Study: A 20-Minute Walk Can Kickstart Gut Activity Within Minutes

Scientists at Fujita Health University in Japan have examined how quickly physical activity affects digestion, publishing their findings in the journal Scientific Reports.

Constipation is among the most common digestive complaints, causing bloating, straining and reduced quality of life across age groups. When persistent, it can contribute to complications such as hemorrhoids and added strain on the cardiovascular system. While physical activity has long been recommended as a remedy, little was previously known about what happens inside the gut in the first minutes after movement begins.

How the study worked

The research involved 21 healthy young adults. Each participant first lay still for one minute while an electronic stethoscope and signal-processing software recorded baseline bowel sounds. Participants then walked on a treadmill for 20 minutes at a comfortable pace. Afterward, lying down again, their bowel sounds were recorded at intervals over the following 15 minutes. Researchers tracked three measures: overall sound intensity, the share of time sounds were detected, and the number of distinct sounds per minute.

Quick but short-lived effect

All three measures rose significantly within one to two minutes after the walk ended — sound intensity nearly doubled, and the frequency of detectable sounds increased as well. However, the boost faded within two to three minutes.

Senior author Professor Yohei Otaka said walking can act as an effective, immediate tool for stimulating bowel function, suggesting the effect may stem from changes in autonomic nervous system activity or reflexes triggered by the body's movement. The team believes bowel-sound monitoring could become a useful non-invasive tool for future research into digestive health and constipation treatment.