Japanese walking benefits: what the research actually shows
Japanese walking (interval walking training, IWT) has been studied for years at Shinshu University in Japan. Here is what the trials found, with the conditions that matter: who took part, how often they walked and for how long.
Better aerobic fitness
In a randomized study of 246 adults with an average age of 63, people who did interval walking at least four days a week for five months raised their peak aerobic capacity by about 9% (Nemoto et al., Mayo Clinic Proceedings, 2007, PMID 17605959). Aerobic capacity is one of the strongest everyday markers of how fit your heart and lungs are.
Stronger legs
The same study found 13–17% stronger knee extension and flexion after five months. Strong thighs make stairs, getting up from a chair and longer walks easier.
Blood pressure
Systolic blood pressure fell more in the interval walking group than in the group that walked at a steady, moderate pace. The fast phases seem to be what makes the difference.
Larger groups, similar picture
A later study followed 679 people for five months and reported gains in fitness and a lower lifestyle-disease risk score (Masuki et al., Mayo Clinic Proceedings, 2019, PMID 31477320). It had no separate control group, so it supports rather than proves the earlier findings.
A calmer mind
Walking in general helps mood. A 2024 review of 75 randomized trials found fewer symptoms of anxiety and depression in people who walked compared with those who did not (JMIR Public Health and Surveillance, 2024, PMID 39045858). Studies of interval walking itself have not yet shown a specific effect on sleep or mood, so this benefit comes from walking as a whole.
What it takes
- About 30 minutes a session: 3 minutes fast, 3 minutes slow, five times.
- At least four days a week in the studies.
- Five months to see the results above; most people feel the difference in fitness much sooner.
Making it stick
The hardest part of any routine is the fourth week, not the first day. Ayumi counts the intervals and cues every switch, follows the same five-month journey as the study and lets you walk with friends, with a gentle weekly race to keep each other going.
Results vary from person to person. This page is general information, not medical advice; talk to your doctor before starting if you have a heart condition or other health concerns.
Japanese walking: the full guide