Tai chi lifted older adults' sleep at 150 min a week

Sleep quality tends to deteriorate with age, and older adults are the group most often looking for something to do about it that is not a medication. Tai chi is routinely recommended as a gentle, low-injury-risk option, and several trials have tested it, but recommendations rarely say how much of it is needed. Without a dose, "try tai chi" is hard to act on and hard to evaluate. This review set out to find the weekly volume, programme length and session length at which sleep benefits actually appear.

The authors searched literature published from 2004 to October 2024 across PubMed, Embase, Web of Science, Google Scholar, the Cochrane Library and the Chinese databases CNKI and Wanfang, in both Chinese and English. They included randomised controlled trials of tai chi that measured sleep quality in older people, with two researchers independently extracting and checking data. Nine RCTs involving 1,166 older participants met the criteria. The pooled outcome was the mean difference in total Pittsburgh Sleep Quality Index score against control groups, with subgroup analyses splitting trials by total weekly minutes, programme duration in weeks, and the length of a single session.

Overall, tai chi cut total PSQI scores relative to controls by 1.53 points (95% CI -2.18 to -0.89), with substantial heterogeneity between trials (I2 = 78%). Splitting by weekly volume, less than 150 min per week produced a reduction of 1.47 points that was not statistically significant (95% CI -3.89 to 0.95), whereas 150-300 min per week gave a significant 1.54-point reduction. Programmes of 8-12 weeks reduced PSQI by 1.93 points and those of 16-24 weeks by 1.27 points, both significant. Single sessions of 60 min improved scores by 2.17 points and shorter sessions of 25-45 min by 0.92 points.

This adds a dose dimension to an already reasonably well-studied idea that mind-body movement helps older people sleep. The pattern suggests a threshold rather than a straightforward more-is-better relationship: the authors conclude that beyond roughly 150 min a week, longer sessions or longer programmes did not add further sleep benefit. Open questions remain. Heterogeneity across the nine trials was high, sleep was captured by questionnaire rather than objective measurement, participants cannot be blinded to whether they are practising tai chi, and the review does not establish whether tai chi outperforms other forms of exercise at the same weekly volume.

For an older reader interested in tai chi for sleep, this is a reason to think about weekly total rather than any single perfect session. The pooled improvement of about 1.53 points on a sleep questionnaire is real but modest, and the trials with the smallest weekly volumes did not show a clear effect. Nothing here suggests that doubling practice time doubles the benefit. Because the evidence rests on self-reported scores in unblinded trials, it is best read as encouraging rather than definitive.