RIO DE JANEIRO -- Heres how good technology for prosthetic running blades has become.Greek runner Michail Seitis set a world record for his division with a time of 49.66 seconds in the mens 400-meter final on Thursday. He came in sixth place out of eight runners. The five who finished ahead of him were double amputees.Oh, to be bilateral, said U.S. sprinter David Prince, a friend and training partner of Seitis, as he watched the race unfold.Technology for prosthetics has improved so much that it is actually better to be a double amputee in track and field than a single amputee, says Prince, who lost his right leg in a motorcycle accident.That pace of development has accented a trend within Paralympic sports. Sometimes better technology has created a gap between athletes within the same division -- or classification, as its known at the Paralympics -- who have distinctly different levels of disability.Last year and this year were really hard for me to stay motivated to actually continue training, because I go into the race knowing that they (double amputees) run faster times and I know Ill get beat, Prince said.Technology plays a prominent role at the Paralympics, with athletes across a variety of events utilizing different equipment to perform at the top of their discipline.Tatyana McFadden, the top wheelchair racer at this years games, is sponsored by BMW Racing and uses a specially designed chair to perform at her peak.The technology is amazing, McFadden said after one of her races on Thursday. She added: Its important in this sport to have that little extra edge.And more gear is always coming down the pipeline, like a swim cap that alerts a swimmer when a wall is approaching, which is being developed for athletes with visual impairments. Such swimmers are currently tapped on the head by a guide with a long pole.The athlete-technology partnership was acknowledged in the opening ceremony for the Rio Paralympics when a dancer performed a routine with a human-sized robotic arm as a partner, a piece called Harmonious Relationship.The developments are both exciting, and -- to Prince -- somewhat concerning. He worries that some athletes, such as single amputees like himself, will be left behind.At the same time, he does not begrudge double amputees for availing themselves of whatever is within the rules.I support them going tall, said Prince, referring to the fact that newer blades are longer and can increase the height of runners. Because if they go tall and start running these ridiculous times, guess what, the IPC has pressure now to address it.Craig Spence, spokesman for the International Paralympic Committee, said the Rio Games have shown him an increased level of athletic performance. However, he was hesitant to attribute all of it to advances in technology. Training for disabled athletes also is improving.Ive noticed that our athletes are getting faster, stronger and more agile in every single sport, Spence said. Whether I put that down to technology, well youve got to look at the facts that our visually impaired athletes are getting faster as well. As are athletes with coordination impairments and they dont use any piece of technology.Spence said the only stipulation in terms of access to blades or any other piece of technology is that it must be available on the public market.Prices for running blades vary, but the top-of-the-line options can reach tens of thousands of dollars.Prince, who won a bronze medal in the 400 in London and finished sixth in the 200 meters in Rio, said the biggest difference that he has seen between the 2012 Paralympics and this year has not been a new piece of technology, but rather the number of competitors who are using the best equipment available.He also has had conversations with members of the IPC about figuring out competition between single amputees and double amputees. The main question that Prince is concerned with is whether double amputees and single amputees should compete against each other at all.The data is inconclusive, but if you have eyes, you can see, Prince said. It doesnt take a doctorate degree to look at that and say, `Huh, maybe a bilateral does have an advantage over a unilateral amputee.While Prince acknowledges that it is still possible for a unilateral like himself to beat double amputees, he said when he lines up in a lane and sees a top level double amputee competitor, he knows what is most likely to follow.With the number of competitors using the top blades on the market larger than ever, and many of those being under the age 25, what could happen over the next four years is a sharp dropoff in the number of single amputees competing in events against bilaterals, the 33-year-old Prince said.That would be a shame, he feels, and would go against the spirit of the Paralympics.If things progress and were kept together, he said, theres not going to be any unilateral amputees running because we wont have a chance.In order for the sport to stay legitimate, something has to be done.--Garrett Ross is a journalism student at Penn State University. 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Cleveland Cavaliers Pro Shop . If ever they start actually putting pictures beside words in the dictionary, the Blue Jays left-handers mug will appear beside “Consistency. Eddie Jones included six uncapped players in the 33-man squad for the November Tests and here we run the rule over the fresh faces hoping to make their debut against South Africa on Nov. 12.Kyle SincklerSinckler put in his best performance of the season in Harlequins round six Aviva Premiership triumph over Northampton Saints and luckily for the tight-head, Jones was watching on from the stands. He is flourishing under coach Graham Rowntree and the hugely experienced international Adam Jones at Quins. With Paul Hill and Kieran Brookes omitted from the 33-man party, Sinckler should make his debut in November.Mike HaleyThe Sale fullback is potentially seen as a wing option by Jones but earns his place after impressing on the Saxons tour to South Africa last June. Aged just 22, Haleys inclusion is perhaps one for the future as Jones weighs up the extended group who will try and make the cut for the 2019 Rugby World Cup. Haley could be thrown in at the deep end in the November Tests but his debut is more likely to come in Argentina at the end of season.Ben TeoThe Worcester centre was part of the England squad for the Australia tour and despite being in the mix to start the first Test, missed out on selection as he came back from injury. He started the season well with the Warriors but picked up a concussion early on but Jones is a fan of his physicality. He faces a hard task to break up the George Ford-Owenn Farrell partnership but could earn his chance in the November Tests.ddddddddddddAlex LozowskiThe 23-year-old No.10 Lozowski played brilliantly for Saracens when Farrell was sidelined at the start of the campaign and has caught Jones eye. With Ford and Farrell in the fly-half driving seat, Lozowski is unlikely to make his Test debut in November unless the injury crisis worsens for Jones squad. He is one for the future and Jones will watch on with interest to see how Lozowski adapts to the international environment.Nathan HughesWasps No.8 Hughes is an exciting option for England and should make his debut in the end-of-year Tests. He offers immense physicality and would be the perfect impact option from the bench. But with Englands back-row options dropping by the day, Hughes could be in the starting 15 for their autumn opener against the Springboks.Charlie EwelsSecond-row Ewels has been in the England mix under Jones but is yet to make his international debut. Maro Itoje and George Kruis are both sidelined for the November Tests and while Joe Launchbury and Courtney Lawes are in the driving seat to start against the Boks, Ewels will vie with Bath teammate Dave Attwood for a spot on the bench. His versatility means he can also cover the back-row which will work in his favour. ' ' '