It can act as a graphical biofeedback device that cues you into the impact smoothing your pedal stroke and making small fit adjustments can have to your power output.
But Dr Kirkham said that vaccinating children to prevent this was not thought to be a viable option, as the vaccine had also been linked to stroke in certain small groups of children.
"The first drug that has any efficacy, even very small, will get used a lot, " says Wade Smith, a neurologist and neurovascular stroke specialist at the University of California, San Francisco.