The complaint names USA Triathlon and The International Triathlon Union, both governing bodies for triathlons, and 3-D Racing, an organizer and sponsor.
"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.
At 42 years old, I competed in the Ultraman World Championships, a grueling three-day uber-endurance triathlon circumnavigating the Big Island of Hawaii that involves 6.2 miles of swimming, 260 miles of cycling and culminates with a 52.4-mile double marathon run.
The highlights of my time working with the sport so far have been the 2009 Triathlon World Championships held on the Gold Coast, Australia, which was fantastic for the team as they won five medals overall.
Members of the Leeds Metropolitan University triathlon team, where the brothers train, were among those cheering the pair to glory.
Along with being involved in the London 2012 Open Weekend, Norwich is set to be the venue for a triathlon training camp for the 2012 games.
On home soil in August, for the first time, the Hyde Park triathlon will be run over the full Olympic course.
BBC: Sport - Alistair Brownlee ready for crucial Olympic qualifying year
"The thoughts and prayers of the entire Escape from Alcatraz Triathlon team are with the family and friends of the racer as they mourn this loss, " he said.
Menke says it's a combination of the Olympics -- triathlon made its debut in the 2000 Sydney games -- a growing group of middle-aged competitors looking to reclaim their athleticism, and a desire for fitness-conscious camaraderie.
Burke said he believes the man's death marks the first in the triathlon's 33-year history.
But Menke says, once people are bitten by the triathlon bug, it becomes a way of life.
Three Olympic sports originated in the United States: basketball, volleyball, and the triathlon, which was invented in 1974.
Brits are favored in the 10-kilometer swim and the Brownlee brothers are the men to beat in the triathlon.
It's been talked about so much that Great Britain haven't won a triathlon medal so the pressure was stacked up.
It is the third year the triathlon event has been held in Llanwrtyd Wells - a town that has become a hotspot for quirky sporting events.
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Baseball woud be staged at the famous Yankee Stadium, tennis at Flushing Meadows, basketball at Madison Square Garden and the triathlon in Central Park.
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The winger, who spent some time on the sidelines last season after breaking his leg, said although the triathlon is new to him, swimming certainly isn't.
There are 869 official USA Triathlon clubs in the U.S. McCormack thinks people are looking to challenge themselves and points to the social aspect of the sport.
The triathlon competitors had to do a 1.5km (0.9miles) swim, 40km (24.8miles) ride and 10km (6.21miles) run before crossing the finish line by the Echo Arena on the waterfront.
He says he has been trying to work with triathlon organizers since the rule was enacted and held a protest with 30 other blind people in August in New York.
On the triathlon course, Armstrong was meeting expectations.
WSJ: Lance Armstrong Tour de France Punishment: Triathlon's Loss
Under the plans, tourist landmarks in the city would be transformed with competitors descending on Hyde Park for the triathlon and road cycling events, Horse Guards Parade for beach volleyball and Regent's Park for baseball and softball.
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The Brownlee Triathlon, comprising swimming, cycling and running, will take place at the site on 21 September.
Since losing my dad, I have become not only a two-time IronKids triathlon national champion but also an ambassador to the sport of triathlon.
The 22-year-old represents Britain's best chance of a triathlon gold medal at the London Olympics, but to do that he must come through 2011 in form and injury-free.
BBC: Sport - Alistair Brownlee ready for crucial Olympic qualifying year
The number of sanctioned triathlon races has more than doubled over the last five years to 1, 891 in 2009.
Qualification for the Olympic triathlon relies on a system of points, examples being 1, 000 for winning a World Championship series grand final, 800 for winning one of the other six series events leading up to it, and 500 for winning a Triathlon World Cup race.
BBC: Sport - Alistair Brownlee ready for crucial Olympic qualifying year
Another draw, says Laura Cozik , founder of the Team Lipstick triathlon club, and CNN Fit Nation's Athletic Director, is the ability to cross-train.
He took a victory lap after the deal closed, hauling his three kids around Europe, running a triathlon in Zurich and shadowing the Tour de France by bike.
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