Japanese Walking (Interval Walking Training): What the Shinshu University Studies Found
“Japanese walking” sounds like an ancient wellness ritual. It is not. The method behind the viral trend is called interval walking training (IWT), and it was developed in the 2000s by exercise scientists at Shinshu University in Japan as a research protocol for middle-aged and older adults. That origin is good news, not a disappointment: unlike most viral fitness trends, this one has a proper randomized trial behind it. This article explains what the researchers actually tested, what they found, and where the social-media version drifts away from the study.
Quick Answer: Interval walking training alternates 3 minutes of fast walking with 3 minutes of slow walking, repeated for about 30 minutes. In the key 2007 trial of 246 middle-aged and older adults, five months of this pattern improved leg strength and aerobic capacity more than steady-paced walking, and lowered systolic blood pressure by roughly 9 points versus roughly 3. The participants were healthy, previously untrained adults around age 63 — the results describe that group, not everyone.
Where the Method Actually Comes From
Interval walking training was developed by Professor Hiroshi Nose and Dr Shizue Masuki at the Shinshu University Graduate School of Medicine in Matsumoto, Japan. Their starting problem was practical: steady, moderate walking is widely recommended to older adults, but it may not be intense enough to improve aerobic capacity. Athletes had long used interval training — alternating hard and easy efforts — so the team adapted that structure to walking, a low-impact activity older adults could do without a gym.
The method was first described in the scientific literature in 2007 and later introduced to the Japanese public through a health programme for adults over 40. The name “Japanese walking” came much later, from social media. It is also a different idea from the famous 10,000-steps target — which, as our article on whether 10,000 steps a day is based on research explains, began as 1960s pedometer marketing. Interval walking is defined by intensity, not by a step count.
What the Key Study Did and Found
The foundational trial (Nemoto and colleagues, Mayo Clinic Proceedings, 2007) randomly assigned 246 healthy adults — 60 men and 186 women, average age about 63 — to one of three groups for five months:
| Group | What they were asked to do |
|---|---|
| No training | Carry on as usual. |
| Steady walking | Walk at a moderate, continuous pace (about 50% of their peak aerobic capacity), aiming for at least 8,000 steps a day, 4 or more days a week. |
| Interval walking | Alternate 3 minutes fast (at 70% or more of peak aerobic capacity) with 3 minutes slow (about 40%), for at least 5 rounds — roughly 30 minutes — on 4 or more days a week. |
After five months, the interval group improved more than the steady walkers:
- Thigh strength: knee extension up about 13%, knee flexion up about 17%
- Aerobic capacity: up about 8–9%
- Blood pressure: systolic pressure fell by about 9 points in the interval group versus about 3 points in the steady group — a statistically greater reduction
Two honest qualifications belong next to those numbers. First, the participants were previously untrained, so they had the most room to improve; people who already exercise hard should not expect the same size of change. Second, “fast” in this study meant genuinely fast — 70% of peak capacity is a pace where conversation becomes difficult. A gentle stroll with occasional brisk moments is not what was tested.
How This Differs From Ordinary Walking Advice
Most walking guidance is about volume: more steps, more minutes. Interval walking training is about contrast — the same walk contains deliberately hard and deliberately easy segments. That structure is the whole point, and it is also what gets lost when the trend is compressed into “walk like the Japanese for longevity.”
It also differs from our article on walking after meals, which looks at short, gentle walks timed around eating — a different habit, studied for different outcomes (blood sugar and digestion rather than fitness and blood pressure). The two are not competitors; they answer different questions.
Interesting Facts
- The research team later worked with a calf-mounted accelerometer device and remote coaching, because keeping people on the programme turned out to be as important as the programme itself — adherence is the quiet finding behind the headline results.
- Researchers in Denmark later adapted the same interval-walking protocol for studies in people with type 2 diabetes, including a smartphone app (InterWalk) to guide the fast–slow timing.
- Despite the name, nothing in the method is culturally specific: it is exercise physiology — alternating intensity — wearing a geographic nickname it picked up online.
Myths vs Facts
Myth: Japanese walking is an ancient traditional practice.
Fact: It is a 21st-century laboratory protocol, first published in 2007 by Shinshu University researchers. Calling it ancient is trend marketing.
Myth: Any relaxed Japanese-style stroll gives these benefits.
Fact: The trial’s fast intervals were at 70% or more of each person’s peak aerobic capacity. The intensity contrast is the intervention; remove it and you are testing something else.
Myth: It replaces strength training.
Fact: Leg strength improved in the trial, but walking — even fast walking — loads muscles far less than resistance training. The study shows walking can do more than expected, not that it does everything.
Myth: The results apply to everyone.
Fact: Participants were healthy, non-smoking, previously untrained adults aged roughly 44–78, mostly women, with no history of heart or lung disease. Results in other groups are an open question, not a given.
Safety and Suitability Notes
This article describes a research protocol; it is not a personal exercise prescription.
- Walking at 70% of peak capacity is vigorous exercise. Anyone with heart disease, uncontrolled blood pressure, joint problems, or a long period of inactivity behind them should discuss new vigorous exercise with a clinician first — the trial itself screened out people with cardiovascular and lung disease.
- The fast–slow structure can be misjudged without a guide; the study measured intensity directly. Timers and ordinary perceived effort (“fast means I can only say a few words”) are rough substitutes, not equivalents.
- Joint pain, chest symptoms, or unusual breathlessness during any walking programme are stop-and-seek-advice signals, not things to push through.
Frequently Asked Questions
How is Japanese walking different from just walking faster?
It is structured: fixed alternation of fast and slow 3-minute blocks at defined intensities, several days a week, sustained over months. Occasionally speeding up on a normal walk is a step in that direction, but the trial tested the structured version.
Why 3 minutes fast and 3 minutes slow?
That is the protocol the Shinshu team designed and tested — long enough for the fast effort to count as vigorous, short enough for older, untrained adults to repeat it. Other interval patterns exist in exercise science, but the evidence quoted here belongs to this one.
Can it help blood pressure?
In the 2007 trial, systolic pressure fell about 9 points in the interval group over five months — more than with steady walking. That is a research finding in a specific group, not a treatment claim; blood pressure management belongs with your clinician.
Do I need special equipment?
The trial measured intensity with laboratory testing and used pedometers to check activity. The public versions use timers and effort cues. No special clothing, terrain, or “Japanese” technique is part of the method.
Medical Disclaimer
This article is for general information only and is not medical or exercise advice for any individual. FitnTip does not diagnose, treat, or prescribe. The study described was conducted in a screened, healthy population under research conditions; whether a similar programme suits you depends on your own health and history. Please speak with a qualified healthcare professional before starting vigorous exercise, especially if you have a heart, lung, joint, or metabolic condition.
Sources
- Nemoto K, Gen-no H, Masuki S, Okazaki K, Nose H. Effects of high-intensity interval walking training on physical fitness and blood pressure in middle-aged and older people. Mayo Clinic Proceedings, 2007; 82(7): 803–811. PubMed PMID 17605959. https://pubmed.ncbi.nlm.nih.gov/17605959/
- Interval walking training — background and development (Shinshu University; Danish InterWalk adaptation). https://en.wikipedia.org/wiki/Interval_walking_training
This article is for informational and educational purposes only. It does not constitute medical advice, diagnosis, or treatment. The information presented is researched from trusted sources including peer-reviewed scientific journals, CDC, NIH, WHO, and recognized health organizations. Always consult a qualified healthcare professional before making any changes to your diet, exercise routine, or health regimen.
