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Yes, a treadmill can take weight off, and one of the better trials on exercise and weight was run almost entirely on them. In the Midwest Exercise Trial 2, overweight young adults walked or jogged five days a week for ten months and were not asked to diet. Those burning 400 calories a session lost about 3.9 kg on average. Those burning 600 lost about 5.2 kg, which took most of them close to an hour a session.
If you are starting today, walk briskly for 30 minutes on five days, at about 5–6 km/h with the incline at 1–2%. Distance counts for more than speed, so a long walk does as much as a short run. Your knees will tell you when to raise the incline rather than the speed. Expect to feel hungrier, and plan the snack before the session.
Can you lose weight just by using a treadmill?
You can, though the amount surprises people in both directions. The Midwest Exercise Trial 2 is the cleanest test we have. Donnelly and colleagues at the University of Kansas put 141 sedentary, overweight adults on supervised exercise five days a week for ten months. Most sessions were walking or jogging on motorised treadmills, at 70–80% of maximum heart rate.
Nobody was asked to change their diet. The 400-calorie group lost an average of 3.9 kg, or 4.3% of body weight. The 600-calorie group lost 5.2 kg, or 5.7%. The control group, who did no exercise, gained half a kilo over the same months. Men and women did about equally well.
Those averages hide a wide spread. When Herrmann and colleagues went back to the same trial, roughly half the exercisers had lost less than 5% of their weight. The men who fell short ate more and moved less outside their sessions than the men who lost more. So the treadmill does real work, and what happens off the belt decides how much of it shows on the scale.
How many minutes on the treadmill does it take to lose weight?
In 2009 the leading US exercise science body, the ACSM, reviewed the trials. Between 150 and 250 minutes a week of moderate activity mostly prevents weight gain and gives modest loss on its own. Clinically meaningful loss from exercise alone showed up above 250 minutes a week. When diet changes came with the exercise, 150–250 minutes clearly improved the result.
In treadmill terms, 250 minutes is 50 minutes on five days. That is a lot for someone starting from zero, and it is also roughly what the Kansas volunteers were doing by the end of their trial. They began at 150 calories a session and built up over months. One volunteer burning about 9 calories a minute needed 44 minutes to reach 400.
If 50 minutes a day sounds impossible, take the 150-minute floor as the first target. Thirty minutes on five weekdays gets you there. Add ten minutes a session every fortnight while your legs adapt. A long walk outdoors on Sunday counts toward the same weekly total.
Should you walk or run on the treadmill to lose weight?
Walk if you are new, heavy or have sore knees, and run only once walking feels easy. The reason is simple arithmetic. Loftin and colleagues measured the calories adults used to cover one mile, about 1.6 km. Normal-weight walkers used about 94, overweight walkers about 98 and marathon runners about 99. Covering ground costs roughly the same whether you walk it or run it.
Running mainly saves time. Five kilometres takes a brisk walker about an hour and a steady jogger about half that. If your evening has 30 free minutes, jogging intervals will burn more inside it. With an hour free, a brisk walk does the same job with far less strain.
Their equation for one mile is body weight in kg × 0.789, minus 7.634 for a man or 15.268 for a woman, plus 51.1. For Sunita, an illustration who weighs 80 kg, that comes to about 99 calories a mile, or roughly 60 a kilometre. Her 4 km evening walk burns about 240 calories, a little more than a plate of poha. The treadmill screen may show a different figure, so trust the distance more than its calorie count.
Sources: [4]
Does incline walking burn more fat?
Incline mostly lets you work harder at a slower speed, which is useful when your knees are the limit. Ehlen and colleagues tested this in twelve adults with obesity, averaging about 100 kg. They walked on a force-measuring treadmill at different speeds and slopes. Walking slowly up a 6° slope, about a 10% grade on most machines, took the same moderate effort as brisk walking on the flat.
The difference was at the knee. Uphill at 2.7 km/h, peak knee loads fell by roughly a fifth to a quarter compared with flat walking at 5.4 km/h. For a heavier walker with aching knees, that is the more comfortable way to reach the same effort.
The popular 12-3-30 routine, 12% incline at about 4.8 km/h for 30 minutes, is a steeper version of the same idea. It is hard work for a beginner, and holding the rails to cope defeats much of the point. Start at 3–5% incline, add one or two points a week, and drop the speed rather than grab the handrail.
Sources: [5]
Are treadmill intervals better than a steady walk?
For fat loss they come out about even, so pick whichever fits your evening. Wewege and colleagues pooled 13 trials in overweight adults aged 18–45, most lasting ten weeks with three sessions a week. Intervals and steady moderate exercise cut body fat and waist size by similar amounts. The interval groups simply trained for about 40% less time.
There was one detail treadmill owners will like. Running cut whole-body fat clearly with either style of training, while the cycling studies did not show the same effect.
A first interval session takes about 25 minutes. Walk easily for five minutes. Then go fast for one minute, at a pace where talking gets hard, and slow for two. Do that six to eight times and finish with a slow walk. Two interval days a week is enough at the start, with steady walks on the other days. On nights when the office ran late and only half an hour is left, this is the session to choose.
Sources: [6]
Can treadmill walking reduce belly fat?
Yes, and the deep fat around the organs responds faster than the scale suggests. Vissers and colleagues pooled 15 studies of aerobic training in overweight adults who were not dieting. Moderate or vigorous aerobic exercise reduced visceral fat on CT scans within about twelve weeks. In women the area shrank by more than 30 square centimetres, and in men by more than 40.
Ross and colleagues showed how much the method matters. Obese men lost the same 7.5 kg over three months either by dieting or by daily aerobic exercise. Both groups lost belly and visceral fat, and the exercise group lost about 1.3 kg more total fat for the same weight.
This matters more in India. The national consensus on obesity in Asian Indians set lower BMI and waist cut-offs than for white Western adults, because extra fat sits around the belly at lower weights. A tape round the navel each fortnight shows treadmill progress the scale can miss.
Why does the scale stall when you are on the treadmill every day?
Usually because appetite quietly makes up part of the gap. In the E-MECHANIC trial, Martin and colleagues gave 171 adults supervised exercise for 24 weeks and measured intake precisely. The exercisers lost less weight than their sessions predicted, by 1.5 kg in the lighter dose and 2.7 kg in the heavier one. Most of the gap came from eating about 90–120 calories a day more.
That is one extra biscuit packet a day, or a second cup of sweet chai with namkeen after the gym. People rarely notice it. Plan the post-workout snack before you train, and make it protein, such as a bowl of curd, a boiled egg or roasted chana.
Holding the handrails is the other quiet leak. In treadmill fitness testing, Manfre and colleagues found that gripping the front rail let people last longer at the same settings. Their predicted fitness looked higher, because the arms were taking some of the work. Swing your arms instead, and lower the speed or incline until you can manage without the rails.
How do you keep your muscle while losing weight on a treadmill?
Treadmill work protects some muscle, but it builds very little. Willis and colleagues tested this in the STRRIDE AT/RT trial, which ran for eight months in overweight adults. Aerobic training took off the most fat and weight. Only the groups that also lifted weights gained lean mass.
The risk grows once you start eating less as well. Weinheimer's review of 52 studies in adults over 50 counted how much of the weight lost was fat-free mass. In 81% of the diet-only groups, at least 15% of it was. When exercise was added, mostly walking or cycling, that fell to 39% of groups.
At home, twenty minutes twice a week is enough to start. Squat down to a chair and stand up, step onto the bottom stair, push up against the kitchen counter and row a filled water can. Then put a protein food on every plate: dal, paneer, eggs, curd or chicken. Doctors who plan weight loss for people with obesity work the same way when they aim for up to 20% of body weight with the muscle kept. They check protein and strength from the first week, because a scale cannot tell muscle from fat.
A treadmill plan for weight loss at home, week by week
Weeks 1–2: walk 25–30 minutes on five days, at a pace where you can talk in full sentences. Set the incline to 1–2%, which feels closer to walking on a road. Clip on the safety key, and note the distance in your phone each day.
Weeks 3–4: stretch three of the sessions to 40 minutes. On two of them, raise the incline to 4–5% and drop the speed a little if you need to. Add a 20-minute strength session on one day away from the treadmill.
Weeks 5–6: build towards 45–50 minutes on most days, which puts you near 250 minutes a week. If your knees are happy, turn one session into intervals. Add a second strength session.
Every two weeks, check your waist at the navel and your average weight for the week. If both are creeping down, carry on as you are. If neither has moved after six weeks of honest sessions, look at your plate before you add more minutes. Sore knees or shins are a reason to hold the plan for a week.