A randomized Tai Chi study in women with methamphetamine dependence found a working-memory pattern consistent with relative maintenance while the comparison group worsened. That is different from showing that every executive function improved or that Tai Chi was superior on every test.
The trial assigned 76 women in rehabilitation to Tai Chi or conventional exercises, including group calisthenics and square dance. Tai Chi was scheduled for three 60-minute sessions each week over 12 weeks. Researchers assessed Go/No-Go performance, a 3-back working-memory task, switching and physical fitness. Exercise, rather than a stimulant drug, was the assigned intervention.
The 3-back accuracy analysis showed a significant group-by-time interaction. The reported pattern included a decline in the control group; it should not be summarized automatically as an absolute gain in the Tai Chi group. Overall response times on that task became longer at follow-up. Accuracy and speed therefore require separate interpretation, and relative preservation is a more precise description than broad cognitive enhancement.
Go/No-Go accuracy and response time showed time-related changes, but improvement over time alone does not establish superiority of Tai Chi over the active comparator. The switching task showed no significant time effect or time-by-group interaction. The article’s broad conclusion about executive benefits should be read alongside these domain-specific analyses.
The researchers noted potential limitations to blinding in the rehabilitation setting and did not instrumentally monitor exercise intensity. Detailed baseline drug-use characteristics were also limited, and the sample included women in a managed treatment environment. The findings do not establish equivalent effects in men, current intoxication or unsupervised community settings. Nor did laboratory task performance demonstrate reduced relapse or driving risk. A useful interpretation identifies the comparator and asks whether the outcome improved, remained stable while controls declined, or changed similarly in both groups.
See also the difference between exercise-related improvement and comparative superiority.