Pushing your kids too hard to achieve success will have an adverse effect, especially if parents' love for their kids is dependant on achieving success.
Rod Jaques of the English Institute of Sport said that in some case a parent's love could appear 'conditional' on the child achieving sporting success.
This can lead, he claimed, to youngsters developing eating disorders or inventing injuries.
"It's a very delicate balance between encouragement and support for that child, and its potential for being a mentor or a tormentor of the child I think is really quite real.
"Australians have gone a bit further and called this the ugly parent syndrome and we probably have witnessed this on the side of our rugby fields or football fields of the bawling parent, not just at the referee but at the child on the field of play.
'This love for their child should not be conditional on results and unfortunately it sometimes is," he said.