Got the first clues a few years back, but could never say it did with any certainty.Then a Lecturer wife went lame a Triathlete. I had to get her fit without impact no running for six months, but she could Cycle and swin but no running. Her Husband monitored everything, she had won the event the previous year it was a mini just over the Hour. This time She won and knocked 7 mins of her PB found that interesting