The investigators calculated and pre-loaded 100 baseline frequencies (less 10%) in the sound of a metronome beat in an MP3 format (30 - 130 BPM) [38] onto a DVD-Rom. A user manual was created with a set of instructions that gives each physiotherapist a step-by-step guide on how to calculate the correct beat for their participants and how to successfully upload this beat onto the iPod. In addition physiotherapists in participating centres attended a training session on how to complete the tasks. A pack including the DVD-Rom, user manual, information leaflet and consent was sent to participating centres. Recruitment is due to commence in September 2008.