Glossary

Term · Postpartum: Your Body

inter-recti distance

Also: IRD

The gap between the two sides of the abdominal muscles, measured across the midline. It widens in pregnancy, and it is the measure behind diastasis recti.

In plain words

The inter-recti distance is the space between the left and right sides of the , the muscle pair that runs down the front of the belly. The two sides are joined by a band of tissue called the . In pregnancy, the belly grows, and the band stretches and thins, so the gap widens. Clinicians often measure it by feel, with fingers placed at the belly button, in finger widths or centimeters. A wider gap is called . Most people have some widening in late pregnancy. For many, it narrows over months. For a substantial minority, it stays wider past a year. Width alone does not say how well the core works. A physical therapist can check the gap, the tissue, and how the muscles work together.

The deeper version

Diastasis recti abdominis is an increase in inter-recti distance caused by widening and thinning of the linea alba. It is commonly measured by palpation at the umbilicus, in finger widths or centimeters, and ultrasound is used in research. Separation is common by the third trimester, and it persists beyond one year in a substantial minority of people (Sperstad and colleagues, British Journal of Sports Medicine, 2016). Benjamin and colleagues (Physiotherapy, 2014) reviewed exercise effects on the gap and found limited, low-quality evidence. Whether inter-recti distance predicts pelvic floor symptoms, back pain, or function is debated, and no validated threshold for clinical concern is agreed.

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Sources

  • Sperstad JB et al. — Diastasis recti abdominis during pregnancy and 12 months after childbirth. British Journal of Sports Medicine, 2016
  • Benjamin DR et al. — Effects of exercise on diastasis of the rectus abdominis muscle in the antenatal and postnatal periods: a systematic review. Physiotherapy, 2014

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