem), no added amino acids (EFS), and no added electrolytes (all three).…
The blue whale is the largest known animal to have ever existed – up to 110 feet long and weighing nearly 200 metric tons. The whales are drawn to the deep waters off the coast of Southern California in late summer and fall to feed on krill (up to 40 million a day for an adult).
These magnificent, peaceful creatures were hunted nearly to extinction in the 20th century. Though still endangered, their West Coast population (estimated at 2,500) has been gradually recovering – to the delight of whale watchers… and swimmers of the Catalina and Santa Barbara Channels!
Check out this guy kayaking with them off Redondo Beach a few days ago. See, especially, the underwater shots at 1:12 and 2:15.
I’ve never been much of a museum guy – even less so when I was kid.…
I’ll go out on a limb and say: This may be the best video ever made about a marathon swim. At least, it’s the best one I’ve seen (and I’ve seen a few). Perhaps it’s more appropriate to call it a “short film.” The production values are that high.
The film, by Stephen Lewis, tells the story of Marc Lewis’ unprecedented 27.5-mile swim between Santa Rosa Island and the California mainland in 2008. It features 720p video quality, an imaginative soundtrack of Sigur Ros, The Ventures, Radiohead and Beethoven, stunning photography of the Santa Barbara Channel, and thoughtful interviews with Marc’s family, coaches, observers, and crew.
Correcting a bit of misinformation from the comments section of a recent post…
Tandem swimming is allowed on Catalina swims, so long as each member of the tandem is sanctioned by CCSF. This is from a CCSF official:
The CCSF recognizes a difference between a SANCTIONED swimmer and a COMPANION swimmer. Sanctioned tandem swims are allowed.
What’s at issue is the COMPANION swimmer, who typically knows the swimmer but has no relationship with the CCSF (eg application, swim history, insurance). For safety purposes, the CCSF wishes to limit that swimmer’s time in the water to a maximum of 3 hours in shifts no longer than 60-minutes. That’s more in accordance with English Channel standards. Different than Dover, a CCSF swimmer could– if they so desired– recruit 5 companion swimmers.
The second in a series of posts taking a statistical look at the history of Catalina Channel swimming. These analyses have not been validated or endorsed by the Catalina Channel Swimming Federation and should be considered “unofficial.” 2011 swims are included, but are unofficial until the ratification banquet on November 5.
CCSF’s official list of successful swims is available here. Penny Lee Dean’s authoritative history is here.
On January 15, 1927, George Young was the only one of 102 participants to finish the Wrigley Ocean Marathon, and in so doing, became the first person to swim across the Catalina Channel. For his achievement Young earned a $25,000 prize – approximately $325,000 in 2011 dollars, and richer (even in nominal dollars) than any current cash prize in professional marathon swimming.…
The first in a series of posts taking a statistical look at the history of Catalina Channel swimming. These analyses have not been validated or endorsed by the Catalina Channel Swimming Federation and should be considered “unofficial.” 2011 swims are included, but are unofficial until the ratification banquet on November 5. CCSF’s official list of successful swims is available here.
I should note that Penny Lee Dean did some similar statistical work in her authoritative History of the Catalina Channel Swims Since 1927. However, the book has not been updated in 1996, and in any case, the stats chapter seems to have been removed from the online version.
The Catalina Channel was first conquered in 1927 by George Young of Canada, in 15 hours, 44 minutes, 30 seconds. …