Table 1 summarises details of the patients screened and the 50 (27%) who were eligible to work on the Kinetron and enter the study. Only eight out of 60 patients who were otherwise eligible were unable to be transferred on to the machine and only two of the 52 patients invited to participants could be defined as 'very old', ie over 75 years; only six were 75 years old or less. Exercise data only were available for 12 participants as they were discharged before their mental performance could be tested. One participants could not manage the more difficult card sorting task.