They split into three groups doing strength building exercises or stretching or Tai Chi.
After six months, those doing Tai Chi were stronger and better balanced than the others. They also had significantly less falls and slower rates of decline in motor control. Source: Tai Chi and Postural Stability in Patients with Parkinson's Disease.Fuzhong et al Feb 2012However, some doubt has been expressed over the validity of this study.Overall, the present consensus appears to confirm that tai chi may do some good and it is very likely that it will not do any harm.
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