Study analysis · Aging clinical and experimental research · 2019
Tai Chi lowers a key pain chemical—but only if you attend most classes, a small study finds.
In older adults with chronic pain, Tai Chi didn't change pain-related blood markers overall, but those who attended at least 70% of classes had significantly lower levels of beta-endorphin, a natural painkiller.
Overview
What the study found
The study in plain English — the bottom line, every takeaway we extracted, and what to do with them.
In simple terms
This study randomly put people into two groups to compare Tai Chi with light exercise. That is usually a strong way to test cause and effect, but this study was very small and meant only to explore ideas, so it cannot prove that Tai Chi causes changes in pain chemicals. It only hints that there might be a link.
What’s the bottom line?
Researchers wanted to see if Tai Chi changes certain blood markers related to pain and inflammation in older people with chronic pain. They compared Tai Chi with light exercise for 12 weeks. Overall, neither exercise clearly changed the blood markers. But in people who came to most Tai Chi classes, Tai Chi lowered one pain-related marker called beta-endorphin.
How strong is this study?
The study had a good basic design because people were randomly assigned to groups. However, it was tiny, many people dropped out, and the main results showed no difference between groups. The one positive result came from a small subgroup, so we should not trust it too much.
40 / 100
- COI disclosure+40/40
- Data availabilitydata not shared
- Code availabilitycode not shared
61 / 100
- Randomization+20/20
- Blindingblinding unclear
- Control group+15/15
- Sample size (n=40)+3.6/20
- Follow-up+10/10
100 / 100
54 / 100
- P-values+15/15
- Effect size+20/20
- Confidence intervalsno confidence intervals
- Pre-registrationnot pre-registered
Each component is scored out of 100 and then capped by the study design — a case series cannot reach the ceiling a randomised trial can, however well it is reported.
Where it sits
RCT reviewsReviews of RCTs (Meta-analyses)
Max 100Randomized TrialsRandomized Trials
Max 90Reviews of Cohort StudiesReviews of Cohort Studies
Max 85Cohort StudiesCohort Studies
Max 72Reviews of Case-Control StudiesReviews of Case-Control Studies
Max 63Case-Control StudiesCase-Control Studies
Max 58Cross-Sectional & Case SeriesCross-Sectional & Case Series
Max 50Expert OpinionExpert Opinion
Max 563 / 100
Probability of being correct
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
This design cannot establish causation — the findings describe an association, not a cause. Although the study is described as a randomized controlled trial, it is an exploratory pilot with a very small sample (40 completers, 19 and 21 with blood samples), no significant overall between-group effects, and a positive finding only in a per-protocol subgroup analysis. Blinding is unknown, and there are multiple comparisons. Therefore, this specific study cannot establish a causal relationship between Tai Chi and changes in beta-endorphin or inflammatory markers.
No Conflicts
No conflicts of interest identified
The authors declare no conflicts of interest, and the study was supported by NIH funding with no industry involvement.
Funders
Conflict Details
National Institutes of Health (NIH): Study funding (NIH-supported randomized controlled trial)
No conflicts of interest declared. Funding from NIH, a government agency, not industry. Small exploratory pilot study. No evidence of funder involvement in design, analysis, or publication.
Key takeaways
- 01
Overall, Tai Chi did not significantly change beta-endorphin or inflammatory markers compared with light exercise.
- 02
Among people who attended at least 70% of Tai Chi classes, Tai Chi lowered beta-endorphin levels (p<0.05), but light exercise did not.
- 03
The study reported a medium effect size but did not give a number.
- 04
No absolute risk numbers apply here because these are blood biomarker levels, not disease cases.
- 05
For a human, this means there is not strong evidence that Tai Chi reliably changes these blood markers.
- 06
The positive per-protocol result comes from a very small exploratory study of 40 people total (19 Tai Chi, 21 light exercise) and could be due to chance or to people who attended more classes being different.
- 07
The study did not report absolute changes in biomarker levels, so we cannot say how many people would benefit or how large the change was.
Surprising findings
- Tai Chi lowered beta-endorphin levels in those who attended most classes, whereas light exercise did not.Exercise is typically thought to increase endorphins, but in chronic pain, elevated beta-endorphin may reflect a dysfunctional opioid system. Tai Chi might help restore balance.
- No effect on inflammatory markers despite expectations.Many studies suggest mind-body exercises have anti-inflammatory effects, but this study found none. The authors note the small sample size may be a factor.
Practical takeaways
If you have chronic pain and are considering Tai Chi, aim to attend classes regularly (at least 70% attendance) to potentially see benefits in pain-related biomarkers.
This is based on a small, exploratory study; the effect on actual pain relief is not established.
low confidenceDon't rely on Tai Chi alone to reduce inflammation; this study found no effect on inflammatory markers.
Other studies have shown mixed results, and longer or more intensive programs might have different effects.
medium confidenceWhy this study matters
No Overall Effect on Pain Biomarkers
In an intention-to-treat analysis of 40 older adults (mean age 74) with chronic pain, 12 weeks of Tai Chi (twice weekly) did not significantly change plasma beta-endorphin or inflammatory markers (CRP, IL-6, TNF-alpha) compared to light exercise. The study was underpowered and exploratory.
Many people turn to Tai Chi for pain relief, but this study suggests it may not broadly alter these biomarkers in the short term.
Adherence Matters: Tai Chi Lowers Beta-Endorphin in Regular Attendees
In a per-protocol analysis, participants who attended at least 70% of Tai Chi classes (vs. light exercise) had a significant reduction in beta-endorphin levels (p<0.05). The effect size was medium but no numeric value was reported. Light exercise did not change beta-endorphin.
This suggests that sticking with Tai Chi might be key to its biological effects, and that the 'dose' of exercise matters.
Counterintuitive: Lowering Beta-Endorphin May Be Good
Beta-endorphin is an endogenous opioid that can relieve pain, but chronic pain is associated with elevated basal levels, possibly indicating opioid system dysfunction. Tai Chi may help normalize this system by lowering beta-endorphin, as seen in the high-adherence group.
It's surprising because we often think 'more endorphins = less pain,' but in chronic pain, the opposite might be true.
No Anti-Inflammatory Effect Found
The study found no significant changes in CRP, IL-6, or TNF-alpha after 12 weeks of Tai Chi or light exercise. This adds to mixed evidence on Tai Chi's anti-inflammatory effects.
Inflammation is a key driver of pain, so the lack of effect challenges the idea that Tai Chi broadly reduces inflammation.
Want the whole report?
Detailed mode opens the full scientific breakdown — every score component, the methodology, conflicts of interest, the evidence analysis behind each claim, and the raw study data.
Overview
What the study found
The study in plain English — the bottom line, every takeaway we extracted, and what to do with them.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Researchers wanted to see if Tai Chi changes certain blood markers related to pain and inflammation in older people with chronic pain. They compared Tai Chi with light exercise for 12 weeks. Overall, neither exercise clearly changed the blood markers. But in people who came to most Tai Chi classes, Tai Chi lowered one pain-related marker called beta-endorphin.
Research results
Overall, Tai Chi did not significantly change beta-endorphin or inflammatory markers compared with light exercise. Among people who attended at least 70% of Tai Chi classes, Tai Chi lowered beta-endorphin levels (p<0.05), but light exercise did not. The study reported a medium effect size but did not give a number. No absolute risk numbers apply here because these are blood biomarker levels, not disease cases.
What this means - more context
For a human, this means there is not strong evidence that Tai Chi reliably changes these blood markers. The positive per-protocol result comes from a very small exploratory study of 40 people total (19 Tai Chi, 21 light exercise) and could be due to chance or to people who attended more classes being different. The study did not report absolute changes in biomarker levels, so we cannot say how many people would benefit or how large the change was.
To examine the effects of Tai Chi versus light physical exercise on plasma beta-endorphin and inflammatory markers (CRP, IL-6, TNF-alpha) in older adults with chronic multisite musculoskeletal pain.
In this exploratory RCT of 40 older adults (mean age 74) with chronic pain, intention-to-treat analyses showed no significant changes in beta-endorphin or inflammatory markers after 12 weeks of Tai Chi or light physical exercise. In a per-protocol analysis limited to participants attending at least 70% of classes, Tai Chi significantly lowered plasma beta-endorphin (p<0.05), while light exercise did not. No significant changes in CRP, IL-6, or TNF-alpha were found. The study was underpowered and exploratory. No retraction or corrections were reported by Crossref/PubMed.
Methods Used
Randomized controlled trial; 40 community-dwelling older adults with chronic multisite musculoskeletal pain; randomized to Tai Chi (8-Form Yang Style) or light physical exercise, 1 hour twice weekly for 12 weeks; fasting plasma beta-endorphin, CRP, IL-6, and TNF-alpha measured; intention-to-treat and per-protocol analyses (>=70% class attendance).
Main Finding
No significant intention-to-treat between-group differences in beta-endorphin or inflammatory markers. Per-protocol: among participants attending >=70% of classes, Tai Chi significantly lowered beta-endorphin (p<0.05) whereas light exercise did not; a medium effect size was noted but no numeric Cohen's d was reported. These are biomarker level changes, so absolute risk/absolute case numbers are not applicable; the study did not report absolute changes in biomarker concentrations.
Confidence Level
Low. This was a small exploratory pilot study (N=40) with limited power for secondary outcomes, no confidence intervals, no numeric effect size, per-protocol findings prone to bias, short 12-week duration, and a mostly white older sample. No retraction or corrections reported by Crossref/PubMed (is_retracted false, has_corrections false, has_errata false).
Study Flags
Red Flags
- •Very small sample (N=40) and exploratory pilot design underpowered for biomarker outcomes
- •Per-protocol finding based on >=70% attendance is not intention-to-treat and may be biased; no confidence intervals or numeric effect size reported
- •Short 12-week intervention and mostly white, older, specific population limit generalizability
Surprising Findings
Tai Chi lowered beta-endorphin levels in those who attended most classes, whereas light exercise did not.
Exercise is typically thought to increase endorphins, but in chronic pain, elevated beta-endorphin may reflect a dysfunctional opioid system. Tai Chi might help restore balance.
Practical Takeaways
If you have chronic pain and are considering Tai Chi, aim to attend classes regularly (at least 70% attendance) to potentially see benefits in pain-related biomarkers.
RCT reviewsReviews of RCTs (Meta-analyses)
Max 100Randomized TrialsRandomized Trials
Max 90Reviews of Cohort StudiesReviews of Cohort Studies
Max 85Cohort StudiesCohort Studies
Max 72Reviews of Case-Control StudiesReviews of Case-Control Studies
Max 63Case-Control StudiesCase-Control Studies
Max 58Cross-Sectional & Case SeriesCross-Sectional & Case Series
Max 50Expert OpinionExpert Opinion
Max 563 / 100
Probability of being correct
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
Human RCT
Subject
Moderate probability
on the GRADE evidence scale
This study randomly put people into two groups to compare Tai Chi with light exercise. That is usually a strong way to test cause and effect, but this study was very small and meant only to explore ideas, so it cannot prove that Tai Chi causes changes in pain chemicals. It only hints that there might be a link.
No conflicts of interest were detected in this study. No score impact.
Strengths
- Randomized controlled design with a light physical exercise control group
- Objective biomarker outcomes (beta-endorphin, CRP, IL-6, TNF-alpha)
- 12-week intervention with twice-weekly classes and monitored attendance
Weaknesses
- Very small sample size, underpowered for between-group comparisons
- Exploratory secondary outcome analysis, not primary endpoint
- No significant overall effect on any biomarker
Methodology
Evidence Keywords
Statistical Reporting
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Researchers wanted to see if Tai Chi changes certain blood markers related to pain and inflammation in older people with chronic pain. They compared Tai Chi with light exercise for 12 weeks. Overall, neither exercise clearly changed the blood markers. But in people who came to most Tai Chi classes, Tai Chi lowered one pain-related marker called beta-endorphin.
Research results
Overall, Tai Chi did not significantly change beta-endorphin or inflammatory markers compared with light exercise. Among people who attended at least 70% of Tai Chi classes, Tai Chi lowered beta-endorphin levels (p<0.05), but light exercise did not. The study reported a medium effect size but did not give a number. No absolute risk numbers apply here because these are blood biomarker levels, not disease cases.
What this means - more context
For a human, this means there is not strong evidence that Tai Chi reliably changes these blood markers. The positive per-protocol result comes from a very small exploratory study of 40 people total (19 Tai Chi, 21 light exercise) and could be due to chance or to people who attended more classes being different. The study did not report absolute changes in biomarker levels, so we cannot say how many people would benefit or how large the change was.
To examine the effects of Tai Chi versus light physical exercise on plasma beta-endorphin and inflammatory markers (CRP, IL-6, TNF-alpha) in older adults with chronic multisite musculoskeletal pain.
In this exploratory RCT of 40 older adults (mean age 74) with chronic pain, intention-to-treat analyses showed no significant changes in beta-endorphin or inflammatory markers after 12 weeks of Tai Chi or light physical exercise. In a per-protocol analysis limited to participants attending at least 70% of classes, Tai Chi significantly lowered plasma beta-endorphin (p<0.05), while light exercise did not. No significant changes in CRP, IL-6, or TNF-alpha were found. The study was underpowered and exploratory. No retraction or corrections were reported by Crossref/PubMed.
Methods Used
Randomized controlled trial; 40 community-dwelling older adults with chronic multisite musculoskeletal pain; randomized to Tai Chi (8-Form Yang Style) or light physical exercise, 1 hour twice weekly for 12 weeks; fasting plasma beta-endorphin, CRP, IL-6, and TNF-alpha measured; intention-to-treat and per-protocol analyses (>=70% class attendance).
Main Finding
No significant intention-to-treat between-group differences in beta-endorphin or inflammatory markers. Per-protocol: among participants attending >=70% of classes, Tai Chi significantly lowered beta-endorphin (p<0.05) whereas light exercise did not; a medium effect size was noted but no numeric Cohen's d was reported. These are biomarker level changes, so absolute risk/absolute case numbers are not applicable; the study did not report absolute changes in biomarker concentrations.
Confidence Level
Low. This was a small exploratory pilot study (N=40) with limited power for secondary outcomes, no confidence intervals, no numeric effect size, per-protocol findings prone to bias, short 12-week duration, and a mostly white older sample. No retraction or corrections reported by Crossref/PubMed (is_retracted false, has_corrections false, has_errata false).
Study Flags
Red Flags
- •Very small sample (N=40) and exploratory pilot design underpowered for biomarker outcomes
- •Per-protocol finding based on >=70% attendance is not intention-to-treat and may be biased; no confidence intervals or numeric effect size reported
- •Short 12-week intervention and mostly white, older, specific population limit generalizability
Surprising Findings
Tai Chi lowered beta-endorphin levels in those who attended most classes, whereas light exercise did not.
Exercise is typically thought to increase endorphins, but in chronic pain, elevated beta-endorphin may reflect a dysfunctional opioid system. Tai Chi might help restore balance.
Practical Takeaways
If you have chronic pain and are considering Tai Chi, aim to attend classes regularly (at least 70% attendance) to potentially see benefits in pain-related biomarkers.
RCT reviewsReviews of RCTs (Meta-analyses)
Max 100Randomized TrialsRandomized Trials
Max 90Reviews of Cohort StudiesReviews of Cohort Studies
Max 85Cohort StudiesCohort Studies
Max 72Reviews of Case-Control StudiesReviews of Case-Control Studies
Max 63Case-Control StudiesCase-Control Studies
Max 58Cross-Sectional & Case SeriesCross-Sectional & Case Series
Max 50Expert OpinionExpert Opinion
Max 563 / 100
Probability of being correct
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
Human RCT
Subject
Moderate probability
on the GRADE evidence scale
This study randomly put people into two groups to compare Tai Chi with light exercise. That is usually a strong way to test cause and effect, but this study was very small and meant only to explore ideas, so it cannot prove that Tai Chi causes changes in pain chemicals. It only hints that there might be a link.
No conflicts of interest were detected in this study. No score impact.
Strengths
- Randomized controlled design with a light physical exercise control group
- Objective biomarker outcomes (beta-endorphin, CRP, IL-6, TNF-alpha)
- 12-week intervention with twice-weekly classes and monitored attendance
Weaknesses
- Very small sample size, underpowered for between-group comparisons
- Exploratory secondary outcome analysis, not primary endpoint
- No significant overall effect on any biomarker
Methodology
Evidence Keywords
Statistical Reporting
Scoring
How strong is this study?
The study had a good basic design because people were randomly assigned to groups. However, it was tiny, many people dropped out, and the main results showed no difference between groups. The one positive result came from a small subgroup, so we should not trust it too much.
40 / 100
- COI disclosure+40/40
- Data availabilitydata not shared
- Code availabilitycode not shared
61 / 100
- Randomization+20/20
- Blindingblinding unclear
- Control group+15/15
- Sample size (n=40)+3.6/20
- Follow-up+10/10
100 / 100
54 / 100
- P-values+15/15
- Effect size+20/20
- Confidence intervalsno confidence intervals
- Pre-registrationnot pre-registered
Each component is scored out of 100 and then capped by the study design — a case series cannot reach the ceiling a randomised trial can, however well it is reported.
Where it sits
RCT reviewsReviews of RCTs (Meta-analyses)
Max 100Randomized TrialsRandomized Trials
Max 90Reviews of Cohort StudiesReviews of Cohort Studies
Max 85Cohort StudiesCohort Studies
Max 72Reviews of Case-Control StudiesReviews of Case-Control Studies
Max 63Case-Control StudiesCase-Control Studies
Max 58Cross-Sectional & Case SeriesCross-Sectional & Case Series
Max 50Expert OpinionExpert Opinion
Max 563 / 100
Probability of being correct
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
This design cannot establish causation — the findings describe an association, not a cause. Although the study is described as a randomized controlled trial, it is an exploratory pilot with a very small sample (40 completers, 19 and 21 with blood samples), no significant overall between-group effects, and a positive finding only in a per-protocol subgroup analysis. Blinding is unknown, and there are multiple comparisons. Therefore, this specific study cannot establish a causal relationship between Tai Chi and changes in beta-endorphin or inflammatory markers.
No Conflicts
No conflicts of interest identified
The authors declare no conflicts of interest, and the study was supported by NIH funding with no industry involvement.
Funders
Conflict Details
National Institutes of Health (NIH): Study funding (NIH-supported randomized controlled trial)
No conflicts of interest declared. Funding from NIH, a government agency, not industry. Small exploratory pilot study. No evidence of funder involvement in design, analysis, or publication.
Standing
The people behind it
The researchers who wrote the study this analysis is built on.
Authored by
8 researchersIf this is your work, this is how we attribute it on Fit Body Science. Tongjian You is listed as the lead author.