#MindinBody - feasibility of vigorous exercise (Bikram yoga versus high intensity interval training) to improve persistent pain in women with a history of trauma: a pilot randomized control trial
Question
Is vigorous exercise feasible for women with persistent pain and trauma history, and do Bikram yoga and HIIT differ on pain, psychological, functional, and autonomic outcomes?
Summary
This pilot randomized trial compared 8 weeks of Bikram yoga with a gym-based high-intensity interval training class in women with persistent pain and trauma history. Pain severity and interference improved over time across both groups, but there was no between-group difference for the primary pain outcome. Bikram yoga showed better physical functioning, mental health, and HRV signals than HIIT. The HIIT comparator was feasible for some participants but had lower completion and was not precisely intensity-quantified.
Methodology
- Thirty-two women with persistent pain and a history of trauma randomized to Bikram yoga or HIIT.
- 32 participants.
- Functional small-group HIIT.
- Work intervals: Varied by class format; not fully reported.
- Recovery: Varied by class format; not fully reported.
- Intensity: High intensity, scaled individually; objective target not reported.
- 45 min.
- 3 sessions/week prescribed.
- 8 weeks.
- Open-label pilot parallel randomized controlled trial comparing Bikram yoga with an active HIIT comparator.
- Brief Pain Inventory total, Feasibility and completion, Health-related quality of life, and Heart-rate variability were tracked.
Outcomes
Primary pain outcome
There was no between-group difference between Bikram yoga and HIIT on BPI total pain severity/interference.
ANCOVA F(1,29)=0.01, p=0.914.
Pain over time
Pain severity/interference decreased from baseline to 8 weeks across groups.
BPI total 7.94 +/- 3.63 at baseline to 6.75 +/- 3.98 at 8 weeks; F(1,31)=6.29, p=0.018.
Secondary quality-of-life and HRV outcomes
Bikram yoga outperformed HIIT for physical functioning, mental health, and SDNN HRV signals, while most other secondary outcomes did not clearly differ.
SF-36 physical functioning p=0.019; mental health p=0.005; SDNN HRV favored Bikram yoga in reported analyses.
Feasibility
Overall retention was high, but HIIT had lower post-assessment completion and lower average attendance than Bikram yoga.
Completion: Bikram yoga 17/17; HIIT 12/15. Attendance: 1.4 vs 1.2 classes/week.
Safety
No injuries were reported, but some participants stopped attending because the intervention was too intense.
Three women (about 9% of the total sample) stopped attending due to intensity.
Insights
- For users with persistent pain or trauma history, a HIIT class must be easy to start, carefully scaled, and medically screened.
- Track both non-starts and dropouts; complicated enrollment can undermine feasibility before exercise begins.
- This paper should not be used to claim HIIT improves pain, because the active comparator design found no HIIT advantage and lacked a non-exercise control.
Limitations
- Small pilot sample.
- All participants were women with persistent pain and trauma history.
- HIIT protocol was a commercial class with limited objective intensity detail.
- No waitlist or usual-care control group.
- No long-term follow-up.
Safety
- No injuries were reported.
- Three women stopped attending because the intervention was too intense.
- Medical clearance and psychiatric screening were required.