Does the speed of aquatic therapy exercises alter arm volume in women with lymphoedema?

Slow aquatic therapy (Ai Chi) is an exercise protocol based on the principles of Tai Chi, that uses rhythmic, breathing and movement patterns for the whole body. Research 'subjects' will undertake a single sessions of slow aquatic therapy (Ai Chi) of approximately 50 mins. Subjects will participate within a group (8-10) for slow aquatic exercise. They will be measured pre / post the exercise intervention by a researcher who is "blinded" to their exercise format; Ai Chi (Slow) or Conventional (fast). there is then at least a one-week washout period, after which the subjects will be allocated to other intervention (control) exercise protocol. this will again be in a small group (8-10) and again be measured pre / post by the research assistant who is blind to their randomized Exercise protocol.