Japanese Walking: The Interval Pattern Behind the Trend

“Japanese walking” has spread across social media as a simple way to get more out of a walk: alternate three minutes of brisk walking with three minutes of easy walking. It sounds almost too easy to matter, yet it has real roots in research. The trend and the science are not quite the same thing, so let’s take a friendly look at both. This is general education, not medical advice.

The pattern people mean

The popular version goes like this: warm up, then alternate about three minutes of faster walking with about three minutes of relaxed walking, repeat for around 30 minutes, and do it a few times a week. “Fast” means brisk enough that talking is possible but a little harder. “Easy” means a comfortable stroll that lets your breathing settle. Researchers call the approach interval walking training.

Where it comes from

The idea comes from work by exercise scientists at Shinshu University in Japan. In a 2007 randomized trial in Mayo Clinic Proceedings, Nemoto and colleagues followed 246 middle-aged and older adults (60 men and 186 women, average age about 63) for five months. They were assigned to no training, moderate continuous walking, or interval walking that alternated roughly 70 percent and 40 percent of peak aerobic capacity. The trial aimed to see whether intervals improved thigh strength, aerobic capacity and blood pressure more than steady walking, and the authors concluded that adding bursts of higher intensity gave added benefits.

Later studies

• Larger programs in Japan: a later analysis of 679 adults with a mean age of about 65 reported gains in estimated aerobic fitness and improvements in a combined score of lifestyle-related disease markers after five months, with benefits growing as weekly time at the brisk pace rose before leveling off (as summarized in a review).
• Type 2 diabetes: a small Danish trial of four months, published in Diabetes Care in 2013 by Karstoft and colleagues, compared interval walking with steady walking of the same total energy cost. The interval group improved fitness by about 16 percent and lost about 3 kg of body fat, and blood sugar control improved only in that group.
• Older adults: a trial of 68 adults with an average age of 70 reported that interval walking lowered stiffness in the large arteries more than ordinary walking, though thinking test scores improved about equally.

What is not proven

Most of this research measured fitness, muscle strength and blood pressure, not weight. Viral claims about melting belly fat or giving up other exercise go well beyond it. The studies were also fairly short and mostly in older Japanese adults or small groups, and people who volunteer for exercise trials are often already motivated. Larger, longer trials that look at outcomes like heart attacks have not been done.

Trying it safely

• Start gently. Begin with a few cycles and build up over several weeks.
• Use effort, not speed. The brisk phase should feel like moderate effort. If you cannot speak at all, slow down.
• Choose comfortable shoes and flat, even ground. Hills can be added later.
• Check first if needed. If you have a heart, lung or joint condition, or you are new to exercise, ask a clinician before raising your effort.
• Count it toward your week. Brisk intervals fit within the standard 150 minutes of moderate activity a week.

Where it fits for you

Interval walking is one way to make a walk a little more interesting without adding gear or time. It sits alongside other options we have covered, including how much walking is enough, the 10,000-steps number, the 12-3-30 workout, short walks after meals and exercise snacks. The best pattern is the one you enjoy enough to keep doing.

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 (design and aims from the abstract record; effect sizes were not confirmed against the full text and are not quoted here).
• Karstoft K, Winding K, Knudsen SH, et al. The effects of free-living interval-walking training on glycemic control, body composition, and physical fitness in type 2 diabetic patients. Diabetes Care, 2013 (figures from a review summary).
• Masuki S, Morikawa M, Nose H. Interval walking training in Japan, 2019 analysis of 679 adults, and a 20-week trial in older adults on arterial stiffness and cognition (details from the Interval walking training reference summary; check the original papers for exact figures).
• U.S. Department of Health and Human Services. Physical Activity Guidelines for Americans, 2nd edition (150 minutes of moderate activity a week).