A 22-person per-group Thai randomized trial found that combining Thai massage with a traditional herbal formula (Ya Thamlai Phra Sumeru) reduced chronic low back pain and disability more than either intervention alone . The study was small and single-blind, limiting generalizability.
Chronic low back pain affects an estimated 619 million people globally, with prevalence particularly high among agricultural workers. This randomized controlled trial tested whether combining two traditional Thai therapeutic approaches could improve outcomes better than either alone in a population of 66 individuals with chronic low back pain in Surin Province, Thailand.
The study divided participants into three groups of 22. The herbal remedy group received 2,000 mg of Ya Thamlai Phra Sumeru (YTPS), a traditional Thai herbal formula, twice daily for seven days. The Thai massage group received sessions three times per week. The combined therapy group received both treatments simultaneously. Researchers measured pain using the Numerical Rating Scale, functional mobility with a goniometer and flexible ruler, and disability using the Oswestry Disability Index, a validated questionnaire assessing functional limitation from back pain.
Chemical analysis identified piperine (a black pepper alkaloid) and cannabidiol as key active compounds in the herbal formula, both of which showed antioxidant capacity in laboratory assays. The researchers also tracked oxidative stress biomarkers including malondialdehyde (MDA), catalase (CAT), glutathione (GSH), and superoxide dismutase (SOD) before and after treatment. All three groups showed improvements in oxidative profiles, with increased antioxidant enzyme activity and reduced MDA levels. However, the combined therapy group demonstrated the largest reductions in pain scores, spinal mobility limitations, and disability index scores compared to single-intervention groups (p<0.05). No significant adverse changes in kidney function (blood urea nitrogen, creatinine) or liver function (AST, ALT) were observed across any group, suggesting safety over the seven-day treatment window.
The magnitude of improvement in the combined group appears clinically meaningful on the Oswestry Disability Index, though the study's small size per group, single-blind design (participants knew which treatment they received), and seven-day duration limit confidence in these findings. Longer follow-up data and larger, double-blind designs would clarify whether benefits persist and generalize beyond this specific population and setting.
This study provides preliminary evidence that combining manual therapy with herbal supplementation may produce greater pain reduction than either approach alone for individuals with chronic low back pain. The relevant takeaway is not about the specific formula tested, which is culturally specific to Thailand, but rather the potential value of integrative approaches.
For chronic low back pain management in general, the evidence supports several well-established approaches: structured resistance-training targeting core stability, posture-routine work, and stretching programs consistently rank high in evidence tiers for durability of benefit. Manual therapy including massage shows moderate short-term benefit, particularly when combined with movement-based interventions. The addition of herbal agents with antioxidant properties aligns with the emerging understanding that oxidative stress contributes to chronic pain conditions, though the evidence base for specific herbal formulas remains limited.
If you manage chronic low back pain, this study reinforces that combination approaches tend to outperform single interventions. This might mean pairing physical therapy with complementary modalities you find tolerable, rather than relying on any single treatment alone. The seven-day timeline in this study is notably brief, so understanding long-term maintenance strategies matters more than acute response.
| Parameter | Details |
|---|---|
| Study type | Randomized controlled trial, single-blind |
| Sample size | 66 total (22 per group) |
| Population | Agricultural workers with chronic low back pain in Surin Province, Thailand |
| Intervention groups | (1) Herbal remedy only: 2,000 mg YTPS twice daily, 7 days; (2) Thai massage only: 3 sessions/week; (3) Combined: both interventions |
| Primary outcomes | Pain (NRS), spinal mobility (goniometer, flexible ruler), disability (Oswestry Disability Index) |
| Secondary outcomes | Oxidative stress markers (MDA, CAT, GSH, SOD) and biochemical safety (BUN, creatinine, AST, ALT) |
| Key findings | Combined therapy group showed greatest improvements in pain and disability (p<0.05); all groups improved oxidative profiles; no adverse biochemical changes |
| Study quality | Small sample size per group, single-blind design, short 7-day treatment window, no long-term follow-up |
| Journal | Journal of Complementary & Integrative Medicine |
| PubMed ID | 41277745 |
National Center for Biotechnology Information. Assessing the impact of massage and herbal therapies on chronic low back pain: a randomized controlled trial. PubMed ID: 41277745.
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