Cardiac conditions that required surgery have forced into retirement two winners of the Ironman Triathlon World Championship.
As well as leading the research, Dr Roberts is also set to take part in the Ironman event.
The growth in shorter races has opened up the sport to more people who are not ready to conquer the Ironman distance.
Although Armstrong had been competing as a professional, the Usada ban would also prevent him from competing as an amateur in the Ironman, Messick said.
WSJ: Lance Armstrong Tour de France Punishment: Triathlon's Loss
With his already strong swim improving dramatically, Ironman analysts figured that Armstrong could have won the Ironman World Championship with a marathon time of 2 hours, 55 minutes.
WSJ: Lance Armstrong Tour de France Punishment: Triathlon's Loss
Garlett was invited to compete in the elite event because organizers believe he "demonstrates the Ironman mantra: Anything is possible, " said Blair LaHaye, director of communications for Ironman.
CNN: Heart transplant patients push physical limits at Ironman
Scheidies, who has completed the Ironman Triathlon, which includes a 2.4 mile swim, 112-mile bike ride and 26.2 mile marathon, registered for Detroit's Motor City Triathlon on June 17.
That record had been held by Australia's Chris McCormack, a two-time winner of the Ironman World Championship who subsequently called Armstrong the athlete to beat in Kona this October.
WSJ: Lance Armstrong Tour de France Punishment: Triathlon's Loss
Mark Allen, the former All-American swimmer at UC San Diego who went on to win the Ironman Triathlon world title six times, says he finds that kind of fortitude amazing.
More important, and cooler, it can accept digital maps of real bike routes like the Ironman Kona and simulate elevation changes up to a 15% grade by making pedaling harder.
LaHaye said a handful of athletes are invited to take part in the event each year, but their inclusion doesn't reduce the number of slots for those who get in by doing well in qualifying events, or by winning a spot through the Ironman lottery.
CNN: Heart transplant patients push physical limits at Ironman
It would take him five more tries before he won the preeminent Ironman event.
This past fall, Bastianich completed the formidable Ironman World Championship in Kailua-Kona, Hawaii.
Two weeks before I raced at the World Ironman Championships in Kona, Hawaii, last year, I had a bad bike crash.
"Lance Armstrong is currently still eligible to compete in all USA Triathlon-sanctioned races, with the exception of Ironman events as stated earlier by the World Triathlon Corporation, " said the body's communications director Chuck Menke.
And the sport, just as the athletes, comes in all shapes and sizes, from the 15-plus-hour Ironman distance, to the entry-level super-sprint distance.
"He got a drug ban and I would like to see him honor that and not race, " said Matty Reed, a former American Olympic triathlete who will compete this Saturday in a sprint version of the Superfrog Half Ironman that Armstrong will enter Sunday.
He is forgoing Ironman races to focus on short course racing again in hopes of qualifying for the 2012 Summer Olympics in London (an Olympic distance triathlon is about one-quarter the distance of an Ironman).
Before the ban, he was competing in Ironman triathlons and had won two of the five events he had entered.
In June, he won at Hawaii's Ironman 70.3 an abbreviation for half Ironman, the full distance being 140.6 miles.
WSJ: Lance Armstrong Tour de France Punishment: Triathlon's Loss
In this talk I also share a bit about my experience training for and doing an Ironman and the similarities and differences in doing a startup.
He'd already finished ten marathons and more than a dozen triathlons, including the body-bashing Ironman race in Hawaii (2.4 miles of swimming, 112 miles of biking and a 26-mile run).
That's not all for the Android department, though -- it looks like there might also be a portrait QWERTY slider in the works for the third quarter codenamed "Ironman, " pictured, which will pack 3G, WiFi, and some sort of high-res camera.
ENGADGET: Motorola's first Android phone(s) to have sliding QWERTY?
He is the only man to finish four Ironman events in less than eight hours.
The device also has got all the features of Timex's Ironman Triathlon sports watch.
This Saturday's race, the city's first annual Ironman-length triathlon set to include 140 miles' worth of swimming, biking and running may end up being just two phases.
"I never got past being that little girl who thought she couldn't run, " she said, describing how she would watch Ironman competitions with amazement at the monster triathlon.
Before his Ironman career he was undefeated in the U.S. for three straight years in short-course triathlons.
Montgomery tapped former Ironman winner Steve Larsen to help engineers with the design.
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