Postpartum diastasis recti trial tests whether adding core work changes pain and muscle structure
A randomized clinical trial in postpartum women with diastasis recti abdominis is examining whether transcutaneous electrical nerve stimulation can do more than blunt pain. Investigators are pairing TENS with targeted core stabilization exercises to see whether the addition of active rehabilitation improves low back pain, narrows inter-recti distance, and restores transversus abdominis thickness more effectively than stimulation alone.
The clinical question is narrow but highly practical. Postpartum low back pain often emerges in the setting of abdominal wall separation, where the linea alba is stretched and the rectus abdominis no longer functions as a unified stabilizing unit. When that midline support weakens, trunk mechanics can shift, load transfer becomes less efficient, and pain may persist even after delivery-related tissue recovery has begun. In this protocol, investigators are treating the syndrome as both a pain problem and a mechanical control problem.
The study plans to enroll 36 participants and randomize them into two parallel groups. One arm receives TENS alone; the other receives the same stimulation plus abdominal drawing-in, pelvic tilts, heel slides, and bridging exercises. Sessions are scheduled three times per week for six weeks, with stimulation delivered for 20 minutes per visit. The stimulation parameters are fixed at 80 to 100 Hz with a pulse duration of 100 to 150 microseconds, and intensity is adjusted to a comfortable sensory level without muscle contraction.
Pain is only part of the readout. The trial is also measuring inter-recti distance and transversus abdominis thickness, which turns the study into a functional anatomy experiment as much as a pain intervention trial.
Why the exercise arm could outperform stimulation alone
The biological rationale for combining modalities is straightforward. TENS may reduce pain through sensory gating and modulation of nociceptive signaling, making movement more tolerable in the early rehabilitation window. Core stabilization exercises, by contrast, target the abdominal wall itself. Abdominal drawing-in recruits deep trunk musculature, pelvic tilts train pelvic control, heel slides challenge lumbopelvic coordination, and bridging loads the posterior chain while asking the trunk to resist collapse. In a postpartum abdomen with widened inter-recti spacing, those exercises are meant to restore neuromuscular recruitment rather than simply quiet symptoms.
A single sentence captures the clinical gamble: pain relief alone may not rebuild a weakened abdominal wall.
The protocol’s outcome structure reflects that distinction. If pain improves in both groups but the combined arm produces greater gains in inter-recti distance or transversus abdominis thickness, the added value of exercise would be visible not just in symptom suppression but in the underlying mechanics of recovery. If pain falls without a parallel change in abdominal structure, the trial will still have practical value, because it would suggest that short-term symptom control is achievable even when structural remodeling remains incomplete.
Single-blind masking of the outcomes assessor is an important feature here. It reduces the risk that measurement of pain scales, caliper-based assessment, or ultrasound interpretation is influenced by knowledge of treatment assignment. The trial also uses a randomized parallel design, which should help isolate the effect of the rehabilitation package from spontaneous postpartum recovery, although the small planned sample leaves modest room for detecting anything other than clear separation between arms.
Measurements, eligibility, and what the protocol can realistically answer
Eligibility is tightly defined. Participants must be postpartum females aged 21 to 45 years, at least six weeks after delivery, with a diagnosed diastasis recti abdominis, an inter-recti distance of at least 2 cm, and pain intensity of 4 or higher on the Numeric Pain Rating Scale. Women receiving other physiotherapy for DRA are excluded, as are those with recent abdominal surgery, abdominal hernia requiring surgery, pregnancy, neurological disorders affecting trunk muscle function, severe musculoskeletal limitations, or implanted electrical devices that would make TENS inappropriate.
The study site is in Lahore, Punjab Province, Pakistan, and the estimated study completion date is December 31, 2026. The record lists the trial as active but not recruiting. Those details matter because postpartum rehabilitation research often depends on tight eligibility and disciplined follow-up; even small losses to follow-up can dilute an effect when enrollment is only 36 participants.
The primary measurement strategy includes pain intensity plus physical measures of abdominal wall integrity. A digital vernier caliper is listed for one of the outcomes, and musculoskeletal ultrasound is used to assess the inter-recti distance and transversus abdominis thickness at rest and during contraction. Those tools are clinically sensible for this question because they address both symptom burden and tissue behavior. A caliper gives a direct measure of spacing, while ultrasound can capture whether the deep abdominal wall is thickening and activating appropriately under load.
The analysis plan is conventional: paired t-tests for within-group change and independent t-tests for between-group comparison, with p ≤ 0.05 treated as significant. The statistics are not elaborate, but they fit the design. This is a focused rehabilitation study, not an endpoint-rich pharmacologic trial.
One limitation is already visible in the protocol itself. With a six-week intervention window and a relatively small cohort, the study will be better suited to detecting short-term differences in pain and measured abdominal parameters than to proving durable postpartum recovery. Still, if the combined arm shows greater improvement in both function and structure, the result would support a treatment approach that does not stop at analgesia and instead tries to restore the biomechanics that postpartum pain often disrupts.