A British Paralympic athlete has revealed she quit the sport after it left her with feelings of "humiliation and disempowerment" about her disability.
Bethy Woodward, a silver medallist in the 200 metres (T37) at London 2012, said her feelings of humiliation were "building and building".
Bethy believes that when she started in the sport, the T38 category was primarily people with cerebral palsy (CP) but in four years there are now a lot more people with cerebral palsy like symptoms.
"You are not able to compete with them, you are not able to get to their standard," she said. "I believe that there is not a level playing field anymore.
"As a Paralympian and a disabled person you face physical barriers every day. Every day you are trying to get over a physical barrier and you never feel strength because everything feels like a struggle. When you are in a stadium or gym, or on track, you feel physical strength and that's such an empowerment to a disabled person.
"When you are in a race, when you are so far behind, your disability becomes a humiliation because that's the one thing that is stopping you being that fast, and then that strength goes and all you feel is weakness and humiliation about that disability.
"People at home aren't going to understand why we are so far behind and so you just feel worthless, that you are not fast enough. You feel that you haven't trained hard enough and your CP is at the forefront of that.
"If you watch my race in London 2012, it was a real battle. I came off the bend, I was in fifth place. My parents thought 'right we are going to have to tell her it's the taking part that counts' and I pushed myself and pushed myself and managed to come away with a silver medal that I didn't even realise I'd got.
"That feeling of being with these girls who've experienced what I've experienced my whole life and to fight for them for something great in a stadium that is packed with 80,000 people, who are really enjoying what we do, is an incredible experience."
Bethy believes lots of new people have come into the sport that maybe are not as disabled as her and her former competitors post-2012.
She added: "We need to understand what their disability is and we need to understand how their disability affects them if it is the same we experience in our disability.
"That's fair enough if you want to do that but we should be consulted as Paralympic athletes with CP that that is happening to our class, and we need to have confidence that when we get onto that track that it is real and it is happening."
Michael Breen, the father of Paralympic athlete Olivia Breen (T38) also has concerns about the classification system.
He said: "The way the IPC phrase it for T38, they talk about cerebral palsy or cerebral palsy like symptoms. So that kind of begs the question if someone is, shall we say, over 400m around 20 metres or 30 metres ahead of the field, you need to start questioning how like cerebral palsy is it?
"Because I would say going back to the argument about fair and equal competition, it's not sufficiently like CP because that person is too far ahead. They have too great an advantage."
An International Paralympic Committee (IPC) spokesman denied that the cerebral palsy class had been broadened.
He said: "The 30's classes are not, and never have been, just for athletes with cerebral palsy. The classes cover a range of co-ordination impairments as well. There has been no broadening of the system like a few individuals suspect. Classification is about how about an athlete's impairment impacts their ability to do sport.
"The IPC is satisfied and confident that British athletes who compete internationally are in the correct class. Paralympic sport is evolving all the time and more and more athletes are now full-time and benefiting from world-class training regimes.
"As a result, athletes across all Paralympic sports are producing better performances across the board. Just because there are new athletes delivering better performances, it does not mean they in the incorrect class.
"At the end of the day, Paralympic sport, like any Olympic sport, is high-performance sport featuring the world's best athletes. The ultimate goal of athletes who take part is to win within the rules."
Woodward, who was born in Ringwood, knows people will say she is talking out because she is not winning, but she denies this.
"That's the thing about para sport, it really isn't about the winning and that's where it's got lost as Paralympics is about people overcoming their own disabilities and also about healthy competition and showing the public that yes you have a disability, but you can still use your disability to give you strength," she said.
"As a young person to go through the incredible experience where you come to terms with your disability that you run in a stadium full of 80,000 people and your disability is the one thing that got you there and then three years later being the hardest thing you have and something that really hinders you.
"To see a T35, which is the class for the most amount of CP for ambient standing athletes. To see them race is the most incredible thing you can do because they've spent their whole life trying to walk and then they get on track to run.
"It may take them 20 seconds, it may take them 17 seconds, but you'll never know about that as these superhuman performances make it look like that person at the front is running ridiculously faster than anyone else and you forget with that glorious battle between these human beings that their bodies are disjointed. But they've spent most of their life getting to that. The public then don't understand disabled sport to what it really is.
"It's almost condoning the fact these performances are happening and thinking 'wow look at these disabled people so far ahead of the rest' where it's actually the rest where the inspiration comes from. It's why Ludwig Guttman founded the Paralympics in the UK, to make sure these people at the back have a purpose."
UK Athletics (UKA) has said its plans to conduct an investigation into classification following the Paralympic Games and the British Paralympic Association has backed the review.
In an official statement UKA said: "UK Athletics is not responsible for the classification of any of its athletes competing internationally. The system is a highly complex one, involving a very wide range of physical conditions and requiring detailed analytical processes.
"UK Athletics is confident of the classification of all British athletes who will be competing in Rio and we always cooperate 100 per cent with the IPC to ensure that all GB athletes are correctly classified. Where concerns have been raised, UKA have correctly responded by requesting that the IPC check medical and procedural records to either ratify or change the athlete classification.
"A complaint was made earlier this year in connection with the classification of other athletes. This was fully investigated by UKA and the IPC and was found to be without any merit."
The British Paralympic Association said: "Athletes are grouped into classes based on functional ability, and as no two athletes are identical there will naturally be very small degrees of difference in functionality within classes. The classification procedure is designed to minimise discrepancy and maximise fairness in competition.
"We recognise that the process of classification is one that is in continuous development in order to be the best process it could possibly be, but that more work is required.
"We are aware that some allegations were made to the IPC in recent months and that these were investigated and concluded no changes to athlete classification were required.
"We are aware of British Athletics' intention to review their classification processes after Rio 2016 and fully support this, as regular review of processes is good practise. The British Paralympic Association is committed to our belief in fair sport, and so remains fully committed to supporting any investigation of intentional misrepresentation and supports strong sanctions for any individual found guilty of this."
Bethy now believes there should be an independent review run by medical experts into classification.
She said: "I'd like to see that CP athletes are consulted about how the sport is going to develop and everyone is given a voice and everyone has protection and a place to go to say 'I don't agree with this or could you explain yourself about this', so that everyone feels when they are on that track they are on a level playing field and in an actual competition, as they are not competitions at moment."